ARTICLE : How Does a Residential Geothermal Heat Pump Work? tek-think.com

Residential Geothermal Heat Pump – ( TeK-THinK)

Geothermal heat pumps which are sometimes referred to as GeoExchange, earth-coupled, ground-source, or water-source heat pumps, have been in use since the late 1940s. They use the constant temperature of the earth as the exchange medium instead of the outside air temperature.