Levoit Superior 6000S vs Vornado Evap40

“What the other poster said is not true. You're breathing the white dust and it's composed of minerals. I don't know what you're reading that states that the 6000s requires a lot of maintenance but I'm on my third season with one. I have it set to dry the filters when the tank runs out, which takes about a half hour. Depending on whether you have V1 or V2 determines whether the tank needs to be emptied or washed. Six gallons of tap water. Only puts out water vapor, any minerals in the tap water run through the filters and winds up back in the tank.”

“Depends on what kind of humidifier. Ultrasonic humidifiers tend to be the cheaper options, but they do significantly increase PM2.5 because they will also volatilize the minerals in the water. Purely evaporative humidifiers do not (these are basically just a pan of water with a powerful fan), unfortunately they are often more expensive. I have a Vornado Evap40 ~$150 in the US. It has really helped us even with just the one in our two story house, and we don't typically have it on the highest setting. We have an Awair air quality monitor and it shows significant improvement in our humidity (but it needs to be run continuously), with no discernible change in PM2.5. When our friends were visiting and brought their ultrasonic humidifier, the PM2.5 was very high.”