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You probably have two tabs open. One is a slim, cylindrical Levoit that often sells for under $200 and connects to an app. The other is a wider, heavier Coway that lists at about twice the price. Both are sold for large rooms, and both pair a particle filter with activated carbon. Their headline CADR numbers sit within roughly 8% of each other, so what is the extra $180–$210 buying?
This comparison covers what actually separates the two:
- how each CADR converts into a realistic room size
- what “HEPA” means on each box
- how loud each one is at speeds you’ll actually use
- what the filters cost over three years
- whether you want an app
Two things trip up shoppers. Levoit’s current Core 400S-P carries lower AHAM-verified numbers than the 260 CFM still quoted on older pages. And the base Airmega 250 has no Wi-Fi, because that is the Airmega 250S.
Levoit Core 400S vs Coway Airmega 250: Quick Answer
There is no universal winner. Here is how the evidence breaks down:
- CADR is close, and the lead depends on the particle type. Coway lists 249 smoke / 261 dust / 230 pollen. Levoit’s Amazon listing cites 231 smoke / 240 dust / 259 pollen. Coway is ahead on smoke and dust, and Levoit is ahead on pollen. CowayAmazon
- Levoit is quieter at usable speeds. In HouseFresh testing, the Levoit had more airflow under 45 dBA than the Coway (details below).
- Levoit costs much less up front and has cheaper filters. The Levoit is $189.99 and the Coway is $399. The Coway filter is $89 against Levoit’s $49.99, but Coway’s filter is rated to last longer. LevoitCoway
- Coway has a washable pre-filter and a longer motor and electronics warranty. The base Airmega 250 has no app.
- Levoit is the smart-home pick. It has an app, voice control and a numeric PM2.5 readout.
Levoit Core 400S vs Coway Airmega 250 — Side-by-Side Comparison
| Feature | Levoit Core 400S (current 400S-P) | Coway Airmega 250 (AP-1720H) |
|---|---|---|
| Approx. price | $189.99 sale, $219.99 list (Levoit.com) | $399 (Cowaymega.com); 250S: $449 |
| CADR (AHAM) | 231 smoke / 240 dust / 259 pollen CFM. Older 400S: 260 CFM | 249 smoke / 261 dust / 230 pollen CFM |
| Recommended room size | 358 sq ft at 4.8 ACH; 1,718 sq ft at 1 ACH | 465 sq ft at 4 ACH; 930 at 2 ACH; 1,860 at 1 ACH |
| ACH context | Leads with 4.8 ACH (about AHAM’s 2/3 rule) | Leads with “930 sq ft” (2 ACH). About 389 sq ft at 4.8 ACH (our calculation) |
| Filtration | Pre-filter, main filter and activated carbon, combined in one replaceable unit | Washable pre-filter plus Max2 filter (carbon + HEPA-type) |
| HEPA status | Levoit claims HEPA-grade efficiency in Sleep Mode, tested to an IEST method by an independent lab. It doesn’t use a “True HEPA/H13” label. | Marketed as “Green True HEPA,” 99.97% at 0.3 µm claimed. We found no public independent certificate. |
| Activated carbon | Yes. 240 g standard; 400–450 g optional filters | Yes (quantity not published in sources we checked) |
| Air-quality sensor | Laser dust sensor | Real-time pollution monitor; particle and gas sensors reported on the 250S |
| PM2.5 display | Yes (numeric) | No numeric readout; four-color LED bar |
| Auto mode | Yes | Yes (Smart Mode plus Rapid Mode) |
| Sleep mode | Yes | Yes |
| Wi-Fi/app | Yes (VeSync) | Base 250: no Wi-Fi. 250S: Wi-Fi + IoCare+ app |
| Voice assistants | Alexa, Google Assistant | Base 250: none listed. 250S: voice control |
| Noise | 22–52 dB (Levoit); 35.5–60.3 dBA at 3 ft (HouseFresh) | 22–54 dB(A) (Coway); 35.7–59.3 dBA at 3 ft (HouseFresh, 250S) |
| Power | 38 W rated; under 2 W standby | 64 W rated |
| Filter life | Depends on use; reviewers plan on about 6 months to 6–8 months | Spec: 1 year; headline: 6–12 months |
| Replacement filter | $49.99 standard; $59.99–$64.99 carbon-heavy options | $89.00 |
| Dimensions | 10.8 × 10.8 × 20.5 in | 18.5 W × 19.7 H × 8.3 D in |
| Weight | 11 lb | 20.5 lb |
| Warranty | 2-year limited | 1 year internal/functional parts; 3 years motor and electronics |
Price and Availability in 2026
We checked both manufacturers’ sites on September 20, 2026. Levoit’s site showed the Core 400S-P at $189.99, marked down from $219.99. Coway’s site listed the Airmega 250 at $399 and the Wi-Fi Airmega 250S at $449. That is a $180–$210 gap, depending on whether Levoit’s sale is running. Levoit Core® 400S-P Smart Air Purifier for Large Rooms +2
Retailer prices move often, and Amazon or other stores may be lower than these list prices. We haven’t verified a current Amazon price for either, so check the live listing before buying. Levoit’s own product page is the best place to confirm current Core 400S-P specs.
Filtration Comparison
Both use the same three-part idea: a pre-filter for hair and lint, a fine-particle filter, and activated carbon for odors.
Levoit bonds these layers into one cylindrical filter. HouseFresh notes that cleaning the pre-filter means pulling the whole filter, and the entire unit gets replaced when the carbon is used up. Levoit sells several versions: 240 g of carbon in the original, 400 g in the Pet Allergy and Toxin Absorber, and 450 g in the Smoke Remover. More carbon can help with odors, but it also restricts airflow and can lower particle removal. Levoit Core 400S review – HouseFresh +2
Coway uses a washable pre-filter that you slide out, rinse and hang to dry. Behind it sits the Max2 filter, which is a single all-in-one HEPA-type and carbon unit. There is one filter option, so you can’t trade airflow for extra carbon. CowayCoway
HEPA Filtration: What Do the Specifications Actually Mean?
“True HEPA” in US marketing usually refers to capturing 99.97% of 0.3-micron particles. “H13” is a European classification for a similar level of efficiency. Neither term means much unless it’s backed by a test report for the whole filter, so keep three things separate: manufacturer claims, third-party test methods, and certifications.
- Levoit: Its filter page states a 99.97% claim for particles down to 0.3 µm. It separately says the filter reaches HEPA-grade efficiency in Sleep Mode, tested to an IEST method by an independent lab. Levoit’s parent company, VeSync, previously discontinued certain HEPA claims after a 2023 challenge by Dyson at BBB National Programs’ advertising review division. That challenge covered other models, and the reviewers didn’t rule on the merits. HouseFresh reports that Levoit dropped “HEPA H13” wording from the Core 400S’s marketing in late 2023. Another reviewer notes the 400S-P is not certified HEPA-grade. Levoit Core® 400S-P Air Purifier 3-Stage Replacement Filter +4
- Coway: It markets “Green True HEPA” with a 99.97% claim at 0.3 microns. Its broader 0.01-micron claims are attributed on Coway’s Canadian site to Korea Conformity Laboratories testing under a Korean industry standard. We couldn’t find a public independent HEPA certificate for the Airmega 250’s Max2 filter specifically. HouseFresh describes the 250S filter as a bonded H13 HEPA filter, but that is a reviewer’s characterization, not a certificate. Coway Airmega 250 Max2 Filter Replacement for Air Purifier – Cowaymega +2
So neither brand’s “HEPA” language is independently proven from the public documents we reviewed. HouseFresh argues you don’t need a HEPA label to get excellent air-cleaning performance. For most buyers, AHAM-verified CADR and independent clearing tests are better evidence. HouseFresh
CADR and Room Size Comparison
CADR (Clean Air Delivery Rate) is how much filtered air a purifier delivers per minute, in cubic feet per minute (CFM). AHAM’s program reports separate numbers for smoke, dust and pollen. ACH (air changes per hour) is how many times per hour the purifier can cycle a room’s full volume. The conversion for an 8-foot ceiling is: AHAM Verifide
Room area (sq ft) = CADR × 7.5 ÷ ACH
AHAM’s consumer rule is that smoke CADR should equal at least two-thirds of the room’s floor area. That is roughly 4.8 ACH. Using it, the Levoit suits rooms up to about 346 sq ft and the Coway about 373 sq ft. AHAM Verifide
Here is our calculation from each manufacturer’s smoke CADR:
| ACH | Levoit (231 CFM) | Coway (249 CFM) |
|---|---|---|
| 1 | ~1,733 sq ft | ~1,868 sq ft |
| 2 | ~866 | ~934 |
| 3 | ~578 | ~623 |
| 4 | ~433 | ~467 |
| 4.8 | ~361 | ~389 |
| 6 | ~289 | ~311 |
Why published room sizes differ:
- The ACH benchmark. Levoit leads with 1,718 sq ft (1 ACH) and gives 358 sq ft at 4.8 ACH. Coway leads with “930 sq ft,” which is 2 ACH.
- The CADR version. Older pages cite the original Levoit’s 260 CFM and 403 sq ft. The current -P version’s specs are 231 CFM and 358 sq ft. Clean Air AdviserClean Air Adviser
- Small rounding differences. Levoit’s own page shows both 1,718 and 1,733 sq ft.
- Other benchmarks. HouseFresh uses 5 ACH and gets 373 sq ft for a 249 CFM measured rate. HouseFresh
Independent test evidence: In HouseFresh’s 728 cubic-foot test room at top speed, the US Levoit Core 400S cleared PM1 particles in 24 minutes. The Coway Airmega 250S also took 24 minutes. HouseFresh tested the Levoit before the -P revision, and its Levoit page gives different PM1 CADR estimates in different places, so we treat this as directional. We used the 250S because Coway lists the same CADR, noise and power for both versions. HouseFreshHouseFresh
Realistic room guidance:
- Up to ~200 sq ft: Either works at high air-change rates on quiet settings.
- 200–350 sq ft: Both are appropriate at roughly AHAM’s 2/3 rule. The Coway has slightly more headroom.
- 350–470 sq ft: Expect about 4 ACH on the Coway and 3–4 ACH on the Levoit at top speed.
- Above ~500 sq ft: Both drop to 2–3 ACH. That is fine for background filtration but not fast cleaning, so consider a larger model.
Noise Comparison
Manufacturers’ quoted ranges are similar: Levoit lists 22–52 dB and Coway lists 22–54 dB(A). Levoit’s own pages also show two different lows: 22 dB in the specs, and 24 dB in the feature blurb. HouseFresh’s measurements at 3 feet, with 35 dBA of background noise, tell a more useful story: LevoitCoway
| Setting | Levoit US (HouseFresh) | Coway 250S (HouseFresh) |
|---|---|---|
| Sleep | 35.5 dBA | 35.7 dBA |
| Speed 1 | 38.3 | 36.5 |
| Speed 2 | 43.2 | 50.2 |
| Speed 3 | 51.2 | 59.3 |
| Speed 4 | 60.3 | — |
Sources: Levoit, Coway. HouseFreshHouseFresh
The more important finding is airflow under 45 dBA. HouseFresh estimated 134 CFM for the Levoit and 91 CFM for the Coway. The Coway has only three speeds, with a big noise jump between speeds 1 and 2. The Levoit has more steps in the range most people tolerate all day. HouseFreshHouseFresh
Air Quality Sensors and PM2.5 Monitoring
Levoit uses a laser dust sensor with a numeric PM2.5 display. Its accuracy could be better, per AirPurifierFirst, so treat the number as a trend indicator. Coway has no screen. A color bar runs from blue (good) to red (very unhealthy). Both auto modes ramp the fan with the sensor. Coway also offers Rapid Mode, which holds maximum power until the air improves. Neither sensor is a calibrated instrument. Levoit Core® 400S-P Smart Air Purifier for Large Rooms +3
Smart Features and App Control
The Levoit works with the VeSync app, Alexa and Google Assistant. The app supports schedules, timers, filter-life checks and air-quality updates. HouseFresh likes that it lets you adjust auto-mode behavior, though it dislikes the in-app ads. Levoit Core® 400S-P Smart Air Purifier for Large Rooms +2
The base Airmega 250 has no Wi-Fi. TechHive states that the 250 lacks Wi-Fi and costs $50 less than the 250S. The 250S adds Wi-Fi, the IoCare+ app, scheduling and voice control. HouseFresh reported that the IoCare+ app kept logging users out and had a 1.4/5 App Store rating (December 2025). Coway Airmega 250S review: Smart and quiet air purification | TechHive +2
Smoke, Dust, Pollen and Pet Dander
A purifier like these may help reduce airborne particles, including fine dust, pollen, pet dander and smoke. They are not medical devices. Pet hair and dust that have settled on surfaces still need vacuuming, and neither purifier replaces source control or ventilation. See the use-case sections below.
Odor and VOC Filtration
Activated carbon adsorbs some odor molecules and gases. It has limited capacity, and it is not a replacement for ventilation or removing the source. The Levoit gives you more control, because you can choose Pet Allergy ($59.99), Toxin Absorber ($59.99) or Smoke Remover ($64.99) carbon filters. The Coway has a single Max2 filter. Neither company publishes independent VOC-removal test data in the sources we reviewed. Levoit
Energy Consumption
Rated power is 38 W for the Levoit and 64 W for the Coway. HouseFresh measured them at top speed: LevoitCoway
| Setting | Levoit | Coway 250S |
|---|---|---|
| Standby | 0.93 W | 1.76 W |
| Sleep | 3.05 W | 4.53 W |
| Top speed | 39.64 W | 57.71 W |
Sources: Levoit, Coway. HouseFreshHouseFresh
Running at top speed all year would cost HouseFresh’s estimate of $44.43 for the Levoit and $64.10 for the Coway. Real use is lower, so the gap in practice is smaller. HouseFreshHouseFresh
Filter Replacement Cost and Maintenance
Levoit: The standard filter is $49.99. The filter page says you may need to replace it earlier or later depending on use and pollution. HouseFresh budgets every 6 months, and FilterScored cites 6–8 months. Levoit Core® 400S-P Smart Air Purifier for Large Rooms +3
Coway: The Max2 is $89. The spec lists 1 year, though the headline says 6–12 months. HouseFresh planned on 6–12 months. Coway’s site advertises subscription discounts, so check current terms. Coway Airmega 250 Max2 Filter Replacement for Air Purifier – Cowaymega +4
Three-year cost (our calculation, list prices, filters only, counting replacements within 36 months):
| Scenario | Levoit | Coway 250 |
|---|---|---|
| Levoit every 6 mo, Coway every 12 mo | $439.94 (5 filters) | $577.00 (2 filters) |
| Levoit every 8 mo, Coway every 12 mo | $389.95 (4 filters) | $577.00 |
| Both every 6 mo (heavy use) | $439.94 | $844.00 (5 filters) |
Levoit costs less to own in every scenario, and the gap is smallest if the Coway filter really lasts a year.
Third-party filters: HouseFresh notes Levoit-compatible generics from $34.99. Coway’s warranty excludes problems caused by non-genuine filters. Levoit warns that non-genuine filters can throw off its filter indicator and risk the motor. Levoit Core 400S review – HouseFresh +2
Cleaning: The Levoit’s laser sensor needs an occasional vacuum, per Levoit via HouseFresh. The Coway’s pre-filter needs periodic rinsing, and an indicator tells you when. HouseFresh
Design, Size and Portability
The Levoit is a 10.8-inch cylinder that weighs 11 lb and takes up little floor space. The Coway is a wide, flat tower at 20.5 lb. HouseFresh notes it’s wider than other mid-sized units but has hand holds. TechHive says it can sit against a wall, since air enters at the front and exits the top. Levoit Core® 400S-P Smart Air Purifier for Large Rooms +3
Warranty
Levoit’s site lists a 2-year limited warranty. Coway’s US policy for the Airmega 250 is 1 year on internal/functional parts, 3 years on motor and electronics. It also requires proof of purchase from an authorized seller, and genuine filters. Levoit’s overall term is shorter than Coway’s motor and electronics term, but Coway’s first-year coverage is narrower. Levoit Core® 400S-P Smart Air Purifier for Large Rooms +2
Which Is Better for a Bedroom?
Both have sleep modes. HouseFresh measured them at about 35.5–35.7 dBA, and the true room level is lower given the lab’s 35 dBA background. Levoit lists 26 dB or less in Sleep Mode. levoit
The gap opens when you want more than sleep-mode airflow. Using HouseFresh’s method, the Levoit’s 134 CFM under 45 dBA supports about 5 ACH in ~200 sq ft. The Coway’s 91 CFM supports about 137 sq ft, and its next speed is ~50 dBA. For most bedrooms, especially those over ~150 sq ft, the Levoit is the quieter choice. In very small bedrooms the Coway on speed 1 is also fine.
Which Is Better for Allergies and Pollen?
Pollen grains are large, and both purifiers’ particle filters are designed to catch them. AHAM suggests choosing units with higher pollen ratings if pollen is your issue. Levoit’s listed pollen CADR (259) is higher than Coway’s (230). For airflow, consider room size, filter freshness and placement. AHAM Verifide
A purifier may help reduce airborne particles, but it doesn’t treat allergies. If symptoms are significant, talk to a clinician.
Which Is Better for Pet Owners?
Focus on airborne dander, not hair. Both have pre-filters for fur. Coway’s washable pre-filter is easier to rinse. Levoit’s is built into the main filter, but Levoit offers a Pet Allergy carbon filter for odors. Buyers with heavy shedders will likely prefer Coway’s easy pre-filter maintenance. Buyers focused on pet odor may prefer Levoit’s higher-carbon option. Levoit
Which Is Better for Smoke?
AHAM’s rule of thumb for wildfire smoke is a smoke CADR equal to the room’s square footage. That works out to about 231 sq ft for the Levoit and about 249 sq ft for the Coway (our calculation). Coway has a slight edge on smoke CADR, while Levoit offers a 450 g carbon Smoke Remover option, with the airflow tradeoff noted earlier. At the higher speeds needed for smoke, both are loud: 60.3 dBA for the Levoit and 59.3 dBA for the Coway in HouseFresh’s tests. Gases and VOCs from smoke are harder to filter than particles. AHAM Verifide
Which Is Better for Smart-Home Users?
The Levoit, clearly. It has an app, schedules, voice control and a numeric PM2.5 readout, all for less money. If you want a Coway with those features, you need the 250S at $449, and you should weigh the app complaints noted above.
Who Should Choose the Levoit Core 400S?
- Shoppers who want app control and voice assistants on a budget
- Bedroom users who want low noise at moderate speeds
- Small-footprint homes or apartments
- Buyers who want filter options (pet, toxin, smoke)
- Buyers who want the lowest three-year cost
Who should skip it: anyone who wants a stand-alone washable pre-filter, a documented HEPA certificate, or a bigger margin for rooms above ~350 sq ft.
Who Should Choose the Coway Airmega 250?
- Buyers who want slightly higher smoke and dust CADR
- Owners who prefer a rinse-and-reuse pre-filter
- Buyers who value a longer filter interval and a 3-year motor and electronics warranty
- Anyone who wants no app or Wi-Fi at all
Who should skip it: smart-home users (unless they buy the 250S), quiet-mid-speed seekers, or buyers watching budget or floor space. We cover it in more detail in our Coway Airmega 250 review.
Pros and Cons
Levoit Core 400S
Pros
- Lower price
- App, voice control and numeric PM2.5 display
- More usable quiet speeds
- Lower power draw
- Cheaper filters
- Compact footprint
Cons
- Current AHAM CADR is lower than older listings imply
- Filters are replaced more often
- Bonded pre-filter is less convenient to clean
- App has ads
- No published HEPA certificate
Coway Airmega 250
Pros
- Slightly higher smoke and dust CADR
- Washable pre-filter
- Longer rated filter life
- 3-year motor and electronics coverage
Cons
- Roughly twice the price
- No Wi-Fi or app on the base model
- Only three speeds, with a big noise jump
- Higher power draw
- Heavier and wider
- Pricier filter
Levoit Core 400S vs Coway Airmega 250: Alternatives to Consider
- Coway Airmega 250S if you want Coway with an app.
- Levoit Vital 200S: HouseFresh says most people would be better off with it because of its removable pre-filter. HouseFresh
- Coway Airmega 200M: HouseFresh says it removes particles better for less money than the 250S. HouseFresh
- Levoit Core 600S for bigger rooms.
- Winix 5500-2: HouseFresh says it offers the same air-cleaning power at lower upfront and long-term cost than the 250S. HouseFresh
Frequently Asked Questions
Is the Levoit Core 400S better than the Coway Airmega 250?
It depends. The Levoit wins on price, features, quiet speeds and filter cost. The Coway is slightly stronger on smoke and dust CADR and has a washable pre-filter.
Which has better CADR?
The Coway leads on smoke (249 vs 231) and dust (261 vs 240). Levoit’s listing leads on pollen (259 vs 230).
Which is quieter?
At sleep mode they’re nearly identical. At mid speeds the Levoit is quieter in HouseFresh’s tests.
Which is better for allergies?
Both are designed to capture pollen and dust. The Levoit’s higher pollen CADR is a small edge on paper, and either may help reduce airborne particles.
Which is better for pets?
The Coway’s washable pre-filter suits shedding pets. The Levoit’s pet-specific carbon filter suits odors.
Does the Coway Airmega 250 have Wi-Fi?
No. Wi-Fi and the app come with the Airmega 250S. Coway
Is the Airmega 250 the same as the 250S?
They share the same CADR, noise and power specs on Coway’s pages. The 250S adds Wi-Fi, an app and voice for $50 more. Coway also sells an Airmega 250 Art with a printed cover, which isn’t compared here.
How often should the filters be replaced?
Coway lists about a year for its Max2. Levoit’s interval depends on usage, and reviewers plan on 6–8 months. Both have filter-life indicators.
What room size is appropriate for each?
By AHAM’s 2/3 rule, roughly 346 sq ft for the Levoit and 373 sq ft for the Coway, and larger at lower air-change rates (see the table above).
Which is better for smoke?
For wildfire smoke, AHAM’s guideline points to about 231 sq ft (Levoit) and 249 sq ft (Coway). Coway has the small CADR edge, and Levoit offers a higher-carbon filter.
Final Verdict: Which One Fits Your Home?
- Choose the Levoit Core 400S if you want the lowest price, an app and quiet mid-speed operation.
- Consider the Coway Airmega 250 if you want a washable pre-filter, a longer rated filter life and a slight CADR edge.
- For smart-home control, the Levoit (or the Coway 250S at a higher price).
- For a bedroom, the Levoit, especially above ~150 sq ft.
- For larger rooms, the Coway has slightly more headroom, but neither is ideal above ~500 sq ft.
- For pet dander, the Coway for easy pre-filter cleaning, the Levoit for odor-focused filter options.
- For smoke, the two are close, and both are loud at top speed.
- For maintenance cost, the Levoit costs less over three years in all our scenarios.
Building out a broader home routine? Our roundup of trending wellness products for 2026 covers other home-wellness gear worth a look.
Notes for you (not part of the article):
- I couldn’t open lifecarebalance.com (the site blocks automated access), so I couldn’t search it for other relevant articles. The trending-wellness link is the one you supplied, and the Airmega 250 review link uses the slug from your plan. Please confirm it is live.
- The article has exactly five external links: Levoit’s official page, an AHAM Verifide page, HouseFresh’s Airmega 250S review, the BBB National Programs decision summary, and Coway’s official page. I didn’t add the Coway link as a standalone anchor. If you want the anchor “Coway’s product page,” swap it in for one of the existing mentions. Amazon affiliate buttons would add more external links, so add them per your site’s policy.
- RTINGS’ full review is behind a paywall, so no RTINGS data is used. HouseFresh supplied the independent test numbers, and its Levoit data predates the -P revision.