In areas with low humidity, regular air conditioners don't work very well. A simpler solution uses water evaporation to cool and humidify air. These are called evaporative coolers or swamp coolers and are used in homes all over the Southwest U.S. Air is pulled by a fan across a wet pad, which lowers the air temperature by 20-30 degrees, and provides much needed humidity as well.
We attend a week-long festival in the remote Nevada desert, where daytime temperatures climb well over 100 degrees F.In this situation, it is necessary to be completely 'off the grid', self contained, and self reliant. In order to remain comfortable, we made portable swamp coolers out of common materials, powered by solar panels, to cool our enclosed living spaces. They have also been used at home in more permanent installations to cool greenhouses. Additionally, they could provide temperature regulation to desert homes where electrical power is not available.
Step 1: Materials
36-44 gallon heavy duty trash can with lid
Evaporative cooler pad x 12 feet x 29 inches
Hardware cloth or chicken wire x 6 feet x 24 inches
Submersible 12 volt bilge pump x 1
1/2 inch irrigation tubing x 10 feet
1/2 inch T-connector for irrigation x 1
Automobile radiator fan or solar fan x 1
16 inch diameter HVAC tubing
Large drain pan
U-bolts x 3
Solar panel and deep cycle battery