> in hot, arid climates. Swamp coolers, aka evaporative cooling, work great in these conditions and are very energy efficient. In hot, dry areas, this is a so

> in hot, arid climates. Swamp coolers, aka evaporative cooling, work great in these conditions and are very energy efficient. In hot, dry areas, this is a solved problem. How much energy would a passive solution save? Running a fan and a water pump for an evap system is light weight duty. A passive system for higher humidity areas would be a game changer.