Geothermal Heat Pumps - Cooling Mode

In summer, the fluid removes heat from the building and transfers it to the relatively cooler ground in order to cool the building.

Geothermal heat pumps use the stable temperatures of the ground (often vertical boreholes typically are 100 to 400 feet deep) as a heat source to warm buildings in winter and as a heat sink to cool them in summer.  Also called ground-source heat pumps or Geoexchange units.