Back on topic - I've spent much of the evening looking at videos on YouTube of Swamp Coolers, some of which are very ingenious. Essentially, they are all nothing more than mid-size cooler chests filled with ice with a small fan motor mounted mounted at one end on the lid, and an exhaust port at the other end. Some baffle plates inside would make them far more efficient by making the air travel over greater distances before exiting the cooler chest, but overall, they seem to work quite well and consume very little power in the process--especially those utilizing compute fans. Before heading to the sunny south for winter I intend to construct one, maybe as soon as next week. Should be fun, and if it works in Maryland's oppressive heat and humidity, it will work anywhere on the planet.
Here's one you may wish to look at: