Evaporative air conditioners draw in outside air, which passes through filters that are constantly soaked with water. The air loses its heat through the natural evaporation process as it passes through the filters. This cool air is then sent inside the building and cools the entire building.
The fan and a small water pump are the only energy consuming components of an evaporative cooler. Evaporative, or adiabatic, cooling uses up to 90% less energy than conventional cooling . It provides 100% fresh outside air and uses no refrigerants, which are highly harmful to the environment.