I haven't needed extra heating in a decade in the area where the heat pump is - I should have been more accurate. In other posts I added that I do have (ordinar

I haven't needed extra heating in a decade in the area where the heat pump is - I should have been more accurate. In other posts I added that I do have (ordinary) electric heating elsewhere, the main place these days is my home office (without that there wouldn't be much extra heating). Most of the other rooms are unheated or nearly so (100W-130W w/thermostat is way more than enough), they stay warm enough due to good insulation and some air flow in the house. Bedrooms don't need to be particularly warm, unheated is ok, and the basement (hall, storage rooms, etc) is fine at around 11-13C which it normally stays at even at the coldest time of winter (and fortunately not much more in the summer either - that part of the house is partly below ground and is an excellent stable cool environment).