What unit is up there. Think that it could be a defective A/C unit. I have a 33 ft Class C motorhome(realize apples and oranges) with a 15K unit(w/heat) - and it performs really poorly. Still does and yes - I missed my window to duke it out with the manufacture -> Dometic. On hot days, we were lucky to keep to 80 if when I rig was located with no shade. We ended up with a second unit(15K - not cost effective to go with a 13.5) in the back/bedroom that can almost cool the whole rig. I am waiting on the day that unit gives up the ghost to replace knowing the replacement will probably solve all of our issues.
2016 Forest River Georgetown XL 350TS
Ford V-10 (5-Star Tuned)