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What is the difference between an air source and a ground source (geothermal) heat pump?

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What is the difference between an air source and a ground source (geothermal) heat pump?

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An air source heat pump extracts heat from the outdoor air in heating mode, while a ground source unit extracts heat from the ground. The temperature deep in the ground is constant at about 10 oC so a ground source unit can operate more efficiently when air temperatures are below 10 oC, but will be less efficient at temperatures above 10 oC.

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