It's cool that they're tackling problems in the developing world, but it's nothing revolutionary. Evaporative cooling only works in places with low humidity, a

It's cool that they're tackling problems in the developing world, but it's nothing revolutionary. Evaporative cooling only works in places with low humidity, and their design requires low ground temperatures and a substantial amount of installed infrastructure. It might be cheap enough and practical enough for locals to install themselves in the places where the low humidity and cooler ground temperatures would allow it to work. But if you put this device anywhere between say 35 degrees north and 35 degrees south it probably won't work very well because the average ground temperature will be too high.