Best Ultrasonic Humidifier

Vornado Ultrasonic Humidifier

Rather than heating water, this humidifier uses an ultrasonic frequency to bust it up into microscopic particles. Then a fan kicks in to blow the resultant mist far enough to cover up to 900 square feet. An LCD screen displays speeds and levels, which are easy to toggle between. Replacing the mineral cartridge regularly helps fight scale, but you'll still need to clean the unit throughout the season. At 18 inches, it's the tallest in our group of top units and has a two-gallon tank that lasts roughly four days. It doesn't gurgle or hiss like others we tested. [$190; vornado.com]