Another thing to consider, a RV sitting closed up in the sun can get much warmer inside than the outside air. On a 70 F day, mine will heat to more than 100 F if closed up. On a 100 F day, it is possible to walk into a 140 F to 160 F oven, RV sitting closed up in sunlight.
So the first step in cooling one down, no matter how hot outside, is to open all the windows and turn on the vent fans, replacing the 140-160 F air with 90-100 F air. Then the A/C is starting out cooling 90-100 down to 70-80, rather than trying to cool 140-160 down to 120-140, then 100-120, and so on in very gradual stages. Just like when you get into a car that's been setting in the sun, you open the windows and move to blow the hot air out, before trying to cool it with the A/C. Or maybe people don't do that anymore.
