Tonight is our second night of ~9deg F here in NE MA. We've only had one other night of single digit temps and I had a similar experience: I can't keep the house up to temp like I can above 20. So I'm at about "single digit temps - 3, Jotul C450 - 0" This year is much better than last, with several insulation improvements including rim joists in the basement and insulating the attic fold-down stairs. My energy audit told me about those. I have some further refinements in the insulation dept but these were the biggest. Also I have a lot better store of wood, dryer and more of it. These have all added up to very little oil used since our tank was filled in Oct, and the mild winter has helped a lot too. Single digits have me beat though. Today I have burned hot and heavy trying to catch back up, and finally got the bedroom temps to go from 62 to 64. Reloading quicker than usual and keeping the fan on high have helped. Here are some future updates that are sure to help: need a block of plate, OAK might keep the outside air out better, and plug more small insulation holes. I've been wrestling with whether or not I have a big enough insert (Jotul C450), and am fairly convinced I'm big enough once I incorporate the rest of my projects. My house is only about 1200 sq ft and not the greatest layout for wood heat. But I can hit 80* if it's over 20* out, and not drop below 65 during the overnight burn, so a bigger stove would just be too hot and eat more wood. The longer overnight burn would be nice, but I'm steadily getting the trick of extending my overnights. How well are you fairing? What tricks have helped you overcome those handful of REALLY cold nights, when otherwise your stove keeps up just fine?