The object of the invention is a system for regulating the temperature of particularly a server room, where the premises are equipped with an air-conditioning unit. The object of the invention, furthermore, is an application intended to operate the foregoing system, where an external primary circuit, an internal secondary circuit and an air- conditioning unit is operated during the operation of the system. The system according to the invention is characterized in that it furthermore includes a cooling array complete with a thermal regenerator that includes a cooling array complete with a thermal regenerator (T1) that includes an external primary circuit and an internal secondary circuit; where the external primary circuit is primed with a primary transmitting medium which may be circulated with a first fluid machinery, expediently a primary pump (P1), and passes through a primary heat exchanger (HI) unit located outside the premises; the internal secondary circuit is primed with a secondary transmitting medium which may be circulated with a second fluid machinery, expediently a secondary pump (P2), and passes through a secondary heat exchanger (H2) unit located inside the premises; and the external primary circuit and the internal secondary circuit can be controlled independently of each other, by a model suitable for control. The application according to the invention is characterized in that during the operation of the system, the following operating modes alternate: free cooling, case 1 according to the HV model, case 2 according to the HV model or case 3 according to the HV model.