Yes, I have propane as a back-up. It doesn't get used much, as it is expensive. When we have visitors, we might turn it on in the morning to get the temp up quickly if it is really cold out, then the stove will provide heat all day. For example we ran it Sunday morning to bump the temp up 2 degrees, and it has not run since. I don't expect to run the furnace for another week or so looking at the forcast with highs in the 30s and lows in the 20s. The stove isn't rated to heat this much space, but it does. I do have a daughter who likes her room to be 80 degrees, so she has a space heater in her room. My exterior walls are 2x6 with decent insulation, but I also have a bunch of windows and they aren't anything special. We also added some blown insulation to the attic a few years back; that was a good deciscion.