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Ground-source heat pumps (GSHPs) – or geothermal heat pumps (GHP), as they are commonly termed in North America – are among the most energy-efficient technologies for providing HVAC and water heating, using far less energy than can be achieved by burning a fuel in a boiler/furnace or by use of resistive electric heaters.
That heat can be extracted with a geothermal heat pump more efficiently than it can be generated by conventional furnaces. [10] Geothermal heat pumps are economically viable essentially anywhere in the world. In theory, geothermal energy (usually cooling) can also be extracted from existing infrastructure, such as municipal water pipes. [14]
In general, heat pumps work most efficiently (that is, the heat output produced for a given energy input) when the difference between the heat source and the heat sink is small. When using a heat pump for space or water heating, therefore, the heat pump will be most efficient in mild conditions, and decline in efficiency on very cold days.
Geothermal heat pump systems usually involve far less maintenance cost. And the Department of Energy rates geothermal heat pump equipment for a longer lifespan than conventional systems.
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The first geothermal heat pump was a DX system built in the late 1940s by Robert C. Webber. [3] It used Freon gas and buried copper tubing, for increased efficiency. Later [ when? ] geothermal heat pumps designs started incorporating an additional plastic pipe loop to circulate water in deep wells in an effort to gather sufficient heat for ...
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