Rumford retrofit?

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The crucial part you didn't mention being "while it runs", because fireplaces (especially when consuming a godawful amount of wood measured in 10s of lbs per hours ..!!!) tend to run only a small fraction of a day, while contributing to the loss side of the equation 24/7/365.

Any person claiming heating efficiency while disregarding this obvious fact has not looked at the whole picture.

Again, I'm attracted to fire. I get it. But that doesn't make facts go away.
I just close the damper on mine when I’m done but I get it most people don’t.