[seanmcdirmid]

That really isn't true. A lot of older housing in Japan has really bad insulation, you are basically stuck with a kotatsu in the winter not by choice.

[namdnay]

That’s on purpose, to avoid mold in the summer. And heating a kotatsu and a bed instead of an entire house is way more energy efficient

[ricktdotorg]

i took GP's comment of "heating specific objects" to mean an object like a kotatsu.