We weren't without heat, since we have fires, and fortunately I've always loved playing with fires and have spent a lifetime deprived of the opportunity to do so XD But the kind of heat that works without attendance is definitely easier and more effective!

I wonder whom I could get to drink sake with me by candlelight...)

Well, I'd volunteer your husband as the first choice ;-) It was warm sake too, since we had the ability to heat things on the stove. Very pleasant!