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Humidin evaporative coolers are available with two types i.e. Single Skin and Double Skin.The corner sheet metal is of cast iron with no insulation while double skin has PVC with Puf insulation thats CFC free. Working Principle A natural and energy-efficient means of cooling can be provided by evaporating water into air, specially, in low-humidity areas. This very principal is used in the evaporative coolers, i.e. cooling outdoor air by passing it over water-saturated pads, causing the water to