Lazermonkey, no, it's not, this is straightforward evaperative cooling. And;
Sue, yeah, I would imagine it is QUITE different, the box, rag, and tub of water setup will give you an enclosed area that's 5-20 degrees cooler than the outside temp., depending on shade, or lack there of, amount of breeze blowing, size of the container, etc. It's not a refrigerator, but when it's 90 degrees+, you'd be surprised what a 15 degree temperature change will do for butter, cheese, your drinking water, or a beer, just to name a few <img src="/images/graemlins/wink.gif" alt="" />.

Troy