A college mate from Canada - can't immediately remember what province/corner he resided in - told me of people leaving small heaters burning under car sumps to prevent the engine oil from freezing.
When I said I thought that seemed a mildly dodgy practice, he said Canucks were always up for a trek in harsh temperatures, following a nice warm-up around a burning vehicle .......
All part of the rich warp & woof of Canadian heritage/folklore I suppose......
( Another guy, ummm......well.... living there courtesy of the wise Canadian military policy of the time, due to a dislike for jungle trekking & the contents of AK47's , shall we say......... opined that after his part of Texas, the temperatures were just fine, thanks ...........
)