- How long does the tank last?
- At low output it can run through a night; at high output expect to refill it within a day. The 1.5-gallon tank is small for larger rooms.
- Does it have a humidistat?
- No. It mists until you turn it off or the tank empties, then shuts down automatically. You set the room's humidity by eye or with a separate hygrometer.
- Is it quiet enough for a bedroom?
- Yes. Ultrasonic mist is close to silent, and owners commonly use it in bedrooms and nurseries. You may hear a faint hum or water trickle.
- Does it produce white dust?
- It can if you use hard tap water. Use distilled or filtered water and clean the tank regularly to limit mineral dust and film.
- What rooms does it suit?
- Small to medium rooms such as bedrooms, offices and nurseries. For a large open space, a unit with a bigger tank and a humidistat works better.
- Do I need filters?
- No. It is a filter-free ultrasonic design, but it still needs regular cleaning of the tank and base.
- Where is the Optimus 1.5 Gallon Cool Mist Ultrasonic Humidifier cheapest?
- At Newegg, for $48.99, 30% under what the other stores charge, as of our latest check.
- Where can I buy the Optimus 1.5 Gallon Cool Mist Ultrasonic Humidifier?
- 5 stores we checked sell it, including Newegg, Best Buy, Shop Simon, Nordstrom, Lowe's.