Plenty of people won’t want preparing permission for an air source heat pump (Until you live in the conservation area, by way of example). But planning departments do have some policies to be aware of. If the answer to these is Indeed, an air source heat pump could possibly be https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/