By controlling the airflow (fan speed), the temperature in the building may be controlled. Since the supply air is not re-circulated, For maximum efficiency, doors and or windows should be left open while the swamp cooler is operating to allow hot air to be replaced with cooled air. This can also be accomplished with ducts or fans.

Because an evaporative cooler is continuously evaporating water, it naturally requires a water supply. In addition, the salts in the supply water don't evaporate, and gradually increase the salt concentration in the tank. The salts then precipitate out on the pads, causing water to drip onto the roof. To overcome this you need either a continuous bleed or a salinity meter and a pump-out valve.

Where water is high in mineral content, a bleed-off system often is used on the water circulation system, constantly dumping part of the water and allowing the refill valve to replace it with fresh water.

Here are some tips about maintaining your swamp cooler for maximum performance.

Filters ought to be replaced when they get built up heavily with lime or scale. Most blower motors need to be oiled at least once a year with a few drops of oil. Larger units that have a pulley-drive blower should be oiled at the bearings of the blower cage shaft, too.

For maximum efficiency, doors and or windows should be left open while the swamp cooler is operating to allow hot air to be replaced with cooled air.

-- Tips courtesy of HomeAdvisor.com