Interior-rated portable propane heaters
We are buying a house at the end of February, but the furnace is condemned and won't be replaced until the following week. The property management company currently taking care of it is heating it with electrical space heaters.
From the time we take possession until our furnace install date, we need to keep the place from freezing. We *can* buy a bunch of little electric heaters, but I'd rather invest in a few propane burners I can use in my shop later down the the road. I know the Mr Heater Big Buddy is rated for indoor use, but I'd probably have to buy two or three of them.
I have 2 full 60-gallon propane tanks and a third half-full one I would use for this... and there's a filling station less than a km from the new house.
Edit: The house is ~2500 square feet with two stories and a full basement.