A humidifier is a device that adds moisture to the air in a home by releasing water vapor. The increased humidity can help relieve dry skin, sinus congestion, and other respiratory problems. Humidifiers are also known to help to reduce the occurrence of colds and flu. Humidifiers are especially recommended for cold winter days when the furnace runs almost continuously, producing dry heated air. Dry air sucks out the moisture in your home, damaging wooden doors, crown moldings, floors, and furniture. In other words, an absence of moisture in the air can ruin your home and your furniture, not to mention your health. The most effective way to avoid or minimize such damage is to address the humidity levels in your home with the help of a humidifier.