Pick a central or south-facing room in the house in which to live, then close off the other rooms. The closed-off rooms will act as further insulation between whatever heat you generate in the designated room, and the outside.
Move mattresses into the designated room for sleeping, put sleeping bags on top of those. Enough insulation in the form of bags / blankets, and you should be able to sleep warmly enough.
Even with no heating devices whatsoever, that arrangement should be far, far warmer than being outside in a rigged structure with a campfire. Your house is (or should be!) totally wind- and water-proof, it has insulation in its structure, etc, etc.
I'd eat and drink like I was on the trail - lots of fat and some protein at supper, plenty of water, etc.
Move mattresses into the designated room for sleeping, put sleeping bags on top of those. Enough insulation in the form of bags / blankets, and you should be able to sleep warmly enough.
Even with no heating devices whatsoever, that arrangement should be far, far warmer than being outside in a rigged structure with a campfire. Your house is (or should be!) totally wind- and water-proof, it has insulation in its structure, etc, etc.
I'd eat and drink like I was on the trail - lots of fat and some protein at supper, plenty of water, etc.