@mhagland@JeremyClarkson You might like to read the manufacturerโs technical document, itโs all to do with efficiency and they are not efficient when the air temperature drops below 0c, a back up heat source is then needed ie electricity which powers the resistance coil
@mhagland@JeremyClarkson Question, how can heat be extracted from air when it is -25c, that makes absolutely no sense, what are the efficiency figures for an ASHP at -25c?