So, what do you expect from your rig AC? We have a 13k BTU AC in the front/master and a 15k BTU in the living. At present, the main 15k AC is keeping the rig at 10-12 degrees lower than the outside...
I feel the heat and humid weather way before my wife,So being our 5er has a 15k in the rear and a 13k in the bedrm..We start running the ac as soon as the the outside temp gets to 78. Doing all of the above helps but we bought 2 large fans- one in the livingrm (pedestal type) and the other for the bedrm, and wow do the 2 fans make a big change in how much ac you need to keep cold