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How do ASHPs compare with the efficiencies of Ground Source Heat Pump (GSHP) systems?

April 26, 2017ashps compare efficiencies ground GSHP source SYSTEMS

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How do ASHPs compare with the efficiencies of Ground Source Heat Pump (GSHP) systems?

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ASHPs typically have a COP (Coefficient of Performance) of around 3, whereas GSHPs are nearer 4. However, at a COP of 3, all heat pumps are much more efficient than direct electric heating, oil, LPG or even natural gas, making them a very attractive proposition.