I think my installer is lost on this one, See the thread below on Dumb Carrier 58cvx question and/or my posts from the summer when my Infinity system was installed. I think at this point I am going to have to pay to get a 2nd opinion from somebody who REALLY understands ductwork. Can anybody give me a referral in the Southern CA area (Orange County). This has just gone out of control. I don't know what else I could have done as a HO to avoid this, but at this point I am not going to have someone continue to guess.