[SteveandTerri]

I wonder about that and collapsing return ducts. When I first got the rig, the AC hardly worked at all. I found a thread that talked about the return air ducts collapsing near the return air grills. I checked my return air ducts - and sure enough - they had collapsed to about half their normal size. I installed plastic tubes in the return air ducts to expand them to their full size (as recommended by many on the thread) and the AC system then worked fine. When the ducts were collapsed, there wasn't enough airflow through the evaporator coil and (I believe) the coil was icing up. I know another couple that bought a 2018 HC: they found and fixed the same problem.