We just had a Carrier central AC installed (just AC with indoor air handler) and have a lingering odor present in the two rooms with exposed ductwork. The odor started during install, before turn-on, and smells rubbery or "fish" like. It's been almost 2 weeks and running the AC does not help. The curious thing is that there is no odor in the duct outlets, or other rooms, which are air-conditioned. Could duct lining in the return, or duct sealant be causing this problem?
I am pursuing this issue with the HVAC company (a well respected one) but would appreciate any expert opinions.