Buy Air-O-Swiss U600 Ultrasonic Humidifier

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List Price: $209.99
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I love this machine! My favorite feature is that it is quiet! All of my previous humidifiers were loud and gurgling. This machine is truly whisper soft! I love the dual directional feature on the top vents. The filter is a closed unit which does not encourage the growth of mildew I have seen on less expensive humidifier model filters. Filters are reasonably priced. The automatic self adjusting on/off humidity feature saves me trips to fill the reservoir. When the humidity is right, it turns off. I use this in the bedroom. I want to get another for my livingroom.

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Okay this is the third Air-O-Swiss Ultrasonic Humidifier I've owned. I've always been pleased with this company. I've bought ultrasonic humidifiers from other companies and they've never compared to the quality and performance I've always gotten from Air-O-Swiss.

I bought this one because it's more compact and has actual knobs instead of electronic buttons. I didn't want a lot of bells and whistles, just a basic unit.

It does put out a lot of humidity. No problem there. I usually run it on it's highest settings and it lasts about 8-10 hours. If I put it on it's lower setting it'll run 24 hours but puts out a lot less humidity.

Two issues with the unit.

1) It's hard to get the tank back in place after re-filling. I have to stand and fiddle with it and ultimately kind of slam it in place. Not a huge issue but kind of annoying when I'm ready to go to bed at night and tired.

2) When the water level gets low but not empty, say about an inch and a half or so of water left, the unit begins to turn itself off, then back on, the off, then back on... "click, click, click, click..." It's like it decides it's out of water, then it fills the reservoir back a little, then kicks back on for 30 seconds or so, then runs out again and kicks back off. Now this is annoying. Can't be good for the unit either. I keep mine upstairs in a loft, so when it starts clicking during the day, I have to go upstairs and turn it off as it drives me nuts hearing it click.

If I were to forget to fill it before bed, and it started clicking like this during the night, it would wake me up with the clicking. I am a light sleeper though.

Other than these things, it does what it's supposed to do and it don't take up a lot of space. I think this unit would be good for occasional use, for humidifying a sick kid's room and such, but for every day use I'm going to stick with one of the other units, like the Air-O-Swiss AOS Ultrasonic Humidifier 7135; I've never had ANY problems with that unit (except it's bigger and not very pretty)and have had it for several years.

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This is an expensive unit but it got good reviews and I have severe dry eye so I need to sleep in a humid room. Worked great at first. Then (after a short period of time) the beads in the filter started falling into the water unit. Replacement units are expensive and supposed to last several months-NOT! Then the light (green when full and working; red when empty) stopped working. Then it would only work on the highest settings. Then it soaked my floor. Add to all of that, all its little replacement parts are expensive and its very hard to fill. Since I had to fill it every day, that was a pain. I have a cheap Walgreens unit I bought a couple years ago. It just keeps chugging away. Wish I had another just like it instead of this expensive, hard to maintain piece of junk.

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I live in NYC and had no problems with white dust since the water here is soft. The only reason I've given 4 out of 5 stars is because i wish it could handle a little more water in tank. It works fine for about 8 hours though.

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I had a choice between the pricier all-electronic U650 and this mechanically controlled U600 and went with the U600 because electronic devices tend to fail. The U600 is just wonderful. During the warmer months, like now, I can go about three days between refills. During colder periods I turn the heating unit on. I can still go 24 hours between refills. It is one fine unit and it looks great. The workmanship is without peer and I would purchase the Air-O-Swiss U600 Ultrasonic Humidifier all over again.