We moved to a condo building 10 years ago that does not have humidification. We have tried 3 kinds of humidifiers, this one is BY FAR the best humidifier, the others pale in comparison in many ways. My only regret is it took me so long to find it. I can count on one hand the number of product reviews I have ever written, so I feel pretty strongly about this product. I purchased 2 Vornado fans years ago and they still work, so I know Vornado is a quality company. The top reasons for the 5 stars: 1. It provides humidification as advertised. 2. It is easy to fill, and the large capacity means I usually fill one side every day. 3. It is SUPER EASY TO CLEAN!!!!!!! 4. The filters last just about a month and are reasonably priced. PLEASE don't discontinue this model.

I was getting a bloody nose from how the dry air was in our new house. I bought a regular humidifier at the hardware store, but that wasn’t making a dent. The problem is that both my office and our bedroom were upstairs and had tall ceilings. It just couldn’t put out water fast enough, esp with the heater running. Then I bought the Evap40 and was shocked that it got the relative humidity from 35% to 48% in just a couple of hours. More importantly, it stayed there, even after turning it down to low speed. It does make a glug-glug noise at night, but it’s totally worth it to end the bloody nose. Highly recommend.

Running wide open the Vornado Evap 40 raised the humidity by about 20% throughout our 1600 sq ft home. The twin water tanks are easily removed and can be filled quickly from a hose.

It took me a couple of days to learn and adjust, but then I got the unit to keep the humidity of the room within a 10% RH range: 42 to 52%. The unit does not allow a more precise or consistent humidity setting, but it does a good job of keeping the room within this range provided the outside weather is not too cold driving more heat and hot / dry air into the room. Then the unit may struggle to keep up, even though the room it's controlling is only about 250 sq ft. I like the two 2 gallon water containers which are easy to fill and replace back in the unit. Overall the unit is a very good value.