The Vicks V3900 is a cool-misting evaporative humidifier designed for general home use. It features a bottom-filling water tank with a 4.8L (1.3 gal) capacity, providing a maximum runtime of approximately 28 hours. This makes it suitable for medium-sized rooms up to 400 ft². A key distinction is the inclusion of a UV bulb inside the tank to help prevent bacterial growth.
This humidifier is compact, easy to clean, and its long runtime means you can run it all day without the tank running dry. However, it lacks a humidistat and any smart functionality. This means you will need to manually monitor room humidity levels and adjust the mist settings or turn the unit off as needed. Pros: Long runtime. UV sterilization system. Compact size. Easy to clean. Cons: No automatic functionality. Capacity is a little limited for especially large spaces.