HEAT PUMP - It is a device that is designed to move thermal energy in the opposite direction of heat flow by absorbing heat from a cold space which is released to a warmer space. Basically it works as a compressor that cycles hot or cold air.
Heat pump is a versatile, efficient cooling and heating system. Thanks to a reversing valve, a heat pump can change the flow of refrigerant and either heat or cool a home.
When talking about commercial or residential HVAC, a heat pump is usually an all-in-one heating and air conditioning system that works year-round to keep you comfortable.