About Evaporative Cooling

A cooling option alternative to forced air or heat pump systems, evaporative coolers can be used to effectively cool indoor spaces. Learn more about the process of evaporative cooling and how evaporative coolers work.
What is Evaporative Cooling?
Evaporative cooling refers to the natural evaporative effect that cools your body as air passes over your moist skin. Water evaporates, and is absorbed by the air as it converts to vapor. As evaporation occurs, it creates a cooling effect as latent heat from a surface is removed.
Where are Evaporative Coolers Typically Used?
Evaporative coolers are ideal for use in warm and dry climates. This sort of climate is typically found in desert regions of the country. Homes in the southwestern United States have the right conditions needed to make evaporative cooling effective.
evap. cooling locations
How Does an Evaporative Cooler Work?
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Evaporative coolers recreate this natural process to produce cool air, which is then distributed throughout the indoor spaces. This cooling process is very effective in dry, arid climates.  These cooling systems use damp pads to facilitate evaporation. Pads can be composed of a number of materials, including Aspen wood shavings or cellulose sheets.
The unit’s water distribution system consistently wets the pad to ensure enough moisture is available to produce the necessary amount of cooling. Water which collects in the system is recirculated for use wetting the pads. An evaporative cooler uses between 3 to 15 gallons of water each day, depending on environmental conditions.
A fan is used to draw air through the wet pad. As warm outdoor air is drawn into the unit, the evaporative cooling process takes place. As the air is cooled, the fan also works to distribute the cooled air throughout the home. Air is not recirculated, as with a forced air cooling system; instead, air is constantly being drawn from outdoors, cooled, distributed through the home, and expelled outside.
Balancing air flow is necessary to limit humidity levels. Incoming and outgoing air volumes must be equal. Balanced air flow can be achieved by opening windows or doors when the evaporative cooler is in use, or installing ducts to help direct the cooled air throughout the home.