In the dry system, this heat is circulated as heat air by way of ducts and vents. Air-to-air heat pumps can circulate either very hot or chilly air. Lots of the upkeep requires for air source heat pumps replicate that of typical air-con and furnace installations, including normal air filter https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/