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Leaky duct
I was nosing around in my bedroom Techlink center, and noticed the AC duct had several holes in it. No particular reason for the holes other than old age, but I got some 7″ insulated duct at Home Depot and replaced the holy duct. In the process I took the AC filter out, and lo and behold, it looked like it had never been cleaned. Between taking care of the holes in the duct and a clean filter, the bedroom AC is doing much better! If you have an old Marathon like ours, you may want to check the duct.
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