An air temperature control unit comprising a refrigeration circuit (10, 6, 7, 7a, 12, 13, 14), a warm air chamber (4) housing a condenser (7) and a cool air chamber (5) housing an evaporator (10); wherein a water holding tank (24) is in fluid communication with the evaporator for collecting condensed water and a water pump (20) communicates the condensed water from the water holding tank (24) through a water purifying system (21, 22) to a water outlet device (23). A mixture of cooled air from the cool air chamber (5) and warm air from the warm air chamber (4) is used to maintain a predetermined inside temperature while excess cool air and warm air is exhausted to the outdoor environment. The system can therefore operate continuously to supply purified water without stopping the unit due to warm and cooled air being continually mixed to maintain the predetermined inside temperature, while excess warm and cooled air is exhausted to the outside environment.
