Heat pump that saves electricity bills Similarly, in today's increasingly tense energy environment, in order to recover the heat from the low-temperature hot gas usually discharged into the atmosphere, the low-temperature hot water discharged into the river, etc., the heat pump is used to transfer the thermal energy from the low-temperature object to the high-temperature object, and then the high-temperature object. Objects to heat water or heating, so that the heat can be fully utilized. The working principle of the heat pump system is the same as that of the refrigeration system. To understand how a heat pump works