What is the primary purpose of the compressor in a heat pump?

The primary purpose of the compressor in a heat pump is to raise the pressure and temperature of the refrigerant. This is a crucial step in the refrigeration cycle, as the compressor takes the low-pressure, low-temperature refrigerant vapor coming from the evaporator and compresses it, significantly increasing both its pressure and temperature. This high-pressure, high-temperature vapor is then sent to the condenser, where it releases heat, allowing the refrigerant to change back into a liquid state.

By increasing the pressure and temperature of the refrigerant, the compressor enables the heat pump to transfer heat either into or out of a space, depending on the mode of operation—heating or cooling. The efficiency and effectiveness of the heat pump in moderating indoor temperatures largely depend on the proper functioning of the compressor, making it an essential component of the system.