7200' here, I'll keep my furnace as well. I usually only keep it at 62°, unless I want a $600 gas bill. But, that the tradeoff of having mild awesome summers.

Earthquakes would say otherwise for at least part of the US. Also, without full-time mechanical ventilation, that would be misery in a lot of the US. The climate is also different to some places in Europe and varies hugely on US region

nobody can afford that here lol

It does not have to be brick and mortar. The house with the best insulation I know is made of wood and straw bales.

That would be freezing to me, but we live in a place that rarely dips much below freezing and gets super hot with high humidity. Humidity + cold also sucks. We were like 23 today (70something) and have a number of days over 35 in the summer (with 90+ % humidity). I work outside in that heat so I'm much more acclimated to that

I've heard some people say it in England but dunno if it's actually common there. Was only a tourist.

My old housemates were the opposite lol. We tried saving every penny on heating costs. In the winter, we taped the windows over with cardboard for better insulation (they are old single-pane windows), and fashioned an automatic door closer from an elastic cord to keep the door into the living room shut (our "warm zone"). Instead of using gas heating, we mined ETH with our gaming PC's (this was before ethereum went proof-of-stake). Between the three of us, the total energy output was close to 2kW, so totally viable for keeping the living room warm. Pretty sure we ended up earning money from heating the house lol.