Most heat pumps could also run in the cooling mode wherever the cold refrigerant is moved with the indoor coils to chill the space air. The refrigerant in an air-source heat pump absorbs heat through the outside air and turns into a gas via evaporation. This gas is then compressed, https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/