I had a jotul602 in an 8 x 12 cabin in West Virginia, Winter highs often around 15 - 20 f . The only way to avoid overheating was to leave a window open and run a smoldering fire, meaning lot of creosote in chimney, necessary to clean chimney regularly, and not so good for environment. Now we have 2 sardines in 10 x 12 cabins here in northern california where the climate is pretty mild, lows around 40 in winter. Not really comparable to your situation.