I'm just getting started on a quest for cool
I've installed the Go Power 480 watts solar setup with the 3000 watt inverter, and will soon order Go Power's 120 watt portable panels for a total of 600 watts of solar panels. Ours is a 2004 Winnebago Sightseer 35N. My goal is to boondock without running the generator so no AC either. What I do have is a Bonaire portable evaporative cooler that draws 1.3 amps an hour. When I put 2 or 3 frozen water bottles in the cooler's water reservoir it does a good job during the day and an even better job at night.
That said, I'm not in what I would term as a 'dry' climate. I'm in Oklahoma where it's humid, still, if I set the Bonaire in front of one open bedroom window, and open the other window as well, that sucker will put out some cool sleeping air all night long. This is awesome for us because the generator, among other things, is under the bedroom. If that's not bad enough, my Mrs. has reached that age where she is fine one minute and burning up the next
Beyond that I learned a valuable lesson long ago, happy wife = happy life.