Best Warm-Mist Humidifier

Air-O-Swiss S450 Steam Humidifier

Like a standard warm-mist humidifier, the S450 boils water to create steam. Unlike most, however, its vapor cools slightly before it escapes, making it safer. A set of controls offer a manual and an auto setting, as well as a decalcification mode, which helps keep the unit clean. An included mineral absorption pad reduces scale buildup and helps make weekly cleanings much easier. There's a fragrance container, too: A few drops of peppermint oil cast a pleasant aroma across the 860-square-foot coverage area. [$260;]