Hey, heres one for you all! Can anyone give me a clue as to why 12 seer and higher units tend to sweat profusely when installed with existing ductwork! This has become a very serious problem for the company I work for, even to the point of changing out AHUs due to the fact they are saturated with moisture! Everyone seems to think increasing return size is the answer, but I tend to disagree, as I believe it will throw the balance of the entire system off, and cause even more sweating to take place! If anyone has a cure for this situation, I would really appreciate any advice you could give me! I am at my wits end with this one! Thanks, Ron!