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