Best Air Purifier For Allergies In A Bedroom: What To Compare

How big a purifier does a bedroom need?

The EPA publishes a sizing chart for portable air cleaners (read October 13, 2026). It pairs room area with a minimum clean air delivery rate, or CADR: 100 sq ft needs 65, 200 sq ft needs 130, 300 sq ft needs 195 and 400 sq ft needs 260. The chart assumes an 8-foot ceiling, so a taller room needs a higher CADR. Against that chart, the Levoit Core 300 (CADR 145 in our air purifier table, $89.99 on Amazon, Oct 13, 2026) covers a bedroom of about 200 sq ft with room to spare, and the Levoit Core 400S (CADR 259, $219.99) sits just under the 400 sq ft row. Multiply your room length by width first, then pick the CADR row that covers it.

Which purifier in our table is quietest for sleeping?

The Blueair Blue Pure 311i Max is the quiet pick in our air purifier guide. The guide lists 23 decibels on its lowest setting, a CADR of 250 and a price of $169.99 (prices read from Amazon on October 13, 2026). By the EPA chart that CADR sits between the 300 sq ft row (195) and the 400 sq ft row (260). The Levoit Vital 200S-P is listed at 35 dB on low, with a pollen CADR of 289, for $189.99, so it moves more air but is louder at its lowest setting. For a bedroom, compare the decibel figure on the lowest setting, because that is the speed a night-time unit runs at.

What does a bedroom purifier cost per unit of cleaning power?

Dividing each price in our table by its listed CADR gives a rough cost per CADR point (our arithmetic, prices read on Amazon October 13, 2026). The Levoit Core 300 costs $89.99 for a CADR of 145, about $0.62 per point. The Levoit Vital 200S-P costs $189.99 for 289, about $0.66. The Blueair Blue Pure 311i Max costs $169.99 for 250, about $0.68. The Coway Airmega AP-1512HH, our allergy pick, costs $229.99 for 246, about $0.93. Filters add running cost: the guide lists about 9 months of filter life for the Blueair. A unit whose CADR matches your room beats an oversized one you would run on high.