Yeah I was thinking about those really cold cold days that can happen. I will do what Kazoo suggested... shut down the rest of the house, define one area for living area, probably the most interior of spaces.
I like the soap stone stove idea. Can you just put those in any house? basically cutting a hole in one of the walls for the chimney? I have a gas fireplace, but gas will not be around forever. Plus it requires electricity. I can run it off of a couple C-cells in theory and there is a place to put batteries in a battery pack, but that isn't forever.
Layers of preparedness. Short term i have a Mr Heater, but I need to start thinking about what if...