The interior part is usually fitted higher on a wall close to the ceiling, necessitating the use of a handheld handheld remote control to alter configurations. Ammonia is toxic but has zero GWP. Packaged GAHPs keep the ammonia circuit outdoor or in mechanical rooms for each code with proper air https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/