I've been using this humidifier for about 2 weeks now and I have just a few comments:
1) It uses quite a lot of water. At full output, it will go through a gallon of water in about 7 hours. Trying to run it through only a portion of the day as well as during sleeping hours requires a minimum of 2 gallons of water. Considering that it is suggested to only use distilled water (approximately $.75 - $1 a gallon), this becomes an additional cost that I hadn't really considered of anywhere between $24 and $62 per month, depending on usage. Additionally, lugging home gallon jugs of distilled water every few days is a chore.
2) The actual humidity that it adds to a room is negligible. I am using this in a bedroom that is approximately 200 square feet. I am able to track the humidity in my house via several hygrometers placed in various rooms, and the average humidity in that bedroom hovered around 30-35% before the humidifier. Running this humidifier at full output, 24-hours-day, for 3 days consecutively only raised the humidity in the room (doors closed) by about 7-8% (yet the machine consumed nearly 10 gallons of water). I have cut its usage back to only running it during sleeping hours and in that 6-8 hour period it will generally raise the humidity by only 2-3%.
3) Because this is an ultrasonic humidifier, the mist comes out cool/cold. This causes the vapor to immediately drop to the floor, and especially in the winter when warm air rises and pushes cold air down. The bedroom where I have placed the humidifier is carpeted, and the vapor immediately falls to the carpet and is absorbed there, providing minimal moisture to the actual air in the room.
Overall this is a very minimally functional humidifier that produces negligible effects. I would only recommend this in small rooms (less than 200 sq ft), and in situations that do not require a dramatic increase in humidity. Additionally I would recommend utilizing a ceiling fan or perhaps small table fan to distribute the vapor in a more uniform way.
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