Air-O-Swiss Ultrasonic Warm Cool Mist Humidifier Model 7147
Although this humidifier from Air-O-Swiss is certainly on the pricy side, it offers ultrasonic dual mist humidification that is good for even large rooms (up to 600 square feet). The Air-O-Swiss 7147 features a sleek, modern design, with more features than the typical humidifier. These include a built-in humidistat, a timer, sleep mode, and automatic temperature control to maintain the most comfortable humidity level relative to the temperature in the room.
The 7147 uses ultrasonic technology, making it exceptionally quiet with only a quiet humming detectable even at night. This humidifier also offers both warm and cool mist capability, as well as a replaceable demineralization cartridge to manage issues often be caused by hard water. The digital controls are easy to use, and despite being a bit more challenging to refill with water, the Air-O-Swiss 7147 humidifier should be a top pick for those seeking the least noisy humidifier they can find.