The 35+ Best RV Must Haves Told By Seasoned RV Owners
DIY AC. This is really easy to make and would help keep the room a lot cooler in the early and late parts of the year. You don't have to have bagged ice in the center either, ice packs or a frozen gallon of water work fine.
Handy Small Fan & Mini Air Conditioner ($37) is the closest thing to a handheld portable air conditioner you can get. A damp sponge inside the plastic container cools air to 30 degrees F, and the fan runs on a USB plug or batteries.
5 Gallon Bucket Swamp Cooler DIY Project - Cooling your tent or van. The basic idea for the bucket cooler is just a smaller version of Yellowdog's cooler made from a rubbermade garbage can. An evaporative cooler will reduce the temperature by 20 to 30 degrees. All the ideas that people came up with on this thread are a perfect example of radical self relience! (Bravo!!!)