A geothermal heat pump is a system that uses the ground’s constant temperature to act as a balance for the air temperature inside of a house. Despite the fact that surface temperatures can be affected by the air temperature, ground temperatures can be relatively stable several feet below the surface throughout the year. This means that cold or hot air temperatures can be exchanged with the steady ground temperature by water flowing through a geothermal heat pump system. Geothermal heat pumps can also be used to supply hot water to a home as well due to the process used.