Review of Air-O-Swiss Refurbished U650 Ultrasonic Humidifier - 2 Pack

Customer Ratings:

Two units were delivered, one without the filter as attached to the cap. Without the cap the unit is totally useless. Please send me the cap with the filter!!!

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I have the AOS 7147 and of course these two AOS U650 units. I run them in the same room that is slightly bigger than the 650sqft that they can handle alone. The first thing that I noticed was that when turned on they both read completely different humidity levels. Sure, they were on different sides of the room but they were drastically different (i.e. 15% vs 40%). After running them for a while they seem to equalize out.

What I find super annoying about AOS (maybe ultrasonics) is that you have to clean them almost every week. to do this you generally have to unplug them and take them over to a sink and put the EZ-CAL solution in the bottom tray and let it soak. This is incredibly annnoying doing this that often, especially when you have multiple units (in my case, three two in one room, one in another).

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I love the fact that these humidifiers regulate themselves. There are many options you can set the humidifier for a certain period of time or it can run all the time until the room gets to a desired humidity. The only thing that I don't like about these is when you remove the water tank, a good amount of water spills out. Just have a towel handy to wipe down the surface that the humidifier is on. Other than that, these humidifiers do the trick.