A/C duct leaking cold air

[Bashley]

I've got the whisper quiet(fully ducted) ac unit in rear. Our inside ceiling is cold and sweats on each side where the ducts make a transition (90 deg?). Not good. I obviously have poor cooling performance and wonder if anyone else has this problem. I'm afraid a section of ceiling will have to be removed to access the ducts.
FYI, my unit is a 3790 with the raised floor in the den area making it easy to reach the ceiling.

[Eagleback]

I do not have that system, but i had the same problem with sweat on the ceiling (South Florida) and found that they did not close off the cold air duct in the roof and i ended up using metal tape to seal off the duct area (plenum) from the roof area to keep the cold air from getting in the roof and causing sweat and dripping on the floor.

[phillyg]

I have the same system in a different model but don't experience sweating. I had a problem similar to yours in a Forest River, and it was caused by blocked ducting. You
might suggest to the dealer tech that you believe the ducting is compromised. A few people have had similar problems with the supply ducting. You can search on this site; maybe there're some similarities.

[mlh]

Like Eagleback said use medal tape not duct tape. Duct tape should not be used on ducts. It won't last.
Lynwood