The look of the heat pump has a substantial influence on its efficiency. Lots of air source heat pumps are built mainly as air con models, largely for use in summer time temperatures. The ECOMOD 290HT choice of monobloc air source heat pumps are available in 3 chassis dimensions and https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/