The air conditioner has a compressor (2), the heat from which passes to an inner heat exchanger (6), an expander (8) and a radiator (10) and the exhaust gas heat exchanger (13). The coolant in the expander is expanded at a temperature below a suction temperature of the coolant in the compressor. It is contacted in the radiator with heated air, heated in the exchanger (13) and compressed in the compressor.
