A Few Reasons Why Installing an Evaporative Cooler (or Swamp Cooler) in Denver Makes Sense:  Evaporative coolers work best in areas where the air is hot but the humidity is low – just like here in Denver.  It’s an extremely efficient and economical way to cool your home during the hot summer months. Evaporative coolers work by combining water evaporation and an air-moving device. Fresh air from outside is constantly pulled through damp pads where it is cooled by the natural evaporation process and there’s never a feeling of stuffy, stale air within your home. The energy savings are astounding compared to that of most air conditioning systems. Evaporative coolers are estimated to use as much as 90% less energy than standard air conditioners, allowing you to save money each month on your cooling utility bill. Using less energy results in decreased use of fossil fuels, making evaporative coolers an environmentally friendly choice.