What is the advantage of a Geothermal Heat Pump (GHP) system over a conventional Air Source heat pump system?

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What is the advantage of a Geothermal Heat Pump (GHP) system over a conventional Air Source heat pump system?

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A conventional air source heat pump system absorbs heat from the outdoor air in winter and “dumps house” heat into outdoor air in summer. However, a Geothermal Heat Pump system uses the earth or ground water or both as the sources of heat in the winter, and as the “sink” for heat removed from the home in the summer. Therefore, a Geothermal Heat Pump system would exceed a conventional air source counterpart in respect of followings: • Economical – According to the EPA, a Geothermal Heat Pump system can reduce energy consumption – and corresponding emissions – up to 44% compared to a conventional air source heat pump system because the temperature of the earth is lower in summer and higher in winter than that of the air outside. • Durable & Reliable – A Geothermal Heat Pump is housed indoor and protected from harsh elements and vandalism. Moreover, the earth loop, if installed properly, can be expected to perform well for 50 years or more, and few moving parts like compressor can last ab