heat-pump

heat pump

noun
a device that uses a compressible refrigerant to transfer heat from one body, as the ground, air, or water, to another body, as a building, with the process being reversible.

Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heat pump
 
n
a device, as used in a refrigerator, for extracting heat from a source and delivering it elsewhere at a much higher temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
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