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Home > Air Conditioners > Evaporative Coolers > Portable Evaporative Coolers

Portable Evaporative Coolers for Sale at R.E. Williams

Portable evaporative coolers are a unique alternative to traditional air conditioning units. These systems push outside air through moist pads, where the air is cooled by evaporation. Then, a large fan blows the cooled air into the room. Evaporative coolers, or swamp coolers, are less expensive to run than air conditioning units. They can lower air temperatures by as much as 30 degrees. However, evaporative coolers are only effective with a relative humidity of 30% or less. When humidity increases, the systemsí ability to cool air decreases. If you live in a dry, arid region, try our 24 inch variable speed direct drive portable evaporative cooler. This model contains up to 900 square feet of cooling power in a convenient size! Purchase this product along with our 80 gallon portable water tank, eliminating the need for a water hose and supply line. Find these evaporative cooling products and keep your home up to 30 degrees cooler.


The process of evaporation happens all the time. Our bodies, for example, perspire in hot weather; through evaporation the sweat dries and drops our body temperature.

Whenever dry air passes over water, some of the water will be absorbed by the air. That's why evaporative cooling naturally occurs near waterfalls, at rivers, lakes and oceans. The hotter and drier the air, the more water that can be absorbed. This happens because the temperature and the vapor pressure of the water and the air attempt to equalize. Liquid water molecules become gas in the dry air, a process that uses energy to change the physical state. Heat moves from the higher temperature of the air to the lower temperature of the water. As a result, the air is cooler. Eventually the air becomes saturated, unable to hold more water, and evaporation ceases.

Evaporative Cooling Chart - Typical Results With Evaporative Cooling, based on outside temperature and relative humidity.  Note:  The higher the relative humidity the less temperature drop from the evaporative cooler:

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