Posted a couple days back about how well my Mansfield handled -6*. Last night dropped to -16* - definitely a different beast. Was able to keep the downstairs at 65* and upstairs at 54*. Back up to 68* now (high for today is supposed to reach about 6*). Definitely burning through the wood at these temps. Loaded last night at 11pm, and again at 3am, and again at 8am. But.....still haven't turned on the oil furnace yet - that's my goal - I want to see if I can make it solo on wood. I doubt we'll see colder temps than last night, so, at least I know that I can keep the house at reasonable (extra clothes!) temps even with brutal cold. Cheers!