The Dyson PH03 has just fallen to $500, which is Amazon’s lowest-ever price. That’s almost half its original price of $950. This model purifies, humidifies, and cools in a single machine, using a fully sealed HEPA H13 filter that captures 99.97% of particles as small as 0.3 microns. Water passes through a UV light before it’s released as mist, addressing the mold and bacteria buildup common in standard humidifiers. The one-gallon tank runs for up to 36 hours before it needs a refill. Shipping is free for Prime members.  Buy Now at Amazon