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PuroAir sells three purifiers that share one filter design and differ almost entirely in how much room they are rated to cover: the PuroAir 130i at 600 sq ft, the PuroAir 240 at 1,000 sq ft, and the PuroAir 400 at 2,000 sq ft. The direct answer, by room: a bedroom, nursery or home office is 130i territory at $124.99 (verified 2026-08-17), a primary suite or a medium living room is the 240 at $199.99 (verified 2026-08-14), and an open-plan main floor is the 400 at $324.99 (verified 2026-08-17). The 130i is also the only one with Wi-Fi and the quietest at 27 dB, which is why it wins the bedroom even though the 240 would technically cover it.
The one rule that matters more than the model choice is to size up. PuroAir publishes no CADR figure and no HEPA grade for the 400 or the 130i, and independent testers including HouseFresh have argued the brand's real-world clearance trails its coverage marketing. So read 600, 1,000 and 2,000 as best-case ceilings, buy the unit rated for roughly double the room you measured, and run a higher fan speed in any space that is near the limit. Every price below is from our own catalog with the date we last verified it, and every spec is what the brand publishes.
Quick answer
- Bedroom, nursery or home office under about 300 sq ft: the PuroAir 130i at $124.99 (verified 2026-08-17), rated to 600 sq ft, 27 dB on its lowest setting and the only PuroAir with an app.
- Large bedroom, studio or medium living room of 300 to 500 sq ft: the PuroAir 240 at $199.99 (verified 2026-08-14), rated to 1,000 sq ft with an auto air-quality sensor and a roughly $40 filter every 6 to 8 months.
- Open-plan kitchen and living floor of 500 to 1,000 sq ft: the PuroAir 400 at $324.99 (verified 2026-08-17), rated to 2,000 sq ft and the only unit in the line built for a whole floor rather than a room.
The three PuroAir sizes at a glance
Prices are from our verified catalog on the dates shown. Coverage is the brand's published rating, stated per hour for the 130i and 400; noise and power are the brand's figures at the lowest fan setting.
| Unit | Rated coverage | Verified price | Verified | Lowest-setting noise | Power | Connectivity |
|---|---|---|---|---|---|---|
| PuroAir 130i | 600 sq ft | $124.99 ($119.99 with filter subscription) | 2026-08-17 | 27 dB | 18W | Wi-Fi, Bluetooth, app, Alexa and Google Assistant |
| PuroAir 240 | 1,000 sq ft | $199.99 | 2026-08-14 | Not in our verified data | Not in our verified data | None (manual, indicator lights) |
| PuroAir 400 | 2,000 sq ft | $324.99 ($279.99 with filter subscription) | 2026-08-17 | 31 dB | 80W | None (manual, filter light) |
Multi-packs in the brand's feed: the 130i at $209.99 for two and $399.99 for four, the 240 at $319 for two and $499 for four, and the 400 at $505 for two and $977 for four.
How to measure the room before you pick
Multiply length by width. A 12 by 14 foot bedroom is 168 sq ft. A 16 by 20 foot primary suite is 320 sq ft. A 25 by 30 foot open kitchen and living area is 750 sq ft. Then apply the caveat that runs through every PuroAir entry in our catalog: the coverage figure is a best-case ceiling, not a guarantee. PuroAir publishes no CADR for the 400 or the 130i, and none is recorded for the 240 in our data, so there is no clean air delivery rate to compare the three on measured airflow. Our working rule for this line is to buy the unit rated for about double the room you measured, and to step up again for a high ceiling, an open stairwell or a doorway that never closes, since each adds air volume the square-foot figure ignores.
Two more sizing facts no coverage number tells you. First, a purifier cleans the room it sits in; closed doors stop it, so two bedrooms need two units, not one bigger unit in the hallway. That favors the 130i: a 2-pack is $209.99 for two rooms, $10 more than a single 240. Second, coverage is a rate, which is why PuroAir states the 130i's 600 sq ft and the 400's 2,000 sq ft per hour. A unit rated well above the room gets there on a low, quiet setting, while one sized to the limit lives on high. That is the practical case for sizing up, and the difference between a purifier you sleep next to and one you switch off.
Under 300 sq ft: the PuroAir 130i
The 130i is the entry point to the line and the only model with connectivity: Wi-Fi and Bluetooth, an app that controls fan speed and scheduling and sends a filter reminder to your phone, and voice control through Alexa or Google Assistant. It runs the same three-stage stack as its larger siblings, a pre-screen for hair and large debris, a HEPA layer, and activated carbon for odors and VOCs, and PuroAir states it filters PM1, PM2.5 and PM10 down to 0.1 micron.
The specification that decides the bedroom is noise. PuroAir publishes 27 dB at its lowest fan speed, four decibels under the 400, and positions that as white noise for sleeping, which is the brand's statement rather than ours; sleep is one of its four fan modes alongside low, medium and high. At 4.39 lbs and roughly 8 by 8 by 13 inches it moves between rooms without thought, and at 18W it is the cheapest of the three to leave running around the clock: roughly 13 kWh a month on our arithmetic, a few dollars at typical US electricity rates. PuroAir lists ISO certification and CARB compliance for it, and a two-year warranty that extends to lifetime while a filter subscription stays active.
Pricing: $124.99 standalone against a $129.99 compare-at price, or $119.99 with an active filter subscription, verified 2026-08-17. The 2-pack at $209.99 works out to about $105 a unit, and the 4-pack at $399.99 to just under $100 a unit, which is the cheapest route to covering every bedroom in a house.
Where the 130i gives ground
Coverage, plainly. Six hundred square feet is a bedroom, a nursery or a home office, and pushing it into an open living area is the mistake to avoid. Apply the double rule and its honest ceiling is a room of about 300 sq ft. It also carries the brand-level caveat: no published CADR, no stated HEPA grade, and independent testing that questions whether real-world clearance matches the marketing. And if you have no interest in putting a purifier on your Wi-Fi, the connectivity is a feature you will never open.
300 to 500 sq ft: the PuroAir 240
The 240 is the volume seller, an Amazon best-seller and a Newsweek Readers Choice winner, and its case is simple: a 1,000 sq ft rating, an auto air-quality sensor that steps the fan up on its own, quiet operation on low and auto, and a $199.99 price, verified 2026-08-14, that our catalog notes is frequently discounted to roughly $159. Our catalog entry for the 240 records a HEPA-14 filter with an activated-carbon layer for odors and VOCs; for the 400 and the 130i, PuroAir publishes no HEPA grade, and we do not carry the 240's figure across to them.
This is the size for the room that is too big for the 130i and not a whole floor: a primary suite, a studio apartment, a medium living room, a large home office. Measured at 300 to 500 sq ft, the 240's rating gives you the double margin, so it can sit on low most of the day and let the sensor do the work. The ongoing cost is a replacement filter of roughly $40 every 6 to 8 months depending on use, the number to budget for, because filters are where purifier ownership quietly gets expensive.
Where the 240 gives ground
Its spec sheet is the thinnest of the three in our data: no decibel figure, no wattage, no weight and no dimensions, so it sits blank in the noise and power columns; our catalog records only that it is quiet on low and auto. It has no app, no voice control and no scheduling; you get a front-panel button and indicator lights. Our data records a one-year warranty, against two years on the 130i and 400. And the 1,000 sq ft figure has drawn the most independent scrutiny of any PuroAir claim: outlets including HouseFresh have argued its real-world particulate clearance trails Coway Airmega, Blueair and IQAir once room size and run time are accounted for. Size it for 500 sq ft, not 1,000.
500 to 1,000 sq ft: the PuroAir 400
The 400 is the one to buy when the room is genuinely big. PuroAir rates it to 2,000 sq ft per hour, double the 240, on the same three-stage pre-screen, HEPA and activated-carbon stack, filtering PM1, PM2.5 and PM10 down to 0.1 micron by the brand's figures. An air-quality sensor drives an auto mode, and a light tells you when the filter is due. It is the only unit in the line built for an open-plan floor, and with the double rule applied it fits a measured 500 to 1,000 sq ft: a combined kitchen, dining and living area, a finished basement, or a main floor with no doors between rooms.
The living-with-it numbers: 31 dB at the lowest fan speed, 80W, and 14.7 lbs in a 14.4 by 8.1 by 21.5 inch tower. Warranty is two years, extended to lifetime while a filter subscription is active. Pricing has two routes to the same machine: $324.99 standalone against a $349.99 compare-at price, or $279.99 bundled with an active filter subscription, verified 2026-08-17. Multi-packs run $505 for two and $977 for four.
Where the 400 gives ground
It is the loudest and hungriest of the three: 31 dB against 27 for the 130i, and 80W against 18W, more than four times the electricity to run continuously. It is also a 21.5 inch, 14.7 lb tower that takes floor space the 8 by 8 inch 130i does not. Skip it if the room is under 600 sq ft, where the 130i costs less than half and runs quieter. And the brand caveat applies with the most force here, because the 2,000 sq ft claim is the biggest in the line and there is no published CADR to check it against. If a verified clean air delivery rate is a requirement for an open floor, our catalog's own note is that Coway Airmega, Blueair and IQAir all publish one; our Best Air Purifiers 2026 guide covers the alternatives we do carry.
The subscription lever, and what it is worth by size
On the 130i and the 400, an active filter subscription does two things at once: it lowers the purchase price, $124.99 to $119.99 on the 130i and $324.99 to $279.99 on the 400, and it converts the two-year warranty to lifetime for as long as it stays active. The $45 off the 400 is meaningful; the $5 off the 130i is not, so decide that one on whether you want the filter cadence handled for you. Replacement filter prices for the 130i and 400 are not in our verified data, so we cannot say what the subscription costs per year; the 240's roughly $40 every 6 to 8 months is the only filter number we hold, and we hold no subscription price for the 240.
Cost per rated square foot
Our arithmetic on standalone prices: the 130i is about 21 cents per rated square foot ($124.99 over 600), the 240 about 20 cents ($199.99 over 1,000), and the 400 about 16 cents ($324.99 over 2,000), falling to 14 cents at the $279.99 subscription price. The bigger unit is the cheaper coverage, as usual, and it holds only if the space is one room. Two bedrooms are not 400 territory at any price, because the 400 cannot clean through a wall.
Verdicts by buyer type
The light sleeper with a bedroom: the 130i. It is 27 dB at its lowest fan speed, the quietest number PuroAir publishes, and while the 240 would technically cover the room, there is no decibel figure for it in our data. Put the app on your phone, schedule it, and let it run.
The parent covering two or three kids' rooms: the 130i multi-pack. $209.99 for two or $399.99 for four beats one larger unit in the hallway, because closed doors stop a purifier cold. Wi-Fi scheduling means every unit follows the same bedtime.
The renter in a studio or one-bedroom: the 240 at $199.99, or lower on sale. One unit with an auto sensor covers a 400 sq ft studio with margin to spare, and it plugs in with nothing to install. It sits alongside the rest of the no-install kit in our renter longevity setup.
The household with an open main floor: the 400. Nothing else in the line is built for it, and at $279.99 with the subscription it is the cheapest coverage per square foot PuroAir sells. Run it above the lowest setting during the day and accept the 80W.
The buyer who needs a published CADR: none of these. PuroAir does not publish one for the 400 or 130i, and the independent skepticism is brand-level. The Best Air Purifiers 2026 guide lists the units we carry with more published data, and our home air and water setup explains where a purifier fits next to a dehumidifier.
Bottom line
Measure the room, double it, and buy the PuroAir whose rating clears that number: the 130i at $124.99 for anything under about 300 sq ft, the 240 at $199.99 for 300 to 500, and the 400 at $324.99, or $279.99 with a subscription, for 500 to 1,000. The 130i wins any bedroom outright on its 27 dB and its app, the 400 is the only honest answer for an open floor, and the 240 is the value pick for everything in between. Do not let the 2,000 sq ft headline talk you into one unit for a whole house of closed doors, because two smaller units in two rooms will do more. And if a measured clean air delivery rate is non-negotiable, the PuroAir brand hub shows exactly what the brand publishes and what it does not, and our pillar guide covers the units that publish more.
Which PuroAir do I need for a bedroom?
The PuroAir 130i. PuroAir rates it to 600 sq ft, which clears a typical 12 by 14 foot bedroom of 168 sq ft several times over, and it publishes 27 dB on its lowest setting, the quietest figure in the line. It is $124.99 standalone, verified 2026-08-17, or $119.99 with an active filter subscription, and it is the only PuroAir with an app.
Is the PuroAir 240 big enough for an open living room?
Only a modest one. PuroAir rates the 240 to 1,000 sq ft, but that is a best-case figure and independent reviewers have questioned real-world clearance at that size, so we size it for a measured 300 to 500 sq ft. For a combined kitchen and living floor above 500 sq ft, the 400 at $324.99, verified 2026-08-17, is rated to 2,000 sq ft and is the honest choice.
How much does the PuroAir 400 cost, and why are there two prices?
Standalone the 400 is $324.99 against a $349.99 compare-at price, verified 2026-08-17. Bundling it with an active filter subscription drops it to $279.99 and extends the warranty from two years to lifetime for as long as the subscription runs. Multi-packs run $505 for two and $977 for four. Replacement filter pricing for the 400 is not in our verified data.
Does PuroAir publish a CADR rating for its purifiers?
Not for the 400 or the 130i, and none is recorded for the 240 in our data. PuroAir lists room coverage (600, 1,000 and 2,000 sq ft, stated per hour for the 130i and 400), particulate filtration down to 0.1 micron and the three-stage filter stack, but no clean air delivery rate. So buy the unit rated for roughly double your measured room and run a higher fan speed in a large space.
Should I buy one PuroAir 400 or two 130i units for two bedrooms?
Two 130i units. A purifier cleans the room it sits in, and closed bedroom doors stop it, so one 2,000 sq ft unit in a hallway does not cover two rooms. The 130i 2-pack is $209.99, verified 2026-08-17, about $105 a unit, against $324.99 for a single 400, and each 130i runs at 27 dB and 18W with its own app schedule.
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