Refrigerated air dryers use Freon to lower the temperature of compressed air, which condenses humidity into water, eliminating it, and creating a 39 degree F pressure dew point. This guarantees no condensation will be present at the point of expansion at your tools & pneumatic devices. By removing moisture overall maintenance costs are lowered by 15-25%, meaning less downtime and assuring high-quality products. With the addition of a properly sized pre-filter, dryer life will be extended and the added cleanliness of the compressed air will insure much longer life of your tools and pneumatic devices.