What are the benefits of putting in a central humidifier? During heating season, people are confined indoors with unusually dry air for many months each year. Humidifiers help create the ideal humidity level and comfort, and properly maintained levels of humidity are beneficial for your respiratory system. Whole-house humidifiers work like your more typical room humidifiers. They put moisture into the air, making harsh, dry air much easier to breathe. And whole-house humidifiers add humidity throughout the house, no more moving a humidifier from room to room, spilling water on the floor as you go.