Provided is a
heat pump external unit comprising: a housing and within the housing an
evaporator, the housing including an air inlet and an exhaust outlet, a fan to move air from the inlet through / over the
evaporator and out through the exhaust outlet of the housing, the air inlet being provided in a rear or side face of the housing, and the exhaust outlet being provided in an upper or front face of the housing, the exhaust outlet having a generally circular cover grille, the fan being located behind the cover grille and including a motor and / or bearing substantially at the centre of the grille, the
heat pump external unit including a connection to a
remote unit including a control panel and information display, the
heat pump external unit including
control logic for controlling the fan and a compressor connected to the
evaporator, the
control logic being arranged to operate with the control panel to display information on the operation of the unit and to set one or more parameters relating thereto, the heat pump external unit further comprising a status display indicator comprising a plurality of addressable illumination elements overlaid by a diffuser and / or a printed image or logo, wherein the diffuser and / or the image at least partially obscures or blurs the individual addressable illumination elements, wherein the addressable elements can be controlled to illuminate the diffuser and / or printed image or logo to render the exhaust outlet visible in
darkness, wherein the addressable illumination elements include at least one element of selectable colour and / or wherein the plurality of addressable illumination elements include elements of multiple different colours and wherein intensity of at least some of the plurality of addressable illumination elements is variable in multiple steps or substantially continuously, wherein the
control logic is controllable to send one of a plurality of static patterns or
animation sequences to control the addressable illumination elements based on both a status of operation of the heat pump external unit and based on one or more stored configuration parameters so that different states of operation of the device are discernible from observation of the collective arrangement of the addressable illumination elements