See Also: Air Conditioner
Device for controlling the air Temperature in buildings. A Heat Pump operates like a reversible Air conditioner. In summer, air flowing across the colder, heat-absorbing side of
a Refrigeration apparatus is chilled and ducted through the building, and the heat is vented
through an apparatus outdoors. In winter, the flow of the refrigerant is
reversed. It absorbs heat through the outdoor apparatus, and the heat is released
using the indoor apparatus and ducted through the building. Heat pumps are
inefficient when the outside temperature is below freezing.