Compared with the conventional heating system, the ground source heat pump system can save about 50% energy. It is an energy-efficient air conditioner using renewable energy. However, the existing ground source heat pump air conditioner still has the defects of low energy efficiency and high energy consumption.

At present, the water on the water source side of the existing water source heat pump needs auxiliary equipment to supplement or remove heat. The investment in auxiliary equipment increases the cost, and the heat discharged is not fully utilized, and the water temperature of the water circulation is unstable, which is not conducive to use.

In the prior art, in order to increase the efficiency of heating or cooling various swimming pools, double-system swimming pool heat pumps are mostly used. When one of the systems stops operating, the impact on the pool water temperature is relatively large, and it is not possible to provide energy-saving, high-efficiency and stable heating and cooling to the pool.