Ground source heat pump
A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons. Ground-source heat pumps (GSHPs)—or geothermal heat pumps (GHPs), as they are commonly termed in North America—are among the most energy-efficient technologies for providing HVAC and water heating, using less energy than that consumed by resistive electric heaters.