Researched comparisonLast updated September 2026 · How we review
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Quick Answer
The Blueair Signature SP4i is the lowest price at $337.49 and lists coverage of 705 sq ft in 12.5 minutes and as low as 23 dB. The Coway Airmega 300 is $503.68, lists 2,512 sq ft at one air change per hour and 22 to 52 dB(A), and its listing states a 5 year warranty. The Dyson Purifier Hot+Cool HP2 is $699.99 and is a purifier that also works as a heater and a fan. The Dyson Purifier Big+Quiet BP03 is $1,099.00, lists up to 264 sq ft and 43 to 55.6 dBA on Dyson’s commercial page, and is the heaviest at 26.24 lb. All four are available on Amazon.
- Blueair Signature SP4i: best for shoppers who want a large-room purifier with a 7-stage filter and the lowest price in this guide.
- Coway Airmega 300 (AP-1515H): best for people with large rooms who want a washable pre-filter and a 5 year warranty on the motor and electronic parts.
- Dyson Purifier Hot+Cool HP2 De-NOx: best for anyone who wants one device that purifies and also works as a heater and fan.
- Dyson Purifier Big+Quiet BP03: best for buyers who want a sealed HEPA H13 filter that Dyson recommends replacing only every 5 years, plus a 43 dBA quiet setting.
Prices as of September 30, 2026, 8:52 pm CT.
A premium air purifier usually adds app control, sealed filtration, and a quieter design. This comparison looks at four models from Blueair, Coway, and Dyson, all available on Amazon, from about $340 to about $1,100. They are not all the same type of product, so the differences matter.
How We Chose
We compared four air purifiers from Blueair, Coway, and Dyson that are available on Amazon. We left out other Dyson models, such as the Purifier Cool PC1 and PC2. This is a comparison of a higher price class than our earlier Best Air Purifiers for Living Rooms guide, and it is not an exact match: the Blueair and Coway are large-room purifiers, the Dyson Big+Quiet is a large-format purifier, and the Dyson HP2 is a purifier that also heats and cools as a fan, so it is a different type of product. Prices run from about $340 to about $1,100. Coverage is given in different ways on the listings (minutes to clean a room, or hourly coverage), so we list the numbers as given; Dyson prints a coverage figure only for the Big+Quiet (264 sq ft). Noise levels come from each manufacturer’s page and may be measured differently by each brand; Dyson’s figures for the BP03 come from its commercial page. Blueair prints the SP4i name as Blue Signature Large. Where a listing did not state a warranty, we checked the manufacturer’s own website. Blueair and Coway list terms by product line rather than by model name, and Dyson lists terms by product category. This is a researched comparison, not a hands-on test, so we make no claims about how well any of them cleans the air. Prices are Amazon prices checked in September 2026 and can change.
The Lineup
Prices as of September 30, 2026, 8:52 pm CT. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. Amazon may show a different seller than the brand or Amazon.com. Certain content that appears on this site comes from Amazon. This content is provided “as is” and is subject to change or removal at any time.
BLUEAIR Air Purifiers for Home Large Room up to 3,385 Ft², Signature SP4i
$337.49 as of Sep 30, 2026, 8:52 pm CT on Amazon · lowest price, quiet
Best for: shoppers who want a large-room purifier with a 7-stage filter and the lowest price in this guide.
The listing describes cleaning rooms up to 705 sq ft in 12.5 minutes and 3,385 sq ft every hour, with 7-stage HEPASilent filtration and OdorFence technology for odors, gases, and VOCs. It lists operation as low as 23 dB, Auto Mode, app control, and an air quality indicator built into the air outlet. The item weight is 13.2 lbs. The listing did not state a warranty, and Blueair’s pages list 1 year, extended to 3 years if registered within 60 days, by product family. It is available on Amazon.
Check Price on Amazon →COWAY Air Purifier for Home Up to 2,512ft², Washable Pre-Filter and HEPA Filter, Airmega 300, AP-1515H
$503.68 as of Sep 30, 2026, 8:52 pm CT on Amazon · largest stated coverage, 5 year warranty
Best for: people with large rooms who want a washable pre-filter and a 5 year warranty on the motor and electronic parts.
The listing describes coverage of up to 2,512 sq ft in 60 minutes, a filtration system with a pre-filter, active carbon filter, and HEPA filter, and Smart, Eco, and Sleep modes. It lists 22 dB, and Coway’s page for the Airmega 300 (which names the AP-1515G, not the AP-1515H) gives 22 to 52 dB(A) and a weight of 21.4 lb. The listing title states a 5 year warranty, and Coway’s warranty page lists 5 years on motor and electronic parts and 1 year on other internal parts for the Airmega 300, with filters excluded. It is available on Amazon.
Check Price on Amazon →Dyson Purifier Hot+Cool HP2 De-NOx
$699.99 as of Sep 30, 2026, 8:52 pm CT on Amazon · heater and fan in one
Best for: anyone who wants one device that purifies and also works as a heater and fan.
The listing describes sealed 3-stage HEPA H13 filtration, and it says the unit removes odors and gases and continuously destroys formaldehyde. It also works as a fan and a room heater using Air Multiplier technology, with oscillation up to 350 degrees, MyDyson app and voice control, and schedules. Dyson’s page lists 12.1 lb for the Nickel/Gold and 12.2 lb for the White/Gold. Coverage area and noise were not stated in the fields we checked. The listing did not state a warranty, and Dyson’s product pages list 2 years. It is available on Amazon.
Check Price on Amazon →Dyson Purifier Big+Quiet Formaldehyde BP03
$1,099.00 as of Sep 30, 2026, 8:52 pm CT on Amazon · 5 year filter
Best for: buyers who want a sealed HEPA H13 filter that Dyson recommends replacing only every 5 years, plus a 43 dBA quiet setting.
The listing describes a large-format purifier with HEPA H13 filtration, a filter it says is 3.8x larger than the previous generation and lasts up to 5 years, and airflow projected over 32 feet. It lists 35 dB, a Breeze mode, a Do not disturb mode, MyDyson app control, and formaldehyde detection and destruction. Dyson’s own pages list a weight of 26.24 lb and coverage of up to 264 sq ft, and its commercial page gives noise of 43 dBA on the quiet setting and 55.6 dBA at maximum. The listing did not state a warranty, and Dyson’s product page lists 2 years. It is available on Amazon.
Check Price on Amazon →Our Take
If you want a large-room purifier at the lowest price, the Blueair lists the quietest low setting and the lowest cost. If you want the largest stated coverage and a stated 5 year warranty, the Coway lists both. If you want a Dyson, the HP2 adds heating and fan use for $699.99, and the Big+Quiet costs $1,099.00 and lists a 5 year filter. Because Dyson prints a coverage area only for the Big+Quiet, we could not compare room size across all four, and we did not test any of them.
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Frequently Asked Questions
Are these air purifiers the same type of product?
No. The Blueair and Coway are large-room purifiers, the Dyson HP2 is a purifier that also heats and works as a fan, and the Dyson Big+Quiet is a large-format purifier. We note the type in the table so you can compare fairly.
Why are other Dyson models not included?
We limited the guide to two Dyson models, the HP2 and the Big+Quiet, so each brand is compared fairly against the Blueair and Coway. Dyson makes other purifiers that are not covered here.
What warranty do these air purifiers have?
Dyson lists 2 years on its product pages. Coway lists 5 years on motor and electronic parts. Blueair lists 1 year, extended to 3 years for the Blue Signature line if you register within 60 days. Filters are excluded or covered only briefly by all three manufacturers.
How is room coverage measured on these listings?
Blueair gives minutes to clean a room and hourly coverage, Coway gives square feet in 60 minutes, Dyson prints a coverage area only for the Big+Quiet (up to 264 sq ft), and the HP2 listing did not state one in the fields we checked. Because the methods differ, we list the numbers as given.
