[AlanSE]

I've also heard about how homes in Japan are (comparatively to the US) poorly insulated. So that tracks.

[ramchip]

It depends where in Japan. Homes in Tokyo are poorly insulated. Homes in Hokkaido are usually pretty decent.

[presentation]

Yep, it doesn’t get that cold in Tokyo so there’s less incentive.

[fomine3]

Since Japan import all fuels, insulating must be higher priority but still isn't.