Also called swamp coolers, evaporative air coolers are intended to save you lots of money in the long run without damaging your bottom line in the short run. Not many tools in this world make such ideal solutions to serious problems. In this case, we’re economically handling still air and stifling heat, and we’re doing it in style. Then again, not many tools use something natural and easy like evaporation in order to achieve their end goal. Swamp coolers cool air the same way our bodies cool themselves off when we sweat. Sweat droplets evaporate and reduce the air temperature around our skin. It cools us off. Simple and effective.