I have a 1940’s home that is insulated well with new windows, and we find we get a pretty strong downdraft down the chimney when it rains or there is a pressure disturbance. I’m sure the flue door isn’t that great but there is a aluminum cap on top.
I’ve been keeping a window cracked in the hopes it pulls air from there instead although now in the summer that doesn’t seem like a great idea. I’ve seen balloons you inflate but I can’t imagine those defy physics of air pressure and temperature drops.
What’s the underlying problem? I can’t imagine I’m the only one with this problem and the House certainly isn’t as tight as the ones on this site.
We do have a pro range hood, and use only one bathroom fan each morning. Is it as simple as opening an attic window? Basement is uninsulated, and we have steam heat as well as split ac/heat pumps.
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