Absorption heat pumps use an ammonia-drinking water absorption cycle, as opposed to a vapor-compression cycle, to transfer heat. Ammonia is the refrigerant, and drinking water will be the absorber. The ammonia condenses at one of the system’s coils to launch heat and evaporates at the opposite coil to absorb heat. https://bookmarkboom.com/story20302718/5-essential-elements-for-heat-pumps