I'm not sure how many people go the what I would consider that extreme. Man you don't even need a refrigerator
I turned off my heat pump and started my coal stove which is in the basement and luckily where all of my water lines are. With the setup I have my home takes a few days to absorb the heat like a big heat sink. It is warm within a few hours but it gets really nice after a few days. Last evening it was at 72F because I can't make it any cooler than that. Upstairs is cooler but we only sleep up there.Outside temps have been in the single digits overnight and even into the minus. The funny thing is that by Friday I'll be able to restart the heat pump because we will get into the 40's by noon.
I still like the winter(please don't hit me). The snow is a pretty sight like a big white paint job on everything.
Just a tip or two if you're in a cold place and aren't prepared for it.
Crack your water valve ever so slightly overnight. The running water will keep the lines from icing up. Open up cabinet doors where water lines are to let in heat.
If you have a bathroom with a vent fan, you know, the kind that takes all the heat out of the space. Temporarily cover it .You could make something up with magnets and a pie cover...or simply tape it over.
If you have a spare unused chimney cover it, plug the hole inside. It just vaccums all the warm air right out of your house,especially if it's windy outside.
Find a fat buddy to snuggle with.Skinny people don't give off as much heat..... Ok maybe that's not such a good idea.

Scratch that last comment.