Did you use a fire grate with a big space underneath and keep it swept clean? Or did you build up a big bed of ash under the grate? On the advice of a chimney sweep I put a perimeter of bricks under the grate to form walls and we're currently filling it with more and more ash (it really takes a while). It's starting to make a difference in how much heat comes back into the room. Without that void underneath, the fire doesn't burn so hot and cold air doesn't get pulled through so quickly.(It feels like it's getting warmer - may all be wishful thinking though, I haven't taken any measurements!)
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