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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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