Try Ceramic Windows film to help the A/C units
We installed ceramic window film (Clear) on all front windows, including the windshield to almost totally eliminate the heat from the sun while driving.
You can apply same ceramic window film on side window, with or without tint, to help keep out the heat in the rest of the coach.
This also helps protect the interior from UV frying. we already replaced all the "fake leather" throughout the coach, as well as our curtains and don't want to that again anytime soon.
Vent covers over the original vents also help reduce radiant heat from getting into the coach.
I used a laser thermometer to check all around our coach for hot spots and addressed them as I found them.
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