What is Evaporative Cooling? 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.  Our 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 takes 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 climate 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 during the hottest time of the day.  This is because relative humidity drops quickly as the 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. Energy Savings An evaporative cooler consumes only one-fourth of the electrical energy required to operate a refrigerated air conditioning unit.  This means you can save up to 75% of your cooling costs on your electric bill! In fact, a typical whole-house evaporative cooler from Champion requires two small electric motors totaling between 1/2 and 3/4 horsepower.  A comparable refrigeration unit requires three electric motors with a combined horsepower of 3 1/2. Other Benefits With evaporative cooling, a complete air change occurs every 1-3 minutes.  This offers a great advantage over traditional refrigerated air conditioning, which employs a complicated “closed” system that constantly recirculates the same stale air. • Constant cool air movement pushes heat out – along with stale air, smoke, odors and pollution. • The high volume of fresh, cool air produced by the evaporative cooler helps your body ventilate naturally. • Evaporative cooling helps maintain natural humidity levels, so wood furniture and fabric fibers do no dry out prematurely.

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