How heat pumps work An electric heat pump can heat your home during the winter and cool it during the summer. The major parts of a heat pump include: Compressor: This increases the pressure of the refrigerant so that it will accept the maximum amount of heat from the air. Condenser: Coils that move heat to or from the outside air. Evaporator: Coils that move heat to or from the air inside the home. Air handler: Fan that blows the air into the ducts of the home. Components 1, 2, 3 and 4 are found in all standard air conditioners. Reversing valve:Changes the heat pump from air conditioning to heating, and vice versa. This is not part of the thermostat.

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