Anyone with a refrigerator or an air conditioner has
witnessed the operation of a heat pump, even though
the term heat pump may be unfamiliar. All of these
machines, rather than making heat, take existing heat
and move it from a lower-temperature location to a
higher-temperature location. Refrigerators and air
conditioners are heat pumps that remove heat from
colder interior spaces to warmer exterior spaces for
cooling purposes. Heat pumps also move heat from a
low-temperature source to a high-temperature space for
heating.
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