

They’re great, aren’t they?
Heat pumps normally use more electricity to heat than to cool, so it’s surprising that the opposite was happening for you.
My bills have always been lower in the summer. The only time the bills have been unusually high was when there was a problem with the connection between the main electrical supply and the pump, causing it to keep restarting and use more energy.
Heat pumps first extract heat from the outside air before moving it indoors (I don’t know the exact mechanics of it). The colder it is outside, the more energy is needed to do this. When it’s cooling, it only moves the heat from inside to outside.