As usual there is a lot of confusion on how a RV air conditioner works. It is simple the inside air is pulled through the return, cooled by the evaporator coil and then returned through the discharge outlets. It is the SAME air only cooled. There should be somewhere around a twenty degree difference. If the inside air is 100 then the discharge will be somewhere near 80. As the inside temperature falls to say 80 then the discharge will be bear 60 maintaining the same difference. It is not complicated.