During heating season, people are confined indoors with unusually dry air for extended periods each year. Humidifiers help to keep comfortable levels of moisture, and properly maintained levels of humidity are beneficial for your respiratory system. Whole-house humidifiers work like old-fashioned room humidifiers. They put moisture into the air, making harsh, dry air much easier to breathe. And whole-house humidifiers automatically humidify the entire home, no more carrying a humidifier from room to room, spilling water on the floor as you go.