Insulated breathable tent in living room
Place blankets over tent
Fire up a small butane heater for about 15 to 20 minutes
Place more blankets around the bottom perimeter
Should buy you one night
Repeat next day
Good idea. It was 30 in my house last month. Colder than outside. I stayed in my car wrapped in blankets. Turned car heater on every hour for a few minutes.
We went a week once. It was in the low 40’s in the house. We ended up going to bed at 7 pm, and up when the sun rose.
We had a fireplace to keep the house from freezing, so that was OK. It’s amazing how quickly you revert back to Little House on the Prarie.