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Q What is a heat pump?

A A heat pump is essentially an air conditioner (A/C) in reverse. An A/C pumps heat out of the house into an outside air exchanger and into the outside air. A heat pump uses very similar equipment and pumps heat from the outside air into the house. The heat pump has a reversing valve to go from COOL to HEAT. An AIR CONDITIONER gets less efficient in cooling a house as the outside air gets hotter. Similarly, the HEAT PUMP gets less efficient as the outside air gets colder. For more details, refer to pg. 4 of the Professional reference guide.