The PolarCool 20” ZONE Portable Evaporative Cooler provides big airflow for any shop – large or small. This cooling system features a durable yet lightweight plastic housing. The heavy-duty water pump assures a lifetime of use, and shuts off automatically when the water level hits a low point. The integrated touchpad interface allows the user to quickly set the ZONE to the appropriate speed to assure maximum cooling. The evaporative cooling system draws the air over the wet surface and instantly drops the ambient temperature between 18 and 30 degrees F.