Most heat pumps also can work within a cooling method where the cold refrigerant is moved in the indoor coils to cool the home air. Air source heat pumps look just like air-conditioning units. Their sizing relies on how much heat they will really need to deliver for your house https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/