Industrial air coolers are also referred to as industrial swamp cooler or industrial evaporative cooler. They are used to provide large-scale powerful cooling in factories, huge indoor spaces and outdoor areas. Such systems are also used as a cost-efficient cooling solution in dry climate regions. Industrial air coolers are meant cooling for large open and semi-open spaces. They work on the principle of evaporative air cooling, wherein fresh air is supplied continuously through air ducts and air supply outlets and cooled through cooling pads and water. A portable cooler is also called a ventless cooler. The only requirements are access to an electrical outlet and a water supply. While traditional air conditioning operates in a sealed and insulated environment, these units simply need a steady supply of fresh air.