Winix vs Coway
The unusual thing about this pair is that the same question decides both: which half of the range are you actually buying?
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Neither brand answers the question by itself, because both sell two kinds of machine. Winix splits between PlasmaWave models with an ion stage and plain fan-and-filter ones like the AT41 and C710. Coway splits between the certified Airmegas — all measuring 0.00 ppb — and the AP-1512HH, which is in no register and ships an unmeasured ionizing stage. Buy the AT41 or an Airmega and you are buying well from either brand.
Most brand comparisons resolve into a winner. This one resolves into a warning, because the variation inside each range is larger than the difference between them — and in both cases the model people buy most is not the model that files the best numbers.
The two ranges, side by side
| Model | Smoke CADR | Certified room | Ion stage | Measured ozone | Register |
|---|---|---|---|---|---|
| Winix C710 | 248 CFM | 384 sq ft | None | 1 ppb | AHAM |
| Winix AT41 | 265 CFM | 410 sq ft | None | 0 ppb | AHAM |
| Winix T810 | 270 CFM | 419 sq ft | PlasmaWave | 1.35 ppb | AHAM |
| Winix 5500-2 | 239 CFM | 370 sq ft | PlasmaWave | Not published | AHAM (discontinued) |
| Coway Airmega Mighty AP-1512HH | 233 claimed | 361 sq ft claimed | Bipolar | Not measured | Neither |
| Coway Airmega 400 | 376 CFM | 583 sq ft | None | 0.00 ppb | ENERGY STAR |
| Coway Airmega 450 | 443 CFM | 687 sq ft | None | 0.00 ppb | ENERGY STAR |
| Coway Airmega ProX | 577 CFM | 894 sq ft | None | 0.00 ppb | ENERGY STAR |
Electricity costs on this page use 18.34¢ per kWh, the U.S. average residential price for June 2026 from the U.S. Energy Information Administration, Electric Power Monthly, Table 5.3. Your rate is on your bill and is probably not this one; multiply the kWh figure by your own rate and you have your number.
Each brand splits, and the split is the decision
Winix splits by technology. PlasmaWave is a bipolar ion stage, and ENERGY STAR records 1.35 ppb on the T810 against 0.00 for the AT41. The AT41 and C710 are classified “Fan with Filter” by AHAM — no ion generator at all. Same brand, same shelf, different answer to the one question this site weights hardest.
Coway splits by evidence. The Airmegas are certified, measured and documented. The AP-1512HH — by a wide margin the most recommended machine in this whole category — is in no register, publishes no certified energy figure, and carries a bipolar stage with no independent ozone measurement anywhere.
So the honest version of “Winix vs Coway” is: pick the right half of either range and you have bought well. Pick the popular model from either brand and you may not have — why an unmeasured ion stage is the thing we weight hardest.
Where Winix wins
Certified air for the money, in the middle of the range. The AT41’s 265 CFM across 410 certified square feet is the most certified air of any mid-price machine on this site, and it does it without an ion stage.
Running cost at mid size. The C710 posts 6.2 CFM per watt — $43 a year — against the Airmega 400’s 6.1 and $67. For a single room, Winix is the cheaper habit.
AHAM listing. Winix files with AHAM, which Coway does not appear in at all. Neither register is the soft one, but a machine in AHAM can be checked against the same directory this site quotes for most of the category.
Where Coway wins
Washable pre-filters on every Airmega. Coway documents one on the 400, 450 and ProX. Among the Winix machines here only the discontinued 5500-2 documents one, which means the brand’s current line-up offers nothing on the specification that matters most in a shedding household — the short list of machines that document one.
Size. Winix tops out at 419 certified square feet. Coway reaches 894. For an open-plan floor this is not a close call.
Published numbers, and one complete filter bill. Coway publishes a noise range for every Airmega and, on the Airmega 400, both a filter price and an interval — the only fully computable running cost on this site. Winix publishes no noise figure and no filter price we could source for any model.
You can actually buy it. Every Airmega resolves to a live listing naming the model. None of the Winix units here did at our last check, so their buy buttons are tagged searches. That is not a performance judgment, but it is a real difference at the moment of purchase.
One brand you can buy, one you have to hunt for
This is not a performance judgment, but it decides real purchases. Every Coway Airmega we cover resolves to a live Amazon listing that names the model, so the buy button on this site points at the exact machine the certified figures describe. At our last check none of the Winix units here did: the catalog offers the AT40 where we want the AT41 — a different certification entry, which we will not substitute — and we found no listing for the C710 at all.
The 5500-2 makes the point sharper. Winix confirmed it and the 5300-2 are discontinued in the U.S. and Canada with the 5510 named as successor, and certification does not transfer between model numbers. So a buyer following an older Winix recommendation can easily end up with a machine whose figures nobody has published. With Coway the risk runs the other way: the model that is easiest to buy, the AP-1512HH, is the one in no register.
The filter field, where Winix quietly wins
The registers record a filter classification per model, and this is the one comparison where Winix comes out ahead. The T810 is recorded HEPA and the 5500-2 “HEPA + Carbon”; the AT41 and C710 are HEPA-Type. Coway has no machine recorded HEPA anywhere in its range: the 450 and ProX are HEPA-Type, and the Airmega 400 is recorded as a “Composite Filter”, not classified either way.
As always, the classification is an input measure and certified CADR is the outcome — a HEPA-Type machine moving more air delivers more clean air. But if you are choosing between two machines of similar output and the filter grade is what is bothering you, Winix is the brand with entries in that column — what the classifications actually mean.
What each costs to run
At mid size Winix is cheaper to own on the half anyone can compute. The C710 certifies 384 square feet on 235 kWh a year and the AT41 410 on 272. The Airmega 400 wants 366 kWh for 583 square feet — more room, more electricity, and a filter bill on top.
The filter half inverts it. Coway publishes a price and an interval for the Airmega 400, so its total is knowable at $196 a year. Winix publishes neither for any model here, so its running cost stops at electricity and the rest is a blank you discover later — what each manufacturer publishes about filters.
Quick picks
The best-evidenced machine from each brand, plus the Coway to buy if the room is large.
| # | Product | Best for | Certified CADR | Price |
|---|---|---|---|---|
| 1 |  Best Winix on the evidence Winix AT41 265 certified CFM across 410 sq ft, no ion generator, 0.00 ppb measured. | Pet allergies, whole living room | 265CFM smoke AHAM VERIFIDE | |
| 2 |  Best Coway for a pet household Coway Airmega 400 376 certified CFM, washable pre-filters on both faces, 0.00 ppb. | Large rooms, verified Coway | 376CFM smoke ENERGY STAR verified | |
| 3 |  Cheapest to run at mid size Winix C710 248 certified CFM at 6.2 CFM per watt, with a real carbon stage. | Lowest running cost at living-room size | 248CFM smoke AHAM VERIFIDE |
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The picks
Winix AT41
Winix · model AT41
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The best-evidenced pick for a pet household: the highest certified smoke CADR of any mid-price unit here, no ion generator, and a measured zero on ozone.
265 smoke / 259 dust / 244 pollen CFM · 261 PM2.5
- Certified room size
- 410 sq ft
- Energy / year
- 272 kWh
- Electricity / year
- $50
- Air per watt
- 5.6 CFM/W
- Power draw
- 45 W
- Noise
- Not published
- Measured ozone
- 0 ppb
- Filter class
- HEPA-Type
- AHAM rule, 400 sq ft
- Short (267 needed)
No ionizer — filtration only
AHAM classifies this model 'Fan with Filter' — no ion generator, unlike Winix's PlasmaWave line.
265 certified smoke CADR across 410 AHAM-certified square feet, no ion generator, 0.00 ppb carried on its ENERGY STAR sibling entry, and $50 a year. For a mid-size room in a pet household this is the most certified air Winix offers.
The honest con: no washable pre-filter documented, no noise figure, no filter price or interval — and no Amazon listing that names the AT41, so the button below is a tagged search rather than a product link.
Coway Airmega 400
Coway · model Airmega 400 (AP-2015F)
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The Coway that is actually in a certification register: 376 certified smoke CADR, 583 square feet, zero measured ozone. If you want a Coway, this is the one with third-party numbers.
376 smoke / 384 dust / 409 pollen CFM · 380 PM2.5
- Certified room size
- 583 sq ft
- Advertised coverage
- 3,120 sq ft in 60 minutes
- Energy / year
- 366 kWh
- Electricity / year
- $67
- Air per watt
- 6.1 CFM/W
- Power draw
- 66 W
- Noise
- 22-52 dB(A)
- Measured ozone
- 0 ppb
- Filter class
- Composite Filter
- AHAM rule, 500 sq ft
- Clears it (334 needed)
No ionizer — filtration only
ENERGY STAR classifies this unit 'Fan and Filter', 0.00 ppb measured ozone.
376 certified smoke CADR across 583 certified square feet, 0.00 ppb measured, no ion stage, washable pre-filters on both faces, activated carbon for odor, and a published filter price. Our full review.
The honest con: $67 a year against the C710’s $43, ENERGY STAR declines to classify its filter HEPA or HEPA-Type, and its filters cost more per year than its electricity.
Coway Airmega Mighty AP-1512HH
Coway · model Airmega Mighty AP-1512HH
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The most-recommended air purifier in this category, and the one with no third-party CADR to check. Coway's own figures are good; at 77 watts it is also the thirstiest machine here for its output.
233 smoke / 246 dust / 240 pollen CFM
- Certified room size
- 361 sq ft
- Advertised coverage
- 1,748 sq ft in 60 minutes
- Power draw
- 77 W
- Noise
- 24-53 dB(A)
- AHAM rule, 350 sq ft
- Short (234 needed)
Bipolar device — fitted
Coway lists a 'Bipolar Device' as the fourth filtration stage. Because this model is in neither register, there is no independent ozone measurement for it — and Coway does not publish one.
The most recommended machine in the category, and the reason this page exists. Coway’s own figures are 233 CFM and 361 square feet, it documents a washable pre-filter and filter intervals, and it is genuinely well built.
Why it is not a pick: it appears in no certification register we can search, so none of those figures has been checked by anyone but Coway, and its fourth stage is a bipolar ionizing device with no published ozone measurement from any source. The full record on it.
The verdict
Common questions
Is Winix or Coway better for pets?
Do Winix and Coway air purifiers produce ozone?
Which brand is in a certification register?
Which is easier to actually buy?
Sources
- AHAM VERIFIDE directory of certified room air cleaners
- ENERGY STAR certified room air cleaners database
- EPA — Guide to Air Cleaners in the Home
- AHAM — air filtration standards and the two-thirds rule
Figures were read on the dates shown against each source. If one has changed, or if we have got something wrong, tell us and we will correct the page.
Read next
- Pet hair & odorWinix C710 vs Coway Airmega Mighty AP-1512HHThe C710 is AHAM-certified at 248 CFM with a published 235 kWh. The Coway is in no register and draws 77 watts.
- Pet hair & odorBlueair vs WinixBlueair takes air-per-watt by a distance; Winix documents switchable PlasmaWave and washable pre-filters. Which matters depends on how much your animal sheds.
- CADR & costLEVOIT vs CowayBrand-level comparison on certified coverage, running cost and which models are actually in a register.