Two years ago we had an ice storm come through and was without power for nine days. We run a corn stove and use forced air heat "propane." Since we did't have a wood stove I couldn't use any of them. I didn't use them constantly, but I used the free standing kero heater, which put out good heat, and also used a wall mounted propane heater 35000 btu . They worked good short term but finally got a generator.