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 h2o is definitely the absorber. The ammonia condenses at one of the technique’s coils to release heat and evaporates at another coil to soak up heat. https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/