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Dyson Purifier Humidify+Cool Formaldehyde™ PH04 - (White / Gold) - $800
$800
Dyson
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To start, the "air blade" technology that is supposed to move more air at a quieter speed fails to live up to that promise because of the way it replaces large fan blades with a corkscrew cyclone digital motor design at the base. This results in a distinct bothersome noise at low speeds like a quiet leaf blower or gaming laptop fan, as opposed to the low rumble of a traditional fan that people find pleasing. At higher fan settings it is straight up an electric leaf blower.
As far as air purification, they use fiberglass filters that are very expensive to replace and as it becomes clogged it bogs down the motor and leads to premature motor rattling / failure. I had to replace mine twice under warranty and they kept telling me that not replacing a $200 fiberglass filter every 6 months was the reason.
I have multiple PM2.5 meters and can confirm that it's very slow at removing PM2.5 compared to even a cheap $120 Winix filter from Costco. Nowhere close to the BlueAir models.
In terms of removing formaldehyde, I haven't seen any tests proving dyson's approach works or that their sensor is truthful (many formaldehyde sensors will also falsely read alcohol and essential oil vapors which then makes you think your air filter is doing an amazing job when in reality it's just natural dissipation of a molecule that easily escapes your house). The catalyst design is basically PECO and that's the same technology as Molekule filters, which has been thoroughly debunked as "academically a good idea but in practice you need a ridiculous impractical sized unit"
Now in terms of humidifying, it both says it can move 86 gallons of water a day AND says the 1 gallon capacity is good for up to 3 days. From my experience 1 gallon of water is laughable in terms of the impact on humidity of even a modest sized bedroom.
There's really no huge benefit to combining these 3 products in one. They need to be used in different circumstances, they each require their own unique maintenance, and for $800 you can get a top of the line model of each.
Again, I often am a sucker for Dyson products, despite their premium price tag and plasticky construction. But their fans/heaters/filters/humidifiers are really hard to recommend for any legitimate reason.
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