Vornado provides whole room humidification. By incorporating Vornado's signature vortex technology, the Vornado Ultrasonic humidifier moves large volumes of harsh, dry air through the unit and then pushes the moistened air further out into the room, providing complete and even humidification. It also receovers and circulates heat off of the ceiling for even room temperature. Delivers cool or warm mist and has user defined settings that allow you to choose your desired humidity level and fan speed. The humidistat provides automatic humidity control large 2 gallon capacity makes for less refills. Provides coverage up to 1250 sq ft. 5 years limited warranty.