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Sealing is better, but there's a scale of involvement. My folks have an overpriced umbrella thing in their basement chimney as there is an old fashioned coal stove thing there. It means theoretically you can quickly remove it.
Other ones are sealed just up the chimney with a black painted board with a square of insulation on top.
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our chimneys are still open but it's highly unlikely we'd ever use an open fire or even the gas fire again. Do they need to be sealed or can they just be left as is? I imagine they are a good way to vent heat out but then there are probably worse offenders in our place.
I looked into this and got a lot of mixed messages.
Sealing is apparently the best thing to do, but you have to consider problems specific to your home that you may create... like the rooms not being able to breathe, and condensation in the chimney and what problems such moisture/water may cause in the longer term.
I bought a Chimney Sheep and just figured that's saving the heat I have whilst punting the problem of whether to seal or not far down the road.
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@Howard
On the subject of burners and shit, our chimneys are still open but it's highly unlikely we'd ever use an open fire or even the gas fire again. Do they need to be sealed or can they just be left as is? I imagine they are a good way to vent heat out but then there are probably worse offenders in our place.