In summer a heat pump draws heat out of your home to cool it. In the winter, it draws heat from outside air into your home to warm it. Many heat pumps have a booster electrical-resistance heater that automatically heats outside air even more. Outside air always has heat in it -- even at very low outdoor temperatures.
A heat pump components includes a compressor, fan, outdoor coil, indoor coil, and a refrigerant.
The efficiency of heat pumps is rated using SEER (for cooling efficiency) and HSPF (for heating efficiency). A heat pump uses electricity as its power source.
