How exactly do evaporative coolers work?
An evaporative cooler adds moisture to the air by increasing relative air humidity and decreasing air temperature. Evaporative cooling occurs when moisture is added to air that has a relative humidity of less than 100%. The lower the relative humidity of the air, the greater cooling effect possible when moisture is added. The technology used in evaporative coolers is a versatile and energy efficient alternative, adjunct to compressor-based cooling. In favorable climates (most of the western United States and other dry climates worldwide), evaporative coolers can meet most, or all, of a building’s cooling needs, and they only use one-fourth the energy of conventional equipment. Evaporative coolers can also be cost-effectively integrated with conventional chiller systems.
