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One thing to look into is to examine if the hot air return is mixing with the cold air flow. On my Vegas when I took down the AC vent covers I found there was a foam block separating the the two airflows. The hot air return was being routed through two side vent and up through the front duct. The problem was that block was only being held in place by friction and got blown out of position by the difference in air pressure causing the hot and cool air flows to mix together. I solved the problem by putting the foam block back into position and taping it into place with reflective tape for duct work. There are videos on YouTube that explain how RV A/C's work, but none of them show the exact same configuration as mine because of the ductwork forcing the cold air through the roof and out of the vents in the bedroom and ect.
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