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Heat pump is a device that transfers heat energy from a low-level heat source to a high-level heat source. It is a energy-saving high-efficiency device that makes full use of low-grade heat energy. It is a new energy technology that attracts much attention all over the world. As we all know, heat can be transferred spontaneously from high-temperature objects to low-temperature objects, but not in the opposite direction spontaneously. The working principle of a heat pump is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse cycle. It only consumes a small amount of reverse cycle net work to obtain a large amount of heat supply, which can effectively utilize low-grade heat energy that is difficult to apply to achieve energy-saving purposes. It is different from the familiar mechanical equipment that can increase potential energy-"pumps"; heat pumps usually first obtain low-grade heat energy from natural air, water or soil, and then use electricity to do work. Then provide people with high-grade heat that can be used. According to the different types of heat sources, it can be divided into: air source heat pump, water source heat pump, ground source heat pump, dual source heat pump, etc.