From Longman Dictionary of Contemporary Englishheat pumpˈheat pump noun [countable] TEMMACHINEpart of a machine that takes heat from one place to another
Examples from the Corpus
heat pump• Both the photovoltaic and wind power systems for domestic hot-water provision would be even more effective if linked to a heat pump.• Energy systems analysis, heat pump control and applications.• His heat pump is relatively new, but the air-handling system is two decades old. 