Absorption heat pumps use an ammonia-h2o absorption cycle, rather than a vapor-compression cycle, to transfer heat. Ammonia is the refrigerant, and h2o could be the absorber. The ammonia condenses at among the list of process’s coils to release heat and evaporates at the other coil to absorb heat. Heat Trade: https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/