Remember the chill after swimming on a hot, dry day, then getting out of the water and feeling the wind hitting your wet skin? Or simply try dipping your finger in a glass of water, then blowing air across your finger and feeling the cool sensation as the water evaporates. That’s evaporative cooling. Try the same thing when there is no wind or no air moving. The surrounding air is quickly saturated with moisture, there is no evaporation and the cooling effect is gone.

Evaporative cooling units create this naturally occurring process and provide a constant flow of cool, refreshing air into a hot, uncomfortable environment.

The heart of an evaporative cooling system is the pad where the water evaporates and the air passing through the pads is cooled. A special water distribution system spreads water over the surface of the pad, ensuring a uniform supply of water to keep the entire air contact surface thoroughly wetted. Fans create a negative pressure, causing air to be drawn through the pads. Evaporation results from contact between air and water. A control system operates the water pump and the fan distributes the cool air.

The relative humidity is lowest in the afternoon when the temperature is at its highest.  And the lower the humidity, the better the evaporative cooling effect. In other words, the cooling effect is best when you need it the most.