A bit more around managing expectations vs managing the stove
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We got a bit of a mild spell friday - almost hit the freezing point. Then temps dropped to @ -14 C again by Sunday morning, and the house was @ 65 deg when I woke up. I was quite happy with that, especially as we didn't load up for an overnight fire (house was very warm, lots of hot coals when we went to bed, so we just let it ride). Today it's down to -25 deg C - things are a bit different of course. The stove would get loaded up for bedtime for sure this week. Still we would likely wake up to mid - 60's in the a.m. I love the sound and feel of the fire roaring back to life when I reload the stove in the morning. Going from 65 to 70 is easy after that.
IMHO things should be consistent but only to a point - expectations should fall within a range especially with a tube stove.
But if you're waking up to 68 deg that's not too shabby, something's right with that routine. Sounds like the stove is treating you well.