Swamp coolers are used all over the world. In order to work, swamp coolers need a hot dry climate. In the U.S., they work well in the arid western and southwestern parts of the country.

Where is evaporative cooling the most effective?

Evaporative cooling is most effective when the relative humidity is on the low side, limiting its popularity to dry climates.

Do swamp coolers work in the South?

Portacool evaporative coolers CAN drop the air temperature up to 30°F when the air is very dry such as arid climates of the Southwest where relative humidity is typically 30% or less. That said, even in hot and humid areas such as Houston, you can still expect to achieve a 10°F-13°F drop in temperature.

Where are swamp coolers used?

Swamp coolers are prevalent in warm, dry areas, such as Utah, Nevada and Arizona, where theres less moisture in the air, and evaporative cooling can work by adding moisture in the air.

Do you expect a swamp cooler to be more effective in Florida or Arizona Why?

The reason that swamp coolers are a good match to low-humidity areas like Phoenix is because they work through the principle of cooling the outside air by moving the air across water-saturated pads. (Plus, it adds more moisture to the air, and thats not what somebody living in a humid place like Florida would want.)