Many people won’t want preparing permission for an air source heat pump (Until you live in a conservation place, one example is). But arranging departments do have some policies to pay attention to. From the exceptional instance that they do will need preparing authorization, it’s typically down to noise concentrations https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/