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How an Evaporative Cooler Works

Nature's most efficient means of cooling is through the evaporation of water. A simple example is the cooling you feel when stepping out of a swimming pool- the water evaporates quickly from your body, taking heat with it. Evaporative coolers do essentially the same thing by drawing hot air through wet pads using a fan or blower. As water evaporates from the pads, it take heat from the air with it, resulting in up to 30 degree cooler air being discharged from the cooler.

Cooling Temperatures
An evaporative cooler will nearly always deliver air cooler than 80 degrees F. The chart below shows that an evaporative cooler will deliver 78 degree air under a wide variety of typical summertime climatic conditions.
In addition, the constant air movement created by an evaporative cooler lowers the temperature perceived by room occupants - called the "effective temperature" - by an additional 4 to 6 degrees below the "evaporative cooled temperatures" shown in the chart.
Finally, an evaporative cooler works best in the hottest time of the day. This is because relative humidity drops quickly as temperature increases. For example, a morning relative humidity of 60 percent at 75 degrees will drop to only 31 percent when the afternoon temperature reaches 95 degrees.

MasterCoolŪ Contractor™ coolers are the absolute best in the business. Featuring a range of cooling and energy saving capabilities. These coolers can be installed in a variety of ways, depending on your need, and can also be added to an existing air conditioning system.

City & State

Outside Temperature

Humidity

Evaporatively Cooled Air Temperature

Buffalo, New York

88

54

78

Los Angeles, California

94

38

78

Phoenix, Arizona

106

16

78