On hot, dry days, sometimes all a person can think about is finding a way to cool down. In naturally dry, desert like areas there are multiple, commonly practiced methods implemented in order to stay cool. One method that most are familiar with is a cooling unit. A swamp cooler, or evaporative cooler, is a machine that generates cooler air by a process known as evaporation. Evaporative cooling is a natural phenomenon in which a liquid such as water evaporates, and the subsequent evaporation is then released into the surrounding air, thus cooling the object or person in contact with that surrounding air.

An air mover cooling unit cools by using latent heat to evaporate the water to cool the air. Is seems ironic that it takes heat to cool an area down, but a similar phenomenon works the same way in order to cool down- sweat. When a person exercises, the heat created from the work out causes the body to release water (sweat) in order to cool the person down.  The cooling unit uses its power source, usually electricity to stimulate this natural process to occur.

This tool is a relatively large unit, but it is so because it can cool down much larger areas. It is really convenient to use such a unit to cool because generally most of them are on wheels and can be easily moved to different areas with little to no effort at all. The maintenance on these types of coolers is low also, and any parts that need replacement are not hard to complete yourself.

An evaporative cooling unit is commonly used to cool down large buildings for thermal comfort because it is relatively inexpensive to operate for long periods of time and it requires less energy than many other forms of cooling. However, evaporative cooling requires a much larger water source as an evaporate, and works at its best when the climate has a relatively low humidity level, which lowers its maximum effective use to dry climates.

Evaporative cooling units are colloquially referred to as swamp coolers in the U.S.; in other places they are best known as desert coolers. Either way, they are basically the same type of unit.

Another natural occurance that a cooling unit works similarly to is the process of stomata. Stomata is a phenomenon that happens on earth involving trees. Trees naturally transpire large portions of water through the pores in their leaves, and through this process of evaporative cooling, forests interact with the climate at local and global proportions. This