Air-O-Swiss Ultrasonic 7133

Professional reviewers recommend the Air-O-Swiss Ultrasonic 7133 humidifier for being reliable, near-silent and easy to clean and maintain. Experts also cite its antimicrobial silver stick, compact footprint and ability to generate either cool or warm mist. This Air-O-Swiss humidifier outputs up to 3.5 gallons of water per day and has a two-gallon tank capacity. Owner evaluations focus on its quiet and effective operation over the rated area of 600 square feet, though a few complaints arise about its durability and the generation of white dust. If you don't mind some noise, the Kenmore 15408 (*Est. $110) also receives favorable reviews and can humidify a much larger area.

AllergyBuyersClub.com has an expert evaluation of the almost-identical Air-O-Swiss Ultrasonic 7135 humidifier that's the best review we found, giving it an overall rating and detailing its main features. An article on its sister site, AllergyConsumerReview.com, provides an additional comparative view of the Air-O-Swiss line. A brief expert review is also available from ConsumerGuide.com, though there's little evidence that the humidifier was actually tested. For owner evaluations, Amazon.com offers a range of opinions with about 30 reviews, while Buzzillions.com features about a dozen mostly positive reports.