WOW! Having grown up in Phoenix I can tell you that swamp coolers are, by far, the most cost effective way of cooling with high temps and low humidity. That said, they also need water to run efficiently. They will also put some humidity back into your coach and you'll feel more comfortable. Remember we are mostly water anyway. The misters are a great addition. However, in the Indio area I'd buy a water softener, if you don't already have one, and run the misters thru that so you prevent any water spotting on your rig. Home Depot sells portable swampers that you simply add water to. They also have table top models. It will be hot there and you'll be looking for Satan some days. That said, your bones will love the warm temps. DO NOT ALLOW THE COACH TO GET HOT. If you leave for the day and don't leave an A/C on, your coach will get very hot inside. Once that happens you can run all three a/c with little effect. BTDT.:E You'll have to wait til it cools down at night for the coach to cool off enough. Start the air in the morning and let em run all day. Expect to pay at least $100-150/mo for electricity.....Dennis