(picked up from another thread)
A.K.A. 'Swamp Coolers"
Evaporation coolers do not work well in high humidity areas, so not an option in most coastal areas or the US south. In arid-hot areas like Arizona, I've heard of homes installing mister systems indoors --the mist evaporates before it hits the floor!
BTW, I've been to Phoenix a couple of times ...don't believe that absolute bullshit about dry heat isn't hot.