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Pure Enrichment MistAire 4 Speed Evaporative Humidifier White: Quiet Bedroom Humidifier, No White Dust, 300-500 sq. ft.

Vornado Ultrasonic Humidifier with Flameless Light Touch Controls Auto Shut-Off Humidification: 5-Year Warranty, 15-Hour Run Time, No Filter Needed

HoMedics Total Comfort Ultrasonic Top Fill Humidifier: Cool Mist, 5 Settings, No Filter, 300-500 sq. ft., 45 Hr Run Time