tldr; The bedroom workhorse. True HEPA, 214 sq ft coverage, whisper-quiet at 22dB. Best small-room value.
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Best praise vs top criticism for Coway Airmega 150
“Coway is one of the best consumer-grade brands. Per the [AHAM 2/3 rule](https://www.reddit.com/r/AirPurifiers/comments/1jxgjwf/sticky_purifiers_and_dust_reduction/), Clean Air Delivery Rates (CADRs) should be a *minimum* of 2/3 of a room's area (assumes an 8 ft. ceiling height). Even higher CADRs may be needed if you have allergies or pollution levels are high. The [Coway Airmega 150](https://cowaymega.com/products/airmega-150) has a top Smoke Clean Air Delivery Rate (CADR) of 153 CFM. For your 210 sq. ft. room, you would need to run the Airmega 150 on the highest airflow speed/setting only to achieve the listed CADRs. A 300 sq. ft. room (8 ft. ceiling) would need minimum CADRs of 200 CFM. For this room, the [Coway Airmega 240](https://cowaymega.com/products/airmega-240) could be a good fit as its top Smoke CADR is 282 CFM.”
“keep in mind that multiple smaller air purifiers are generally better than one super large one. i've heard round air purifiers aren't as good as "block-y" looking ones (the round ones have cylindrical filters that don't work as well). avoid ionizing/bipolar purifiers, as these produce ozone. i think the coway airmega 150 is on sale (just bought another one for me; have had one already for a year). one of those would probably be good for the dimensions of your living room, though idk how much bigger your kitchen is. but def wait for other people's responses too; they may have different experiences! sending good vibes to your baby!”
482 Reddit opinions analyzed • Last updated 2/24/2026