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