A two-stage evaporative cooler is a newer, more efficient evaporative cooler that uses a pre-cooler, improved evaporative pads, and a more efficient motor. The pre-cooler cools the incoming air, with a water-cooled heat exchanger, and without adding any moisture to...

Let's think about the possibility of electrical-grid failure, unaffordable electricity, or AC failure during very hot weather. Ancient ideas and their modern designs may be one solution. Modern wind-catchers, along with wind-powered and solar-powered ventilators can...