With 80 degree outside temps or higher you need to keep the door closed...kids are either in or out once. All awnings out for shade, window blinds down to block the sun and reflect heat, in addition to the A/C use a couple of portable fans to help circulate the air throughout the RV.
Once we convinced the kids to stay outside instead of going in and out our RV got so cold we had to change into long pants.
If we know the temps are going to be above 70 we start the A/C in the morning so the RV stays as cold as possible throughout the day.
We like it cold... our friends always say we could store meat in our RV and House.