This is going to sound silly, but how are the seals on all your windows and doors? What kind of construction is your home? The adobe style places in NM I grew up in were insanly good at temp regulation in even the most extreme swings and after we replaced all the windows and doors, it was even better.Yea, I think that a generator & backup heating is going to be the first thing I tackle. Not even a real prepper thing. I think that's just common sense that I've been neglecting and it's bugged me every winter since my daughter was born. We lose power at least once every winter and it usually lasts for 1-3 hours. Every time it happens, my first thought it "I have no plan for what happens if it doesn't come back on before the house starts freezing".