What are the benefits of putting in a central humidifier? 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 distribute moisture into the air, making harsh, dry air much easier to breathe. And whole-house humidifiers help make the whole house comfortable, no more carrying a humidifier from room to room, spilling water on the floor as you go.