[Darrengineer]

I’m curious which areas this occurs on earth and what percent of population live there. I would guess a negligible portion. In the US, I would think it’s almost nonexistent. I’m from Minnesota and went to university in North Dakota - places with some of the coldest and most severe winters in the US. +40C in the summer and somewhat regularly down to -40C windchill temperature in the winter. If it were me, a place with actual air temperature of -40C with any kind of wind occurring would require multiple forms of heating for me to consider it safe for my family relying on only one or even two sources of heat doesn’t seem reasonable.