Off grid people... check this out

[zion-diy]

Alright, not just off grid people. even Rv boon dockers and on grid people can use this to help reduce your energy bill. This thing is amazing. 
And, so easy to make.

http://www.thegoodsurvivalist.com/how-to-make-a-454-homemade-air-conditioner-for-about-15-this-is-totally-awesome-and-so-easy-to-make/

[Adam Roby]

Hahah... too funny.  This might also be good for people with no air conditioning in their cars...  would beat having a window open when stuck in traffic.

[John Raabe]

  The hidden magic here is ice. You can easily make cool air if you have ice.
But there is no magic energy savings to be found by freezing water and then melting it to cool air.

[JRR]

When I first started watching this video, I thought it was going to be another variation of an "evaporative cooler", or "swamp cooler" as some call them.  So, instead of a frozen gallon of water, just dump in a gallon of tap water ... and perhaps a half-submerged bath towel, to act as a wick ... the same bucket, liner, and fan should give impressive results.  That is, if the humidity is low enough for good evaporation ... and it usually is.