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Originally Posted by plyndrty
Not a HVAC PRO, but my buddy does AC's for a living and I have worked on a few installs with him. I have a feeling that you are having a pressure prob because air use to flow out the hole that was behind the thermostat and I just caulked the shit out of it.
One problem causing that might be leaking duct work that is forcing air into the attic thus forcing into the wall crevasses...
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Interesting. This is driving me nuts. The wall on which the thermo is mounted is completely out of the normal ariflow route of the house. It's only an issue at my programmed setting of 68 degrees that I have this problem. And I agree with you it is a pressure problem. At different "forced" settings I don't have any problems, but anywhere under 70 or so I start to have the problem I am seeing here. I wouldn't care except that 68-70 is comfortable, but with a nearly 70% increase in gas prices where I live, I want to economise wherever I can ths winter, and the temps are already causing an issue.