Air conditioning system combined with an electricity generating system

A cogeneration system including an engine (50), which drives a generator (52) to generate electricity, a cooling/heating unit (60), which includes at least one compressor (61), a four-way valve (62), an outdoor heat exchanger (63), an expansion device (64), and an indoor heat exchanger (65), to establish a heat pump type refrigerant cycle, and a refrigerant over-heating unit (70A, 70B, 71) to supply heat of cooling water used to cool the engine (50) to a suction-side refrigerant line (66) of the compressor (61) of the cooling/heating unit (60), and to supply heat of exhaust gas discharged from the engine (50) to the suction-side refrigerant line (66) of the compressor (61) and to a discharge-side refrigerant line (67) of the compressor (61). In accordance with the cogeneration system, it is possible to maximize absorption of the waste heat of the engine while preventing compressor malfunction, and thus, to increase the refrigerant condensing temperature of the indoor heat exchanger. Thus, an enhancement in heating performance is achieved.