An air dryer is a device that is used to remove moisture from the air in a room or enclosed space. This can be useful in a variety of applications, such as preventing the growth of mold and mildew, improving indoor air quality, and protecting electronic equipment from damage caused by moisture. There are several types of air dryers available, including desiccant dryers, refrigerant dryers, and heatless dryers. Desiccant dryers use a material, such as silica gel, that absorbs moisture from the air. Refrigerant dryers use a cooling process to condense moisture from the air. Heatless dryers use a combination of desiccant and refrigerant technology to remove moisture from the air.