When running on high, not so quiet. It sounds like a gas stove. I filled it 7/8 full, on high at 6:30 pm and came to bed at 12:30 am and the tank was already at 1/4 full. I don't think it will stay running for 12 hours on high.

The first one I bought thru Amazon & it was dead out of the box. I decided to give it another try, but bought it thru Best Buy this time. It worked for about 10 days and then it died. Returned it & got another and so far it has worked great for a month now.

If you are patient, and don't mind jiggling the unit to drop some water you will get results for a little while. Then jiggle it again, and it will work for a while longer. Also, this unit has a very small hole for the water to go into which is not compatible with my water source.

It Doesn’t work properly. It shows refill when there is full of water.

The humidifier was purchased due to the dry atmosphere of winter in our home. Works great!