The present invention relates to an air-to-air heat pump system that uses geothermal heat as a defrost and a compensation heat source, and is composed of a air-to-air heat pump using air as a heat source. And a geothermal heat pump 200 installed in the ground and serving as a heat source for the heat of the ground and used as a defrosting and compensating heat source of the air heat pump. According to the above configuration, the disadvantage of the air heat pump is compensated It is possible to improve the stability and energy efficiency of the system by making it possible to use the geothermal source at a low cost and also it is possible to construct a stable air heat pump system by supporting the most commonly obtained air heat source by the geothermal source There is an effect.
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