“If you’ve bought an oil furnace, a man’s about to test to come back market you an oil furnace since it’s the easiest thing that goes again in,” he reported. Ammonia is harmful but has zero GWP. Packaged GAHPs retain the ammonia circuit outside or in mechanical rooms per code https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/