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My reviewCADR (cfm) on maxCADR (cfm) on mediumTarget room size (sqft) on mediumInitial priceAnnual operating costs (24/7 on medium)Total annualized cost over 5 years (24/7 on medium)Annualized cost per sqftAnnualized cost per CADRNoise level (db) on mediumReview linksTotal cost over 5 years (24/7 on medium)Electricity (W) on mediumElectricity annual $Filters replacement duration (months)Filter replacment costFilter replacement annual $Noise level (db) range on low-highFilter type
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Clean Air Delivery Rate (CADR) for smoke. This should be listed in the product description. This is the rating for max fan setting.Estimated - the medium speed is typically around 60-70% the CADR of max.4 ACH on medium, with 8ft ceilingsCan vary based on stock and discountsThis is the cost- effectiveness. Using total cost over 5 years. This is the cost- effectiveness. Using total cost over 5 years. Most are HEPA or HEPA-like, but really any high-quality filter MERV-13 or higher works well. You should pay attention to CADR, not filter efficiency.
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Coway AP-1512HH MightyBest all-around240156293$180$45$74$0.25$0.4739https://www.nytimes.com/wirecutter/reviews/best-air-purifier/$3708$10.0812$35$3524.4-53.8 dBTrue HEPA
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IKEA FörnuftigGood for small rooms; good budget pick82.44993$70$27$39$0.43$0.80?https://dynomight.net/ikea-purifier/$1976$7.466$10$2028-60 dB
E12 filter (99.5% filtration, one level below HEPA, and basically just as good for an air purifier)
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Blueair Blue Pure 411Option for small rooms. Slightly more filtration capacity than IKEA Förnuftig but much more expensive. Filters slower than the Coway Mighty, but is more compact and slightly cheaper.10568128$120$49$69$0.54$1.00?https://www.nytimes.com/wirecutter/reviews/best-air-purifier/$3434$4.986$22$4417-46 dBHEPASilent
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Levoit Core 300Option for small rooms if you want low up-front cost. However, it is quite electricity-hungry so its 5-year cost is substantially more expensive than the Coway Mighty.14192172$100$81$96$0.56$1.0443https://www.nytimes.com/wirecutter/reviews/best-air-purifier/$47835$43.048$25$3838.7-54.1 dBTrue HEPA
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Mi Air Purifier 3HUpgrade pick. Similar stats to the Coway Mighty with more compact size, smart home features, and good look, but more expensive filter replacements.223145272$250$96$136$0.50$0.94~40https://www.airpurifierfirst.com/review/xiaomi-mi-3h/$68117$21.158$50$75True HEPA
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Levoit Core 400SAnother ugrade pick for smart home features260169317$220$95$129$0.41$0.7646https://www.nytimes.com/wirecutter/reviews/best-air-purifier/$64516$20.038$50$7524-52 dBTrue HEPA
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Blueair Blue Pure 211+Large room option. Consider using two Coway Mightys instead. One bigger Blueair is more expensive and noisier, but less maintenance hassle and more compact.350228427$300$198$244$0.57$1.0743https://www.nytimes.com/wirecutter/reviews/best-air-purifier/$1,22147$58.226$70$14031-56 dBHEPASilent
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Austin Air HealthMate HM400Pick for VOCs, but expensive and loud250163305$715$142$245$0.80$1.51~50?https://www.nytimes.com/wirecutter/reviews/best-air-purifier/$1,22582$102.0060$200$40
39.8 dB - 64.5 dB
True HEPA
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DIY option: filter over box fanVery quick and easy DIY option, if you can't get a commercial air purifier in a pinch200130244$55$153$158$0.65$1.2248https://dynomight.net/2020/12/15/some-real-data-on-a-DIY-box-fan-air-purifier/
https://twitter.com/JohnSemmelhack/status/1313855226844151808/photo/1 		$79175$93.296$30$6043-55 dB
Use MERV-13 or higher or HEPA
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DIY option: filter cube with box fan (Corsi–Rosenthal Box)Can be a solid DIY option, but effectiveness (CADR) varies a ton based on exactly how you build it, so I wouldn't be confident that it works well.600390731$85$170$175$0.24$0.4539https://dynomight.net/better-DIY-air-purifier.html
https://twitter.com/JohnSemmelhack/status/1313855226844151808/photo/1		$87440$49.766$60$12016-51 dB
Use MERV-13 or higher or HEPA
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Not my recommendations
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Coway Airmega 400Option for large rooms, but more expensive than the Blue Pure 211+350210394$650$185$289$0.73$1.38$1,44645$55.9812$129$12922-52 dBTrue HEPA
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IKEA STARKVIND15895178$180$42$75$0.42$0.80?https://dynomight.net/ikea-purifier/$37710$12.446$15$3024-53
E12 filter (99.5% filtration, one level below HEPA, and basically just as good for an air purifier)
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Based on:
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https://www.nytimes.com/wirecutter/reviews/best-air-purifier/
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https://www.tomsguide.com/best-picks/best-air-purifiers
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https://www.microcovid.org/blog/hepafilters
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Input assumptions, estimates, and data are in green cells. To edit, select File > Make a copy and change them to calculate new estimates
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Electricity price (cents/kwh)14.2
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