Check out the 2055 review on Amazon before you buy this thing
For details, including photos of the internal workings of this evaporative humidifier, look for the 2055 AirOSwiss reviews done elsewhere on Amazon which has plenty of images of the inner workings. To summarize, it's an evaporative humidifier which works by drawing air in through the top via a fan then over a disk pack of about 10 slowly rotating plastic disks which dip into a pool of water, then the air exits the side carrying the humidified air.
Pros: No heated element to worry about overheating when it runs dry, no ultrasonic misting to leave water droplets on carpet/furniture, easy to clean, no filters to be replaced, and it traps air particles on the discs with the water so it does 'wash' the air.
Cons: Evaporative which means it cools (fine for the desert country, not so good in winter in the Midwest), no heating, and the fill valve on the water tank is the stupidest location you can imagine, so that at best you can fill it only 3/4 full.
The other...
A quiet and solid performer
If you are in the market for a humidifier and are willing to pay a premium price the AOS 2055A merits serious consideration. If you are primarily interested in air purification you should look elsewhere; while air washers do remove a small percentage of large particles from the air (the rotating disk sweep some particles out of the air) they don't have the flow rate needed to compete with a good HEPA filter and they don't remove the full range of particle sizes a HEPA filter will. Additionally, a good HEPA filter will capture 80-99+% of the particles that enter the system (depending on the quality of the device) whereas there is no guarantee that a particle entering an air washer will make contact with one of the rotating disks. The primary benefits of the rotating disk design don't come from air purification but rather from the increased surface area available for evaporation that permits a smaller and quieter fan to be used in their design. Also, the action of the rotating disks...
Great Humidifier
Purchased this about 5 years ago (or similar model with rotating discs and digital humidity reading) for about $350. As far as I can tell, this is the best humidifier on the market. Tried a few other models including heating element, ultrasonic. wick, and this is by far the best. Have run it almost non-stop in the winter for a number of winters, and also ran it a little bit in the summer if my room gets too dry with the air conditioners in a former apt that had underpowered AC. It has kept my room at about 40 percent year round. Like any other humidifier - you can't have any drafts coming in from outside or a window open in the winter or it won't help you much.
It has had NO problems over the last 5 or so years. It is also very energy efficient and quiet and looks nice. The ultrasonic humidifier created too much white dust for me, and the mist could damage furniture. A wick humidifier caused some water damage on a floor after it cracked open.
You do have...
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