While bigger Value heat pumps may be additional effective a 2024 research concluded that with the British isles "from an Electricity method point of view, it is Total Price tag-optimum to structure heat pumps with nominal COP inside the choice of 2. Lots of the maintenance requires for air source https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/