Absorption heat pumps use an ammonia-drinking water absorption cycle, in lieu of a vapor-compression cycle, to transfer heat. Ammonia is definitely the refrigerant, and water is definitely the absorber. The ammonia condenses at one of the method’s coils to release heat and evaporates at another coil to absorb heat. Full https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/