Heat transfer compositions, methods and systems

Abstract

Disclosed are refrigerants comprising at least about 97% by weight of a blend of three compounds, said blend consisting of: from about 38% by weight to about 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41 % by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf) wherein the percentages are based on the total weight of the three compounds in the blend, and methods and systems which use same.

Description

DEMANDE OU BREVET VOLUMINEUX LA PRÉSENTE PARTIE DE CETTE DEMANDE OU CE BREVET COMPREND PLUS D'UN TOME. CECI EST LE TOME 1 DE 2 CONTENANT LES PAGES 1 À 204 NOTE: Pour les tomes additionels, veuillez contacter le Bureau canadien des brevets JUMBO APPLICATIONS / PATENTS THIS SECTION OF THE APPLICATION / PATENT CONTAINS MORE THAN ONE VOLUME THIS IS VOLUME 1 OF 2 CONTAINING PAGES 1 TO 204 NOTE: For additional volumes, please contact the Canadian Patent Office NOM DU FICHIER / FILE NAME : NOTE POUR LE TOME / VOLUME NOTE: HEAT TRANSFER COMPOSITIONS, METHODS AND SYSTEMS Cross Reference to Related Applications The present invention is related to and claims the priority benefit of US Provisional Application No. 62 / 368,537, filed July 29, 2016. Field of the Invention The present invention relates to compositions, methods and systems having utility in heat exchange systems, including air conditioning and refrigeration applications and in particular aspects to compositions useful in heat transfer systems of the type in which the refrigerant R-104A would have heretofore been used, that is as a replacement of the refrigerant R410A for heating and cooling applications and to retrofitting heat exchange systems, including systems designed for use with R410A. Background Mechanical refrigeration systems, and related heat transfer devices, such as heat pumps and air conditioners, using refrigerant liquids are well known in the art for industrial, commercial and domestic uses. Chlorofluorocarbons (CFCs) were developed in the 1930s as refrigerants for such systems. However, since the 1980s the effect of CFCs on the stratospheric ozone layer has become the focus of much attention. In 1987, a number of governments signed the Montreal Protocol to protect the global environment, setting forth a timetable for phasing out the CFC products. CFCs were replaced with more environmentally acceptable materials that contain hydrogen, namely the hydrochlorofluorocarbons (HCFCs). One of the most commonly used hydrochlorofluorocarbon refrigerants was chlorodifluoromethane (HCFC-22). However, subsequent amendments to the Montreal protocol accelerated the phase out of the CFCs and also scheduled the phase-out of HCFCs, including HCFC-22. In response to the requirement for a non-flammable, non-toxic alternative to the CFCs and HCFCs, industry has developed a number of hydrofluorocarbons (HFCs) which have zero ozone depletion potential. R410A (a 50:50 w / w blend of difluoromethane (HFC-32) and pentafluoroethane (HFC-125)) was adopted as the industry replacement for HCFC-22 in air conditioning and chiller applications as it does not contribute to ozone depletion. However, R410A is not a drop-in replacement for R22. Thus, the replacement of R-22 with R-410A required the redesign of major components within heat exchange systems, including the replacement and redesign of the compressor to accommodate the higher operating pressure and volumetric capacity of R410A, when compared with R-22. While R-410A has a more acceptable Ozone Depleting Potential (ODP) than R-22, the continued use of R-410A is problematic, due to it's high Global Warming Potential of 2088. There is therefore a need in the art for the replacement of R-410A with a more environmentally acceptable alternative. It is understood in the art that it is highly desirable for a replacement heat transfer fluid to possess a difficult-to-achieve mosaic of properties, including excellent heat transfer properties, , and in particular heat transfer properties that are well matched to the needs of the particular application, chemical stability, low or no toxicity, non-flammability and / or lubricant miscibility and / or lubricant compatibility amongst others. In addition, any replacement for R410A would ideally be a good match for the operating conditions of R410A in order to avoid modification or redesign of the system. The development of a of a heat transfer fluid meeting all of these requirements, many of which are unpredictable, is a signifigant challenge. With regard to efficiency and use, it is important to note that a loss of refrigerant thermodynamic performance or energy efficiency may result in an increase in fossil fuel usage as a result of the increased demand for electrical energy. The use of such a refrigerant will therefore have a negative secondary environmental impact. Flammability is considered to be an important, and in some cases, an essential property for many heat transfer applications Thus, it is frequently beneficial to use compounds in such compositions, which are non-flammable. As used herein, the term "non-flammable" refers to compositions which are determined to be non-flammable in accordance with ASTM E681- 2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. It is critical for maintenance of system efficiency, and proper and reliable functioning of the compressor, that lubricant circulating in a vapour compression heat transfer system is returned to the compressor to perform its intended lubricating function. Otherwise, lubricant might accumulate and become lodged in the coils and piping of the system, including in the heat transfer components. Furthermore, when lubricant accumulates on the inner surfaces of the evaporator, it lowers the heat exchange efficiency of the evaporator, and thereby reduces the efficiency of the system. R-410A is currently used with polyol ester (POE) lubricating oil in air conditioning applications, as R-410A is miscible with POE at temperatures experienced during use of such systems. However, R-410A is immiscible with POE at temperatures typically experienced during operation of low temperature refrigeration systems, and heat pump systems. Therefore, unless steps are taken to mitigate against this immisicibility, POE and R-410A cannot be used in low temperature refrigeration or heat pump systems. It is therefore desirable to be able to provide compositions which are capable of being used as a replacement for R-410A in air conditioning applications. It is an additional benefit to be able to use the compositions of the invention in for example heat pump and low temperature refrigeration systems, but which do not suffer the drawback of immiscibility with POE at temperatures experienced during operation of these systems. The present invention provides a refrigerant which can be used as a replacement for R410A and which exhibits the desired mosaic of properties of excellent heat transfer properties, chemical stability, low or no toxicity, non-flammability, lubricant miscibility and / or lubricant miscibility in combination with an acceptable Global Warming Potential (GWP). US Patent Application 2006 / 0243945 describes numerous heat transfer compositions as potential replacements for several refrigerants previously used in various applications. Among the compositors disclosed are several compositions comprising the HFC-32, HFC- 125, HFO-1234yf and trifluroroiodomethane (CF3I) (see Table 11, 5th from the last through 11th from the last entries in the table). However, none of the compositons that has all four of these components has an amount of HFC-32 that is less than 50 wt%. In addition, all of the compositions disclosed have an amount of HFC-125 that is 10% or less. Applicants have unexpectedly found, as explained hereinafter, that the formulation of a refrigerant compositon from these four components is capable of achieving an important and highly desirable combination of properties, provided that the components are present in specific amounts and / or relative ratios. However, none of compostions disclosed in the '945 publication contain the amounts of these four components as required by the preferred aspects of the present invention and / or the important weight ratios as described herein that are needed to achieve one or more of the unexpected properties achieved according to the preferred aspects of the invention as described herein. U.S. 2013 / 0119299 discloses refrigerant compositons based on three components: (i) a first component selected from trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)), cis-1,3,3,3- tetrafluoropropene (R-1234ze(Z)) and mixtures thereof; (ii) carbon dioxide (CO2 or R-744); and (iii) a third component selected from difluoromethane (R-32), 1,1,1,2-tetrafluoroethane (R-134a), and mixtures thereof. This application discloses that the R-1234ze must be present in the compositions in an amount of at least about 5% by weight, that the CO2 is preferably present in an amount of from about 4% by weight to about 30 by weight, and that when the third component is R-32 it is present in an amount of from 5% by weight to less than 30% by weight. The application indicates that additional compounds can be included, such as 2,3,3,3- tetrafluoropropene (R-1234yf), 3,3,3-trifluoropropene (R1243zf), 1,1-difluoroethane (R-152a), fluoroethane (R-161), 1,1,1-trifluoropropane (R-263fb), 1,1,1,2,3-pentafluoropropane (R-245eb), propylene (R-1270), propane (R-290), n-butane (R-600), isobutane (R-600a), ammonia (R-717) and mixtures thereof. This application also discloses that the refrigerant R-125 may also be included but does not disclose the use of any particular amount. This application also discloses the possible use of a fire retarding agent selected from the group consisting of tri-(2-chloroethyl)- phosphate, (chloropropyl)phosphate, tri-(2,3-dibromopropyl)-phosphate, tri-(1,3-dichloropropyl)- phosphate, diammonium phosphate, various halogenated aromatic compounds, antimony oxide, aluminium trihydrate, polyvinyl chloride, a fluorinated iodocarbon, a fluorinated bromocarbon, trifluoro iodomethane, perfluoroalkyl amines, bromo-fluoroalkyl amines and mixtures thereof. Although this application also indicates that the disclosed compositions are useful as low GWP replacements for a number of existing refrigerants, such as R-134a, R-152a, R-1234yf, R-22, R- 410A, R-407A, R-407B, R-407C, R507 and R-404a, it does not identify any particular composition for specific use as a replacement for R-410a. Summary Applicants have unexpectedly found that refrigerant compositions comprising components in the relative amounts and / or relative ratios according to the present invention overcome one or more of the disadvantages of prior refrigerants described herein and / or achieve an unexpected combination of results that are not achieved according to any of the compositions described above, including results in particular heat transfer systems and heat transfer methods. According to the present invention, there is provided a refrigerant comprsing: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant comprises at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant comprises at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant comprises at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Applicants have found that it is highly preferred for the refrigerant compositions of the present invention to utilize one or more, and preferably all, of the following component weight ratios in order to achieve highly advantageous and unexpected advantages: (a) weight ratio of (HFC-32 + HFO-1234yf):(CF3I + HFC-125) from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1; and (b) weight ratio of HFC-32:HFC-125 from greater than 3.5:1 to about 4:1, preferably from about 3.8:1 to about 3.9:1. For the purposes of convenience, the weight ratio of (HFC-32 + HFO-1234yf):(CF31 + HFC-125) is referred to herein as "HFC32HFO1234yf:CF3IHFC125 ratio." For the purposes of convenience, the weight ratio of HFC-32:HFC-125) is referred to herein as "HFC32f:HFC125 ratio." Thus, according to the present invention, there is provided a refrigerant comprsing: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant comprises at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant comprises at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant comprises at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (i) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (ii) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. For all of the refrigerant compositions disclosed herein, it is preferred that the weight ratio of the total of the HFC-32 in the composition to the HFC-125 in composition is greater than 3.5:1 and less than 5:1, and even more preferably from greater than 3.7:1 and less than 4.5:1, with a ratio of about 4:1 being highly preferred, with the HFC32:HFC125 ratio even more preferably being about 4:1. For all of the refrigerant compositions disclosed herein, it is preferred that the HFC32HFO1234y:CF3IHFC125 ratio is from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1, with a ratio of about 1.17:1 being highly preferred. For all of the refrigerant compositions disclosed herein, it is preferred that the weight ratio of the HFC-32 in the composition to the CF3I in composition is greater than 1.25:1 and less than 1.4:1, and even more preferably from greater than 1.3:1 and less than 1.4:1, with a ratio of about 1.34:1 being highly preferred. One unexpected result achieved by the preferred embodiments of the present invention is the unexpected ability of the compositions to achieve at once a highly desirably combination of properties. In particular, the compositions of present invention which use one or more of the ratios identified herein in conjunction with the amounts of the components specified herein one or both of, and preferably both of, the following properties: (a) non-flammability as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; and (b) global warming potential (GWP) of less than 750. According to the present invention, there is provided a refrigerant comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). According to the present invention, there is provided a refrigerant comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). According to the present invention, there is provided a refrigerant comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). According to the present invention, there is provided a refrigerant comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. According to the present invention, there is provided a refrigerant comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. According to the present invention, there is provided a refrigerant comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant consists essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant consists essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant consists essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant consists essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant consists essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant consists essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant consists essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant consists essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant consists essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. According to the present invention, there is provided a refrigerant that consists essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). According to the present invention, there is provided a refrigerant consists essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). According to the present invention, there is provided a refrigerant consists essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). According to the present invention, there is provided a refrigerant that consists essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. According to the present invention, there is provided a refrigerant consists essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. According to the present invention, there is provided a refrigerant consists essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following three compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. Preferably, the refrigerant comprises at least about 97% by weight of the following four compounds, with the following percentages being based on the total weight of the following four compounds: : about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Preferably, the refrigerant comprises at least about 98.5% by weight of the following four compounds, with the following percentages being based on the total weight of the following four compounds: : about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant comprises at least about 99.5% by weight of the following four compounds, with the following percentages being based on the total weight of the following four compounds: : about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Preferably, the refrigerant consists essentially of at least about 97% by weight of the following four compounds, with the following percentages being based on the total weight of the following four compounds: : about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Preferably, the refrigerant consists essentially of at least about 98.5% by weight of the following four compounds, with the following percentages being based on the total weight of the following four compounds: : about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant consists essentially of at least about 99.5% by weight of the following four compounds, with the following percentages being based on the total weight of the following four compounds:: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Applicants have found that the preferred refrigerants of the present invention, as described above and hereinafter, are capable of providing exceptionally advantageous properties in connection with a combination of two or more of heat transfer properties, chemical stability, low or no toxicity, non-flammability and / or lubricant compatibility in combination with an acceptable Global Warming Potential (GWP), especially in connection with use as a replacement for R-410A. Preferably, the refrigerant consists essentially of from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), Preferably, the refrigerant consists essentially of from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), Preferably, the refrigerant consists essentially of from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. More preferably, the refrigerant consists essentially of: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Thus, the refrigerant of the present invention consists essentially of from about 38% by weight to 48% by weight difluoromethane (HFC-32), preferably about 46% by weight to 48% by weight difluoromethane (HFC-32), more preferably about 47% by weight difluoromethane (HFC-32). In addition, the refrigerant consists essentially of from about 6% by weight to about 12 % by weight pentafluoroethane (HFC-125), preferably about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), more preferably about 12% by weight pentafluoroethane. In addition, the refrigerant consists essentially of from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I), preferably about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I), more preferably about 35 wt% trifluoroiodomethane (CF3I). In addition, the refrigerant consists essentially of from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), preferably from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), more preferably about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Preferably, the refrigerant consists of from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). More preferably, the refrigerant consists of: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Preferably, the refrigerant consists of from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1... More preferably, the refrigerant consists of: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. For the purposes of this invention, the term "about", in relation to amounts expressed in weight percent, means that the amount of the component can vary by an amount of + / - 2% by weight, preferably + / - 1% by weight, more preferably + / - 0.5% by weight. For the purposes of this invention, the term "about", in relation to the HFC32HFO1234yf:CF3IHFC125 ratio means that the value can vary by an amount of + / - <semantics>0.01<annotation encoding="application / x-tex">0.01< / annotation>< / semantics>, preferably + / - <semantics>0.005<annotation encoding="application / x-tex">0.005< / annotation>< / semantics>. For the purposes of this invention, the term "about", in relation to the HFC32:HFC125 ratio means that the value can vary by an amount of <semantics>±<annotation encoding="application / x-tex">\pm< / annotation>< / semantics>0.1, preferably <semantics>±<annotation encoding="application / x-tex">\pm< / annotation>< / semantics>0.05. The term "about", in relation to temperatures, means that the stated temperature can vary by an amount of + / - 5°C, preferably + / - 2°C and more preferably + / - 1°C, most preferably + / - 0.5°C. A particular advantage of the refrigerants of the present invention is that they are non- flammable when tested in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Flammability is defined as the ability of a composition to ignite and / or propagate a flame. It will be appreciated by the skilled person that the flammability of a refrigerant is an important characteristic for use in heat transfer applications. Thus, it is a desire in the art to provide a refrigerant composition which can be used as a replacement for R410A which has excellent heat transfer properties, chemical stability, low or no toxicity, lubricant miscibility and / or lubricant compatibility and which maintains nonflammability in use. This requirement is met by the refrigerants of the present invention. The refrigerant can be incorporated into a heat transfer composition. Thus, there is provided heat transfer compositions methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: * from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists of:consists of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists of: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Thus, there is provided heat transfer compositions methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists of: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; and (b) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists of about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; and (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; and (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; and (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; and (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; and (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013. Such refrigerant consists essentially of: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; (d) produces in the system and / or the methods a compressor discharge temperature that is not greater than 10°C higher than that of R-410A; and (e) produces in the system and / or the methods a compressor pressure ratio that is from about 95% to about 105% of the compressor pressure ratio of R-410A. Such refrigerant consists essentially of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; (d) produces in the system and / or the methods a compressor discharge temperature that is not greater than 10°C higher than that of R-410A; and (e) produces in the system and / or the methods a compressor pressure ratio that is from about 95% to about 105% of the compressor pressure ratio of R-410A. Such refrigerant consists essentially of: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; (d) produces in the system and / or the methods a compressor discharge temperature that is not greater than 10°C higher than that of R-410A; and (e) produces in the system and / or the methods a compressor pressure ratio that is from about 95% to about 105% of the compressor pressure ratio of R-410A. Such refrigerant consists essentially of: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; (d) produces in the system and / or the methods a compressor discharge temperature that is not greater than 10°C higher than that of R-410A; and (e) produces in the system and / or the methods a compressor pressure ratio that is from about 95% to about 105% of the compressor pressure ratio of R-410A. Such refrigerant consists essentially of: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1. There is provided heat transfer compositions, methods and systems which utilize in a heat transfer system that is useful with the refrigerant R-410A a refrigerant that has the important characteristic of at once providing in said system and / or in connection with said methods a refrigerant that: (a) has an efficiency (COP) from about 95% to about 105%, preferably about 100% to about 105% of the efficiency of R410A in said system and / or used in said method; (b) has a capacity from about 95% to about 105%, preferably about 98% to about 105% of the capacity of R410A in said system and / or used in said method; (c) is non-flammable as determined in accordance with ASTM E681-2009 test procedure as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; (d) produces in the system and / or the methods a compressor discharge temperature that is not greater than 10°C higher than that of R-410A; and (e) produces in the system and / or the methods a compressor pressure ratio that is from about 95% to about 105% of the compressor pressure ratio of R-410A. Such refrigerant consists essentially of: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf). Preferably, the heat transfer composition comprises the refrigerant in an amount of greater than about 40% by weight of the heat transfer composition, or greater than about 50% by weight of the heat transfer composition, or greater than about 70% by weight of the heat transfer composition, or greater than about 80% by weight or greater than about 90% by weight. The heat transfer composition may consist essentially of the refrigerant. The heat transfer compositions of the invention may include other components for the purpose of enhancing or providing certain functionality to the compositions. Such other components or additives may include one or more of lubricants, dyes, solubilizing agents, compatibilizers, stabilizers, antioxidants, corrosion inhibitors, extreme pressure additives and anti-wear additives. The heat transfer composition of the invention particularly comprises a refrigerant as discussed above and a stabilizer. Examples of preferred stabilizers include diene-based compounds and / or phenol-based compounds and / or phosphorus compounds and / or nitrogen compounds and / or epoxides selected from the group consisting of aromatic epoxides, alkyl epoxides, alkyenyl epoxides. The stabilizer preferably is provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5 % by weight, preferably about 0.01% by weight to about 2% by weight, more preferably from about 0.1 to about 1% by weight. In each case, by weight refers to the weight of the heat transfer composition. The diene-based compounds include C3 to C15 dienes and to compounds formed by reaction of any two or more C3 to C4 dienes. Preferably, the diene based compounds are selected from the group consisting of allyl ethers, propadiene, butadiene, isoprene and terpenes. The diene-based compounds are preferably terpenes, which include but are not limited to terebene, retinal, geranoil, terpinene, delta-3 carene, terpinolene, phellandrene, fenchene, myrcene, farnesene, pinene, nerol, citral, camphor, menthol, limonene, nerolidol, phytol, carnosic acid and vitamin A1. Preferably, the stabilizer is farnesene. Preferred terpene stabilizers are disclosed in US Provisional Patent Application No. 60 / 638,003 filed on December 12, 2004. The diene based compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 10 % by weight, preferably about 0.01% by weight to about 5% by weight more preferably from about 0.1 to about 2.5% by weight, and even more preferably from about 1 to about 2.5% by weight. In each case, by weight refers to the weight of the heat transfer composition. The diene based compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5% by weight, preferably about 0.01% by weight to about 2% by weight, more preferably from about 0.1 to about 1% by weight. In each case, by weight refers to the weight of the heat transfer composition. The diene based compounds are preferably provided in combination with a phosphorous compound The phosphorus compound can be a phosphite or a phosphate compound. For the purposes of this invention, the phosphite compound can be a diaryl, dialkyl, triaryl and / or trialkyl phosphite, in particular one or more compounds selected from hindered phosphites, tris-(di-tert-butylphenyl)phosphite, di-n-octyl phophite, iso-decyl diphenyl phosphite, triphenyl phosphite and diphenyl phosphite, particularly diphenyl phosphite. The phosphate compounds can be a triaryl phosphate, trialkyl phosphate, alkyl mono acid phosphate, aryl diacid phosphate, amine phosphate, preferably triaryl phosphate and / or a trialkyl phosphate, particularly tri-n-butyl phosphate. Preferably the stabilizer comprises farnesene and diphenyl phosphite. The phosphorus compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 10 % by weight, more preferably about 0.01% by weight to about 5% by weight and even more preferably from about 0.1 to about 2.5% by weight, and even more preferably from about 1 to about 2.5% by weight. In each case, by weight refers to weight of the heat transfer composition. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. The heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a terpene and a phosphorus compound. The phosphorus compound is preferably selected from a phosphate or a phosphite. Preferably, the stabilizer composition comprises a terpene and a phosphite, more preferably farnesene and diphenyl phosphite. Preferably, the heat transfer composition comprises a refrigerant as set out above and a stabilizer composition comprising farnesene and a phosphorous compound selected from a diaryl phosphite, a dialkyl phosphite, a triaryl phosphate or a trialkyl phosphate, more preferably diphenyl phosphite and / or tri-n-butyl phosphate. More preferably the heat transfer composition comprises a refrigerant as described herein and a stabilizer composition comprising farnesene and one or more of a diaryl phosphite or a dialkyl phosphite, more preferably diphenyl phosphite. Alternatively or in addition, the stabilizer is a nitrogen compound. For the purposes of this invention, the nitrogen compound can be one or more compounds selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, and TEMPO [(2,2,6,6- tetramethylpiperidin-1-yl)oxyl]. Preferably, the stabilizer is dinitrobenzene. Alternatively or in addition, the nitrogen compound comprises an amine based compound. For the purposes of this invention, the amine based compound can be one or more secondary or tertiary amines selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine. For the purposes of this invention, the amine based compound can be an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, particularly one or more amine antioxidants selected from 2,2,6,6-tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis- (1,2,2,6,6-pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc). For the purposes of this invention, the amine based compound can be an alkyldiphenyl amine such as bis (nonylphenyl amine) or a dialkylamine such as (N-(1-methylethyl)-2-propylamine. Alternatively or in addition, the amine based compound can be one or more of phenyl-alpha- naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine. Preferably the amine based compound is one or more of phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha-naphthyl amine (PANA). The nitrogen compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 10 % by weight, preferably about 0.01% by weight to about 5% by weight, more preferably from about 0.1 to about 2.5% by weight, and even more preferably from about 1 to about 2.5% by weight. In each case, by weight refers to weight of the heat transfer composition. In addition, the nitrogen compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5% by weight, preferably about 0.01% by weight to about 2% by weight, more preferably from about 0.1 to about 1% by weight. In each case, by weight refers to weight of the heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the nitrogen compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5% by weight, preferably about 0.01% by weight to about 2% by weight, more preferably from about 0.1 to about 1% by weight. In each case, by weight refers to weight of the heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants refrigerants consisting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants refrigerants consisting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants refrigerants consisting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants refrigerants consisting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consist of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight diffuoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a nitrogen compound selected from dinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1- yl)oxyl], a secondary or tertiary amine selected from diphenylamine, p-phenylenediamine, triethylamine, tributylamine, diisopropylamine, triisopropylamine and triisobutylamine; an amine antioxidant such as a substituted piperidine compound, i.e. a derivative of an alkyl- substituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl, selected from 2,2,6,6- tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6- pentamethylpiperidyl)sebacate; di(2,2,6,6-tetramethyl-4-piperidyl)sebacate, poly(N- hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate; alkylated paraphenylenediamines such as N-phenyl-N'-(1,3-dimethyl-butyl)-p-phenylenediamine or N,N'-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallow amines, methyl bis tallow amine and bis tallow amine, or phenol-alpha-napththylamine or Tinuvin ® 765 (Ciba), BLS ® 1944 (Mayzo Inc) and BLS ® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis (nonylphenyl amine), a dialkylamine such as (N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine, preferably phenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha- naphthyl-amine (APANA) and bis (nonylphenyl) amine, more preferably phenyl-alpha- naphthyl amine (PANA). Alternatively or in addition, the stabilizer comprises a phenol, preferably a hindered phenol. For the purposes of this invention, the phenol can be one or more compounds selected from 4,4'-methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT The phenol compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5 % by weight, preferably about 0.01% by weight to about 2% by weight, more preferably from about 0.1 to 1% by weight. In each case, by weight refers to weight of the heat transfer composition. Alternatively, the phenol compounds can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5 % by weight, preferably about 0.005% by weight to about 2% by weight, more preferably from about 0.01 to 1% by weight. In each case, by weight refers to weight of the heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight diffuoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol; 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a phenol compound selected from 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT. Alternatively or in addition, the stabilizer comprises a phenol, preferably a hindered phenol. For the purposes of this invention, the phenol can be one or more compounds selected from 4,4'-methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols, including 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4- biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6- tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6- di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6- dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4- methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di- tert-alpha-dimethylamino-p-cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert-butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'- thiobis(4-methyl-6-tert-butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl- 4,4'-methylenediphenol and t-butyl hydroquinone, preferably BHT The BHT can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5 % by weight, preferably about 0.01% by weight to about 2% by weight, more preferably from about 0.1 to 1% by weight. In each case, by weight refers to weight of the heat transfer composition. Alternatively, the BHT can be provided in the heat transfer composition in an amount of from about 0.001% by weight to about 5 % by weight, preferably about 0.005% by weight to about 2% by weight, more preferably from about 0.01 to 1% by weight. In each case, by weight refers to weight of the heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising a BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising BHT, in an amount of from about 0.001 % by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO- 1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf: CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO- 1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf: CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farmesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 38% by weight to 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO- 1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf: CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF31HFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition comprising farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants comprising at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting essentially of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: from about 46% by weight to 48% by weight difluoromethane (HFC-32), from about 11% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 34% by weight to about 36% by weight trifluoroiodomethane (CF3I) and from about 5% by weight to about 7% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein said refrigerant composition has: (a) a HFC32HFO1234yf:CF3IHFC125 ratio of from greater than about 1:1 to less than 1.2:1, preferably from greater than about 1.1:1 to about 1.18:1 and (b) an HFC32:HFC125 ratio of from greater than 3.5:1 to about 4:1, and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants conisiting of at least about 97% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 98.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer composition. In addition, the heat transfer composition of the invention comprises a refrigerant according to any one of the refrigerants described here, but preferably those refrigerants consisiting of at least about 99.5% by weight of a blend of the following four compounds, with the following percentages being based on the total weight of the following four compounds: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I) and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a stabilizer composition consisting essentially of farnesene, diphenyl phosphite and / or BHT, wherein the farnesene is provided in an amount of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition, the diphenyl phosphite is provided in an amount of of from about 0.001% by weight to about 5% by weight based on the weight of the heat transfer composition and the BHT is provided in an amount of from about 0.001% by weight to about 5 % by weight based on the weight of heat transfer comp...

Claims

<pat:ClaimStatement>CLAIMS< / pat:ClaimStatement> <pat:Claims com:id="claims"> <pat:Claim com:id="CLM-00001"> <pat:ClaimNumber>1< / pat:ClaimNumber> <pat:ClaimText>1. A refrigerant comprising at least 99.5% by weight of a blend of three compounds, said blend consisting of: about 47% by weight difluoromethane (HFC-32), about 12% by weight pentafluoroethane (HFC-125), about 35% by weight trifluoroiodomethane (CF3I), and about 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the percentages are based on the total weight of the three compounds in the blend and about means + / - 0.5% by weight. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00002"> <pat:ClaimNumber>2< / pat:ClaimNumber> <pat:ClaimText>2. The refrigerant of claim 1, wherein said blend consists of: 47% by weight difluoromethane (HFC-32), 12% by weight pentafluoroethane (HFC-125), 35% by weight trifluoroiodomethane (CF3I), and 6% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the percentages are based on the total weight of the three compounds in the blend < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00003"> <pat:ClaimNumber>3< / pat:ClaimNumber> <pat:ClaimText>3. The refrigerant of claim 1 or 2, wherein the refrigerant consists essentially of said blend. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00004"> <pat:ClaimNumber>4< / pat:ClaimNumber> <pat:ClaimText>4. The refrigerant of claim 1 or 2, wherein the refrigerant consists of said blend. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00005"> <pat:ClaimNumber>5< / pat:ClaimNumber> <pat:ClaimText>5. A heat transfer composition comprising the refrigerant as claimed in any one of claims 1 to 4. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00006"> <pat:ClaimNumber>6< / pat:ClaimNumber> <pat:ClaimText>6. The heat transfer composition as claimed in claim 5, wherein the refrigerant comprises greater than 40% by weight of the heat transfer composition. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00007"> <pat:ClaimNumber>7< / pat:ClaimNumber> <pat:ClaimText>7. The heat transfer composition of claim 5 or 6, further comprising a stabilizer comprising: a diene based compound, a diene based compound and a phosphorous compound, a nitrogen compound, a phenol compound or a combination thereof. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00008"> <pat:ClaimNumber>8< / pat:ClaimNumber> <pat:ClaimText>8. The heat transfer composition of claim 7, wherein the diene based compound is a terpene selected from the group consisting of terebene, retinal, geraniol, terpinene, delta-3 carene, terpinolene, phellandrene, fenchene, myrcene, farnesene, pinene, nerol, citral, camphor, menthol, limonene, nerolidol, phytol, carnosic acid and vitamin A1. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00009"> <pat:ClaimNumber>9< / pat:ClaimNumber> <pat:ClaimText>9. The heat transfer composition of claim 7 or 8, wherein the diene based compound is farnesene. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00010"> <pat:ClaimNumber>10< / pat:ClaimNumber> <pat:ClaimText>10. The heat transfer composition of any one of claims 7 to 9, wherein the diene based compound is provided in the heat transfer composition in an amount from 0.001% by weight to 5 % by weight. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00011"> <pat:ClaimNumber>11< / pat:ClaimNumber> <pat:ClaimText>11. The heat transfer composition of any one of claims 7 to 10, wherein the diene based compound is provided in the heat transfer composition in an amount from 0.01% by weight to 2% by weight. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00012"> <pat:ClaimNumber>12< / pat:ClaimNumber> <pat:ClaimText>12. The heat transfer composition of any one of claims 7 to 11, wherein the diene based compound is provided in the heat transfer composition in an amount from 0.1 to 1% by weight. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00013"> <pat:ClaimNumber>13< / pat:ClaimNumber> <pat:ClaimText>13. The heat transfer composition of any one of claims 7 to 12, wherein the phenol compound is one or more compounds selected from the group consisting of 4,4'- methylenebis(2,6-di-tert-butylphenol); 4,4'-bis(2,6-di-tert-butylphenol); 2,2- or 4,4- biphenyldiols; 4,4'-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or 4,4-biphenyldiols; 2,2'-methylenebis(4-ethyl-6-tertbutylphenol); 2,2'-methylenebis(4-methyl-6-tert-butylphenol); 4,4-butylidenebis(3-methyl-6-tert-butylphenol); 4,4-isopropylidenebis(2,6-di-tert-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6-dimethylphenol); 2,2'- methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di- tert-butyl-4-ethylphenol: 2,4-dimethyl-6-tert-butylphenol; 2,6-di-tert-alpha-dimethylamino-p- cresol; 2,6-di-tert-butyl-4(N,N'-dimethylaminomethylphenol); 4,4'-thiobis(2-methyl-6-tert- butylphenol); 4,4'-thiobis(3-methyl-6-tert-butylphenol); 2,2'-thiobis(4-methyl-6-tert- butylphenol); bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis (3,5-di-tert-butyl-4- hydroxybenzyl)sulfide, tocopherol, hydroquinone, 2,2'6,6'-tetra-tert-butyl-4,4'- methylenediphenol and t-butyl hydroquinone. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00014"> <pat:ClaimNumber>14< / pat:ClaimNumber> <pat:ClaimText>14. The heat transfer composition of any one of claims 7 to 13, wherein the phenol compound is 2,6-di-tert-butyl-4-methylphenol (BHT). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00015"> <pat:ClaimNumber>15< / pat:ClaimNumber> <pat:ClaimText>15. The heat transfer composition of any one of claims 7 to 14, wherein the phenol compound is provided in the heat transfer composition in an amount of from 0.001% by weight to 5 % by weight. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00016"> <pat:ClaimNumber>16< / pat:ClaimNumber> <pat:ClaimText>16. The heat transfer composition of any one of claims 7 to 15, wherein the phenol compound is provided in the heat transfer composition in an amount of from 0.01% by weight to 2% by weight. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00017"> <pat:ClaimNumber>17< / pat:ClaimNumber> <pat:ClaimText>17. The heat transfer composition of any one of claims 7 to 16, wherein the phenol compound is provided in the heat transfer composition in an amount of from 0.1 to 1% by weight. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00018"> <pat:ClaimNumber>18< / pat:ClaimNumber> <pat:ClaimText>18. The heat transfer composition of any one of claims 5 to 17, further comprising a lubricant selected from the group consisting of polyol esters (POEs), polyalkylene glycols (PAGs), PAG oils, silicone oils, mineral oil, alkylbenzenes (ABs), polyvinyl ethers (PVE) and poly(alpha-olefin) (PAO). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00019"> <pat:ClaimNumber>19< / pat:ClaimNumber> <pat:ClaimText>19. The heat transfer composition of claim 18, wherein the lubricant is a polyol ester (POE). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00020"> <pat:ClaimNumber>20< / pat:ClaimNumber> <pat:ClaimText>20. The heat transfer composition of claim 18, wherein the lubricant is a polyvinyl ether (PVE). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00021"> <pat:ClaimNumber>21< / pat:ClaimNumber> <pat:ClaimText>21. The heat transfer composition of any one of claims 5 to 20, having a Global Warming Potential (GWP) of not greater than 750. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00022"> <pat:ClaimNumber>22< / pat:ClaimNumber> <pat:ClaimText>22. A method of cooling in a heat transfer system comprising an evaporator, a condenser and a compressor, the method comprising the steps of: i) condensing a heat transfer composition as claimed in any one of claims 5 to 21, and ii) evaporating the composition in the vicinity of body or article to be cooled; wherein the evaporator temperature of the heat transfer system is in the range of from -40°C to +10°C. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00023"> <pat:ClaimNumber>23< / pat:ClaimNumber> <pat:ClaimText>23. A method of heating in a heat transfer system comprising an evaporator, a condenser and a compressor, the method comprising the steps of: i) condensing a heat transfer composition as claimed in any one of claims 5 to 21, in the vicinity of a body or article to be heated; and ii) evaporating the composition; wherein the evaporator temperature of the heat transfer system is in the range of -30°C to 5°C. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00024"> <pat:ClaimNumber>24< / pat:ClaimNumber> <pat:ClaimText>24. The method as claimed in claim 22 or 23, wherein the heat transfer system is an air conditioning system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00025"> <pat:ClaimNumber>25< / pat:ClaimNumber> <pat:ClaimText>25. The method as claimed in claim 24, wherein the air conditioning system is selected from the group consisting of a mobile air conditioning system, a mobile heat pump, a chiller, a residential air conditioning system, a residential heat pump, a residential air to water heat pump / hydronic system, an industrial air conditioning system, a commercial air conditioning system, and a commercial air source, water source or ground source heat pump system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00026"> <pat:ClaimNumber>26< / pat:ClaimNumber> <pat:ClaimText>26. The method as claimed in claim 25, wherein the mobile air conditioning system is an automobile air conditioning system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00027"> <pat:ClaimNumber>27< / pat:ClaimNumber> <pat:ClaimText>27. The method as claimed in claim 25, wherein the mobile heat pump is an electric vehicle heat pump. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00028"> <pat:ClaimNumber>28< / pat:ClaimNumber> <pat:ClaimText>28. The method as claimed in claim 25, wherein the chiller is a positive displacement chiller. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00029"> <pat:ClaimNumber>29< / pat:ClaimNumber> <pat:ClaimText>29. The method as claimed in claim 25, wherein the chiller is an air cooled or water cooled direct expansion chiller. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00030"> <pat:ClaimNumber>30< / pat:ClaimNumber> <pat:ClaimText>30. The method as claimed in claim 25, wherein the residential air conditioning system is a ducted split or ductless split air conditioning system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00031"> <pat:ClaimNumber>31< / pat:ClaimNumber> <pat:ClaimText>31. The method as claimed in claim 25, wherein the commercial air conditioning system is a packaged rooftop unit or a variable refrigerant flow (VRF) system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00032"> <pat:ClaimNumber>32< / pat:ClaimNumber> <pat:ClaimText>32. A method of replacing an existing refrigerant contained in a heat transfer system comprising: removing at least a portion of said existing refrigerant from said system, said existing refrigerant being R-410A; and replacing at least a portion of said existing refrigerant by introducing into said system the refrigerant as claimed in any one of claims 1 to 4 or the heat transfer composition as claimed in any one of claims 5 to 21. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00033"> <pat:ClaimNumber>33< / pat:ClaimNumber> <pat:ClaimText>33. The method of claim 32, wherein the heat transfer system is an air conditioning system selected from the group consisting of a mobile air conditioning system, a mobile heat pump, a chiller, a residential air conditioning system, a residential heat pump, a residential air to water heat pump / hydronic system an industrial air conditioning system, a commercial air conditioning system, and a commercial air source, water source or ground source heat pump system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00034"> <pat:ClaimNumber>34< / pat:ClaimNumber> <pat:ClaimText>34. The method as claimed in claim 33, wherein the mobile air conditioning system is an automobile air conditioning system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00035"> <pat:ClaimNumber>35< / pat:ClaimNumber> <pat:ClaimText>35. The method as claimed in claim 33, wherein the mobile heat pump is an electric vehicle heat pump. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00036"> <pat:ClaimNumber>36< / pat:ClaimNumber> <pat:ClaimText>36. The method as claimed in claim 33, wherein the chiller is a positive displacement chiller. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00037"> <pat:ClaimNumber>37< / pat:ClaimNumber> <pat:ClaimText>37. The method as claimed in claim 33, wherein the chiller is an air cooled or water cooled direct expansion chiller. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00038"> <pat:ClaimNumber>38< / pat:ClaimNumber> <pat:ClaimText>38. The method as claimed in claim 33, wherein the residential air conditioning system is a ducted split or ductless split air conditioning system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00039"> <pat:ClaimNumber>39< / pat:ClaimNumber> <pat:ClaimText>39. The method as claimed in claim 33, wherein the commercial air conditioning system is a packaged rooftop unit or a variable refrigerant flow (VRF) system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00040"> <pat:ClaimNumber>40< / pat:ClaimNumber> <pat:ClaimText>40. A heat transfer system comprising a compressor, a condenser and an evaporator in fluid communication, and a heat transfer composition as claimed in any one of claims 5 to 21 in said system, said condenser having an operating temperature of from +20°C to +70 °C and said evaporator having an operating temperature of from -40°C to +10 °C. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00041"> <pat:ClaimNumber>41< / pat:ClaimNumber> <pat:ClaimText>41. The heat transfer system of claim 40, wherein the heat transfer system is selected from the group consisting of an air conditioning system, a mobile air conditioning system, a mobile heat pump, a chiller, a residential air conditioning system, a residential heat pump, a residential air to water heat pump / hydronic system, an industrial air conditioning system, a commercial air conditioning system, and a commercial air source, water source or ground source heat pump system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00042"> <pat:ClaimNumber>42< / pat:ClaimNumber> <pat:ClaimText>42. The heat transfer system as claimed in claim 41, wherein the mobile air conditioning system is an automobile air conditioning system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00043"> <pat:ClaimNumber>43< / pat:ClaimNumber> <pat:ClaimText>43. The heat transfer system as claimed in claim 41, wherein the mobile heat pump is an electric vehicle heat pump. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00044"> <pat:ClaimNumber>44< / pat:ClaimNumber> <pat:ClaimText>44. The heat transfer system as claimed in claim 41, wherein the chiller is a positive displacement chiller. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00045"> <pat:ClaimNumber>45< / pat:ClaimNumber> <pat:ClaimText>45. The heat transfer system as claimed in claim 41, wherein the chiller is an air cooled or water cooled direct expansion chiller. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00046"> <pat:ClaimNumber>46< / pat:ClaimNumber> <pat:ClaimText>46. The heat transfer system as claimed in claim 41, wherein the residential air conditioning system is a ducted split or ductless split air conditioning system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00047"> <pat:ClaimNumber>47< / pat:ClaimNumber> <pat:ClaimText>47. The heat transfer system as claimed in claim 41, wherein the commercial air conditioning system is a packaged rooftop unit or a variable refrigerant flow (VRF) system. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00048"> <pat:ClaimNumber>48< / pat:ClaimNumber> <pat:ClaimText>48. Use of the heat transfer composition as claimed in any one of claims 5 to 21, in a chiller, in stationary air conditioning, in residential air conditioning, in industrial air conditioning, in commercial air conditioning, in commercial refrigeration, a commercial refrigerator, in a commercial freezer or in a vending machine. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00049"> <pat:ClaimNumber>49< / pat:ClaimNumber> <pat:ClaimText>49. Use of the heat transfer composition as claimed in any one of claims 5 to 21 as a replacement for R410A. < / pat:ClaimText> < / pat:Claim> < / pat:Claims>