Reviews
Air purifiers and humidifiers compared on published, certified ratings: what each unit is rated for, what it is not, and which one a given room needs.
Units compared on what their makers publish and what the rating programmes certify, never on bench tests this site did not run. Where a rating is not published, the page says so.
Best air purifier for a bedroom and a living room: AHAM smoke CADR, ENERGY STAR and CARB listings sort eight units, and the room's square feet decide before any of them
AHAM, ENERGY STAR and CARB listings compared: Levoit Core 300 smoke CADR 143 for a 222 sq ft bedroom, Blueair 211i Max 435 for 674 sq ft, CARB types listed.
Best humidifier for a bedroom: the output, tank, humidistat range, wick interval and watts each maker prints, and why the ultrasonic Auto Mode runs past EPA's 50 percent line
Maker sheets compared: Vornado EV100 1 gal per 24 h, 40 to 60% humidistat, wick 4 to 8 weeks; Levoit LV600HH 300 mL/h, 280 W, Auto Mode 55 to 68% RH, past EPA's 50%.