The traditional Japanese solution is not to heat the house, but only the table you're sitting at. https://en.wikipedia.org/wiki/Kotatsu https://en.wikipedia.or

The traditional Japanese solution is not to heat the house, but only the table you're sitting at. https://en.wikipedia.org/wiki/Kotatsu https://en.wikipedia.org/wiki/Kotatsu Even these days it's common to use gas heaters that are turned off for the night, meaning that it's freezing cold particularly in the mornings.