Many people mistakenly believe they live in a geographic locale that is too humid and hot for an evaporative cooler (also known as a swamp cooler) to be effective. But the laws of physics dictate that as temperatures rise, relative humidity falls. In this case, evaporative coolers can be quite a bit more effective than spot coolers, portable air conditioners or industrial fans alone, especially if you are interested in keeping large living or working spaces cool.A review of weather data from hot weather regions shows that even in the most humid climates, midday relative humidity levels are well within the range where WayCool/Pro-Kool model evaporative coolers can provide relief from the heat. Daytime humidity levels tend to begin in the 90% range during the morning hours when it is cooler, but with 90F and above, it's almost impossible to have humidity levels above 70%.
temp. drop at 95F