Most heat pumps also can run in a cooling mode the place the chilly refrigerant is moved through the indoor coils to cool the place air. A lot of the maintenance requires for air source heat pumps reflect that of common air-con and furnace installations, like common air filter replacements https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/