Most people received’t have to have scheduling authorization for an air source heat pump (Until you live inside a conservation area, for instance). But preparing departments do have some guidelines to be familiar with. R290 can achieve higher efficiency amounts using a+++ Strength rankings over the Haier Heat Pump array. https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/