Another possible approach is to keep your home cool (keep it above 50 to avoid pipes freezing because that just sucks to deal with regardless of responsibility) and use a small like 200w heater pointed at yourself to warm up some. I live in a century old farm house and do that because it’s drafty as heck in parts of the house and impractical to fully heat the entire house to a fully comfortable temperature once winter truly sets in and it’s consistently around 0F