Absorption heat pumps use an ammonia-water absorption cycle, as opposed to a vapor-compression cycle, to transfer heat. Ammonia would be the refrigerant, and h2o is the absorber. The ammonia condenses at one of the method’s coils to release heat and evaporates at another coil to soak up heat. Get better https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/