Dealing with 10-15 overnights and 20s during the day in my area. I just can't get the 30 to keep up. It seems the biggest problem is coaling levels that result from overfeeding. I miss my old Defiant and have been searching for another for weeks now. The 30 is eating just as much wood in these temps as the VC did, but does not put out nearly the amount of heat. I wanted to keep the Defiant to swap out the stoves when the real cold temps came to roost, but sold it when I got tired of moving it from here to there. The house is a Cape and the sq ft is well under the 2200 that the 30 is rated for. I am also watching for a f600 or 5700 to combat this scenario. Cold won't last forever, so we will just keep baking foods to help the temps.