Interesting water only cooler

This is an interesting build that basically uses water as a radiator like cooler (instead of the typical bucket cooler with ice).  Nice build, curious how well it works thought.

http://hackaday.com/2014/08/08/a-do-it-yourself-air-conditioner-with-evaporative-cooling-5-gallon-bucket/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+hackaday%2FLgoM+%28Hack+a+Day%29