After removing flooded flex-duct from crawl space I found that 14" dia duct attached to 12" dia heatpump ports. Should i increase the openings to match. Or leave it as is. Thanks.
I looked closer at the unit and can't enlarge. So I figured the over sized duct is a way to compensate for the reduced air flow rate using flex-duct.
I agree, it sounds like a non-problem.