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* Environmentally friendly: using groundwater as the cooling and heating source, energy conversion, reducing the emission of CO2 and other atmospheric pollutants, avoiding cooling tower noise and mould pollution;
* Energy saving: cooling and heating source temperature conditions are better than ambient air, with high operating efficiency;
* Cost saving: integrating heating, air conditioning and domestic hot water, enhancing economy;
* Stable: water temperature conditions are relatively; * Stable: the water temperature conditions are relatively stable, the fluctuation range is much smaller than the air temperature changes, making the operation reliable and stable;
* Flexible: the unit options are diverse, decentralized water fans can simultaneously air conditioning, heating and achieve the effect of four controls;
* Aesthetic: compared with air-cooled heat pumps without outdoor units, to ensure the aesthetics of the building facade;

Summer: cool underground well water (relative to ambient temperature) is passed through the water source heat pump unit to take away heat from the air-conditioning system refrigerant carrier, making the room cooler.
Winter: Warm underground well water (relative to ambient temperature) is passed through the water source heat pump unit to exchange heat for the air-conditioning system refrigerant carrier, making the room warm.