Consider an Evaporative Cooler

As an energy expert based in Colorado, Weiner is a big fan of evaporative coolers. These are relatively simple systems that pass air through a water-soaked pad to cool it before sending it into your house’s ductwork. Because they add moisture to the indoor air, they are appropriate only for dry climates. The best thing is that they save a lot of energy. “An evaporative cooling system can be 75 percent more efficient than conventional AC,” says Weiner. “An additional benefit of evaporative systems is that some natural ventilation is not only ok, it’s actually required. You manage your comfort level by how much you open your windows.” With conventional AC, you never open the windows because it lets out the cool air and lets in humidity, which your system is working hard to eliminate.