Buy the PuroAir 240 for a bedroom, nursery or home office where quiet running and a set-and-forget auto mode matter most: its particle sensor adjusts the fan for you, and testers found it quiet, especially on its lower speeds, though those speeds clean more slowly. It is compact enough for a nightstand, and its sleep mode turns the other lights off. The trade-off is reach and running cost: it is sized for a room of about 284 sq ft, not the 1,000 sq ft on the box, and it needs a new filter every 90 days. If cleaning speed for the money matters most, the Winix A230 cleared the same test room faster.
Pros
- Quiet, especially on its lower fan speeds
- Auto mode sets the fan from a particle sensor
- Compact enough for a nightstand
- Sleep mode, timer and child lock
- Two-year warranty with registration; lifetime with a filter subscription
Cons
- Sized for about 284 sq ft, not the 1,000 sq ft claimed
- Filters every 90 days make it costly to run
- Slower than the Winix A231 in HouseFresh's room test
- No app or remote; pre-filter is cleaned by removing the whole filter
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Overview
The PuroAir 240 is a compact black cylinder made to sit beside a bed or a desk and look after itself. A particle sensor on the back reads the air and sets the fan speed, a light on top shifts colour as the air changes, and a sleep mode turns the fan down and the other lights off for the night. It is a simple machine: no app, no remote, one filter cartridge and a handful of buttons.
Everything filters through one cylindrical cartridge that combines a pre-filter, a HEPA layer and activated carbon, and the control panel adds a 2 to 8-hour timer and a child lock. PuroAir lists CARB certification, and it sells replacement filters on a subscription that extends the purifier’s warranty to lifetime.
Key Specifications
| Price (USD) | $159.99 |
| Filter | One 3-stage cartridge: pre-filter, HEPA filter, activated carbon |
| Maker’s room-size claim | Up to 1,000 sq ft |
| AHAM recommended room size | 284 sq ft (AHAM report cited by HouseFresh) |
| Controls | Auto mode with particle sensor; low, medium, high and sleep; 2, 4, 6 or 8-hour timer; child lock; filter reset |
| App or remote | None |
| Lowest noise (maker) | 24 dB |
| Power | 45 W, 120 V |
| Size | 8.7 x 8.7 x 14.2 in |
| Weight | 7.3 lb |
| Filter replacement (maker) | Every 90 days |
| Certifications listed by PuroAir | CARB, ISO |
| Warranty | 2 years with registration; lifetime while a PuroAir filter subscription is active |
PuroAir 240 Cleaning Power and Room Size
Both lab-style reviews land in the same place: it cleans a small room, and it runs short of air in a big one. RTINGS calls it a basic, compact purifier meant for small spaces and lists among its cons a clean air delivery rate too low for larger rooms, even at the highest fan speed. The AHAM report HouseFresh cites puts its recommended room at 284 sq ft, sized for 4.8 air changes an hour; by our arithmetic, the same airflow in the 1,000 sq ft room PuroAir advertises would change the air fewer than 1.5 times an hour.
HouseFresh also timed it. On top speed, the 240 needed 48 minutes in HouseFresh’s 728 cu ft test room to bring particle levels to zero on one sensor and 51 minutes on another. HouseFresh’s times in the same room were 40 minutes for the Winix A231, 38 for the Coway Airmega 150 and 27 for the Blueair Blue Pure 311i Max. HouseFresh gives it one star out of five, judging its cleaning poor for the price.
Our score is higher because we rate it at its AHAM size of 284 sq ft, where it does clean the air. RTINGS rates it a good option for bedrooms, adding that a larger bedroom may need a higher fan speed, and Apartment Therapy’s reviewer, using it at home, found it worked well against allergens and smoke from cooking. HouseFresh tested it while PuroAir sold it as the “HEPA 14 240”; PuroAir now describes the 240’s filter as HEPA with CarbonTech activated carbon.
Noise and Bedroom Use
This is where it earns its place. Impressively quiet operation is one of the pros on RTINGS’ list, and its reviewers judge the low fan settings unobtrusive enough for very light sleepers; the compact body fits on a nightstand. The same low settings are where cleaning drops off, a trade-off RTINGS also flags, and HouseFresh argues that the lowest speed, the only one PuroAir quotes a noise figure for, is of no value for cleaning even a tiny room. PuroAir rates that setting at 24 dB. HouseFresh measured 36.9 dBA on the lowest fan speed and 42.2 dBA on the middle one from three feet away, and 52 to 54 dBA at top speed, adding that background noise in its test location likely pushed the low-speed readings up.
Sleep mode runs the fan at a low speed and turns the other lights off, and auto mode lets the purifier react to the air without anyone getting up in the night, a point RTINGS singles out. It isn’t silent: Apartment Therapy’s reviewer noticed a slight hum when no music or TV was playing, though the review calls a little white noise a small price for the allergy relief.
Odors and Cooking Smells
The carbon stage is modest. HouseFresh found a small amount of activated carbon inside the filter, and Apartment Therapy’s reviewer found it cleared smoke from cooking but was no instant fix for food smells: after a session with a deep fryer, the oil could still be smelled, though the air wasn’t smoky. Treat it as a particle filter that takes the edge off odors rather than an odor remover.
Controls, Filters and Running Costs
One auto/mode button cycles through auto, low, medium, high and sleep, a second sets a 2, 4, 6 or 8-hour timer, and there is a child lock and a filter light you reset after a change. The filter is a single cylinder that drops into the base after you twist off the bottom cover. Because the pre-filter is part of that cartridge, HouseFresh notes you have to take the whole filter out to clean it, every few weeks depending on use.
The filter is the expensive part. PuroAir says to replace it every 90 days, so a year takes four cartridges: a genuine four-pack was $144.99 on Amazon in October 2026. On Amazon in October 2026, the Winix A230’s one-year filter was $28.49, Coway’s Airmega 150 set (a year’s HEPA filter and two six-month carbon filters) was $49.99, and Blueair’s 311i Max filter, rated to last up to nine months, was $44.99. PuroAir also offers a lifetime warranty on the purifier for as long as you keep a filter subscription with it; otherwise the warranty is two years with registration.
How Does It Stack Up Against the Competition?
For a small purifier like this one, HouseFresh’s alternatives are the Winix A230 and Levoit’s Core 300 line, though for most people it recommends a larger purifier; the Coway Airmega 150 sits in the same small-room class, and the Blueair Blue Pure 311i Max is the step up.
| Feature | PuroAir 240 | Winix A230 | Levoit Core 300 | Coway Airmega 150 | Blueair Blue Pure 311i Max |
|---|---|---|---|---|---|
| Price (USD) | $159.99 | $99.99 | $89.99 | $189.99 | $229.00 |
| Minutes to clear HouseFresh’s 728 cu ft test room (top speed) | 48 to 51 | 40 (tested as the A231, the same purifier) | Not timed by HouseFresh | 38 | 27 |
| Recommended room size (4.8 air changes an hour) | 284 sq ft | 246 sq ft | 222 sq ft | 214 sq ft | 439 sq ft |
| Maker’s largest-room claim | Up to 1,000 sq ft | 1,181 sq ft in 1 hour | 1,066 sq ft, one air change an hour | 1,035 sq ft in 60 minutes | 2,107 sq ft in 1 hour |
| Auto mode with air-quality sensor | Yes | Yes | No | Yes | Yes |
| Filter replacement (maker) | Every 90 days | One-year filter | Every 6 to 8 months | HEPA 1 year, carbon 6 months | Up to 9 months |
| TTP Review | This review ↑ | — | Read our review → | — | Read our review → |
| Amazon | View on Amazon | View on Amazon | View on Amazon | View on Amazon | View on Amazon |
Prices change frequently — always verify current pricing before purchasing.
PuroAir 240: Worth It for a Quiet, Hands-Off Bedroom Purifier
Buy it for a bedroom, a nursery or a home office where low noise and a set-and-forget auto mode matter more than raw speed. It is small, simple and, on its lower speeds, quiet enough for light sleepers, and the sensor saves you from fiddling with fan speeds.
Look elsewhere if you want the most cleaning for the money. The Winix A230 (tested as the A231) cleared HouseFresh’s test room faster and needs one filter a year rather than four, and HouseFresh also points small-room buyers to the Levoit Core 300, a purifier of the same twist-off design. For a living room or an open-plan space, the Blueair Blue Pure 311i Max is AHAM-rated for a room roughly half as big again and adds app control.
Sources
- PuroAir — PuroAir 240 HEPA Air Purifier
- PuroAir 240 — Amazon Product Listing
- PuroAir — PuroAir 240 Replacement Filter
- PuroAir — PuroAir 240 User Manual
- RTINGS — PuroAir 240 Air Purifier Review
- HouseFresh — PuroAir HEPA 14 240 review
- Apartment Therapy — I Tried 3 Air Purifiers Before Finally Finding My Holy Grail
- Winix — A230 Air Purifier
- Winix — A231 Air Purifier
- Winix — Replacement Filter O (1712-0110-00)
- Levoit — Core 300-P Air Purifier
- Levoit — Core 300 Series Original Filter
- Coway — Airmega 150 Bedroom Air Purifier
- Coway — Airmega 150 & 160 Filter Set
- Blueair — Blue Pure 311i Max
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