Air-O-Swiss Ultrasonic 7135

Both professional reviewers and owners praise the Air-O-Swiss Ultrasonic 7135 humidifier for its ultra-quiet operation, solid construction and advanced features. It outputs up to 3.5 gallons per day and is rated for room sizes up to 650 square feet. The tank holds 2 gallons of water. This model produces either warm or cool mist and comes with a hygrometer and digital LCD display that allows users to preset and control the humidity. An ionic silver stick prevents bacterial growth, and a demineralization cartridge helps minimize white dust. However, reviewers note that softened water will produce dust, and distilled water may be necessary to eliminate the problem. Some owners also complain that the humidity readings are inaccurate and that the tank is cumbersome to refill. Still, this Air-O-Swiss model leads its class because of its high quality. If you don't want to spend so much, the cool-mist Kenmore 15408 (*Est. $110) gets good reviews and provides coverage for a larger area, but it is louder.

The most useful review we found for the Air-O-Swiss Ultrasonic 7135 humidifier is a professional evaluation from AllergyBuyersClub.com, which provides a comparative rating as well as short appraisals of its basic features, cleaning needs and parts. There are also detailed lists of the humidifier's features and specifications. About 150 reviews posted on Amazon.com are the best source of owner feedback we found. Buzzillions only has one owner review at this time.