I am not sure if this would work for us out here in Alabama, or other people who live where there is a lot of humidity in the summer; but I can see it being something that would work in the drier climates, and it is similar to the idea for cooling that @Frank Sanoica showed us a while back. The basic idea is similar to what Frank did with the water, blowing cooled-down air into the house through a fan; however, this one also involves using one of the whole house fans, or one similar to that might work. What the person did was use a moisture-absorbing pad in a window, and the air cools as it is drawn in past the water-soaked pad, as the water is being pumped up to the absorbent pad and then dribbles down through it to be re-used. This air would add humidity to the house air if it stayed and was then recirculated; but this is where the whole houe fan comes in; because the fan sucks the hotter air up into the attic and out of the house; so there is always fresh cool air coming in . The video explains it much better than I can do; but this will at least give you an idea of what you are going to be watching him build and operate. He said his house is about 1700sqft, and it costs him about $12 per month o keep it cool uing tthis method.