Geothermal heat pump

A ground source 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.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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