Most heat pumps also can work inside a cooling method where by the cold refrigerant is moved throughout the indoor coils to chill the place air. Split Methods: Have 1 coil and lover within and 1 outside. Supply and return ducts hook up with the indoor central coil and supporter. https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/