With humid air crawling up your walls, few things can make a home so unpleasant. Whether your house is damp, or your humidity comes from indoor cooking or drying laundry, the result can be a dreaded musty smell, mold growth on walls, and an increased risk of respiratory illness. Fixing a major moisture problem can take time, so what do you do in the meantime? One solution is to buy a portable dehumidifier, an electronic device that removes moisture from the air. In this article, we will introduce the working principle of dehumidifier.