Holmes Cool Mist Humidifier Ultrasonic HM495-UC

The Holmes Cool Mist Humidifier Ultrasonic HM495-UC gets average reviews from users. Read here for full product information, along with consumer and expert reviews. See if it's the best for you.


  • Runs up to 24 hours per tank filling
  • Measures 11-3/4 by 10-7/8 by 17-1/6
  • Weighs 7.2 pounds
  • Virtually silent ultrasonic operation
  • Adjustable mist output manual control
  • Quiet fan to help propel moisture into the air
  • Auto shut off when tank is empty, but fan keeps blowing to dry the reservoir
  • Recommended for medium sized rooms
  • Sleek design

Consumer reviews.

Users give this unit an average of 3 stars. On the positive side, many say for the money this is a good humidifier. It is very quiet, with a hum when on high. It is easy to fill. It makes a good difference in the humidity of the room. Users feel better with less dry eyes, skin, nose while it’s operating.

On the negative side, some report a lot of white dust. This happens with any ultrasonic machine, so you need to buy a demineralization cartridge or use distilled water to reduce the white dust. Some reported it didn’t work very long and broke within a few weeks or months. This can happen to any electrical machine, so keep your receipt.

Expert review.

For an ultrasonic unit, this has the basic features. One nice addition is the fan to help blow the moisture around the room. It is not very powerful, but it is quiet and offers some help. A bonus of the fan is that it keeps blowing, even when the ultrasonic mister stops because it's out of water. This helps the reservoir dry and keeps down bacteria.

Also, it is great that it can operate up to 24 hours per filling when on low. When it’s being used 24 hours a day, it’s no fun to refill these units more than once a day. Because it is quiet, this could be a good unit for the bedroom.

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