To enhance refrigeration efficiency of a refrigerator/air conditioner having loads on both cooling/heating operation and refrigerating/freezing load.

In a convenience store, for example, a single compressor is shared by an indoor unit 7 for air conditioning and a showcase body 10. When a heating load and a refrigerating/freezing load are generated simultaneously in winter season, for example, air in the showcase is employed as a hot heat source for heating and indoor air is employed as a cold heat source for refrigeration/freezing. Since conventionally exhausted waste heat is utilized mutually and simultaneously, energy can be saved.