Keywords: Engineer checking controls on heat pump.jpg en In its cooling mode and https //en wikipedia org/wiki/Air_source_heat_pumps air-to-air heat pump works like an ordinary air conditioner extracting heat from inside a building and rejecting it outdoors But unlike an air conditioner the https //en wikipedia org/wiki/Heat_pump heat pump can provide space heating as well by operating in a reverse cycle https //1houraz com AC Repair Phoenix Photo by https //en wikipedia org/wiki/United_States_Department_of_Energy Energy Department 2014-07-01 https //www flickr com/photos/departmentofenergy/14366335737/ ENERGY GOV other versions PD-USGov United States Department of Energy |