This air-conditioning system requires 100% thermo-hygrostat function. The cooling, heating and dehumidification complex functions are controlled according to external environmental conditions according to the change of four seasons, and precision multi-control functions due to proportional control are required. The compressor performing the cooling function shall be applied with constant speed and variable type exclusively for the heat pump to satisfy the seasonal changes in exhaust waste heat source energy recovery function, and the load variation according to application of the condenser heat exchanger of economizer, and the design capability shall be sufficient accordingly.