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 is rated for room sizes up to 650 square feet. 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 bacteria, 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 8-Gallon Humidifier (*est. $110) gets good reviews.

The most useful review we found for the Air-O-Swiss Ultrasonic 7135 humidifier is a professional evaluation from the Allergy Buyers Club website, 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. The 114 reviews posted on Amazon.com are the best source of owner feedback we found. Buzzillions only has one owner review at this time.