Coway Airmega 400 vs Airmega Mighty AP-1512HH
The same manufacturer sells one machine with third-party numbers and one without. For a pet household that difference decides it.
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Buy the Airmega 400 if the room is over about 350 square feet: 376 certified smoke CADR across 583 certified square feet, 0.00 ppb measured ozone, no ion generator. The Mighty claims 233 CFM, is in no certification register, publishes no certified energy use and ships an unmeasured bipolar stage.
Comparisons on this site usually run across brands. This one runs inside a single brand, which makes it unusually clean: same company, same design philosophy, same retail channels — and two completely different states of evidence.
The numbers, side by side
| Airmega 400 | AP-1512HH Mighty | |
|---|---|---|
| Smoke CADR | 376 CFM | 233 CFM |
| Dust CADR | 384 CFM | 246 CFM |
| Pollen CADR | 409 CFM | 240 CFM |
| Verified by | ENERGY STAR | Nobody — Coway's own figures |
| Certified room size | 583 sq ft | 361 sq ft (Coway's own) |
| Advertised coverage | 3,120 sq ft in 60 minutes | 1,748 sq ft in 60 minutes |
| Annual energy (certified) | 366 kWh | Not published |
| Electricity per year | $67 | Not published |
| Power draw | 66 W | 77 W |
| Measured ozone | 0.00 ppb | Not published |
| Ionizer | None | Bipolar device |
| Filter class (register) | Composite Filter | Not classified |
| Washable pre-filter | Yes | Yes |
| Published filter interval | 12 months, Max2 filter set | 12 months HEPA, 6 months deodorization |
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.
On output, this is not a close comparison
376 against 233 smoke CADR is 61% more air. 583 against 361 square feet is the same gap expressed as coverage. Unlike most pairs on this site, these two are not interchangeable machines at different prices — they are aimed at genuinely different rooms.
Under AHAM’s two-thirds rule a 500 square-foot open-plan space asks for 334 CFM. The Airmega 400 clears it. The Mighty is not close, and buying the Mighty for that room is the single most common sizing mistake in this category — the calculator settles it in about ten seconds.
On evidence, they are in different categories
The Airmega 400 is listed in EPA’s ENERGY STAR room air cleaner database, which requires testing to ANSI/AHAM AC-1 through an EPA-recognized certification body and additionally publishes measured ozone emissions and certified annual energy use. Its ozone reading is 0.00 ppb and its technology classification is fan and filter — no ion generator.
The AP-1512HH is in neither that database nor AHAM’s directory. That does not make its figures wrong. It makes them unchecked, and it means the fourth filtration stage Coway describes as a “Bipolar Device” has no published ozone measurement from Coway or from anybody else.
Where the Mighty still has an edge
Less than an earlier version of this page claimed. We originally credited the Mighty with two documentation advantages; Coway’s own Airmega 400 specification shows the larger machine has both, so they do not separate the two. Both document a washable pre-filter — the part that matters most in a shedding household — and the units that document one are still a short list.
What genuinely remains is the odor stage. The Mighty schedules its deodorization filter separately, on a six-month cycle alongside a twelve-month HEPA stage. The Airmega 400 bundles carbon into a single Max2 set on one twelve-month cycle. In a household with a litter box, a separately replaceable carbon stage is a real if modest advantage — and the Mighty is simply the right size for a smaller room.
Quick picks
Both Coway models, plus the machine we would put in a pet bedroom instead.
| # | Product | Best for | Certified CADR | Price |
|---|---|---|---|---|
| 1 |  The Coway with third-party numbers Coway Airmega 400 376 certified CFM across 583 sq ft, 0.00 ppb ozone, no ion generator. | Large rooms, verified Coway | 376CFM smoke ENERGY STAR verified | |
| 2 |  What we would buy at mid size Winix C710 248 certified CFM, AHAM listed, 235 certified kWh, no ionizer. | Lowest running cost at living-room size | 248CFM smoke AHAM VERIFIDE | |
| 3 |  The popular one, unverified Coway Airmega Mighty AP-1512HH 233 CFM claimed, in no register, with an unmeasured bipolar stage. | The popular default, unverified | 233CFM smoke Manufacturer-claimed |
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The picks
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, with 0.00 ppb measured ozone and no ion generator. At 6.1 CFM per watt and $67 a year it is mid-pack on efficiency, and for a genuinely large pet household it is a sound Coway to buy — though the Airmega 450 beats it on certified airflow and efficiency, and its own review has the full running-cost arithmetic.
The honest con: ENERGY STAR records the filter as a “Composite Filter” and does not classify it HEPA or HEPA-Type at all, so the filter-grade comparison this site normally makes cannot be made. Coway publishes both a one-year interval and a price for its Max2 filter set, which is rare and welcome, but the bill it adds up to — $129 a year — is larger than the 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 air purifier in this category, and on Coway’s own numbers a capable mid-size machine — 233 CFM across 361 square feet, with a washable pre-filter and a separately scheduled deodorization stage.
The honest con: no register, no certified energy figure, 77 watts — the highest draw for its output of anything we cover — and a bipolar ionizing stage nobody has measured. We are not saying it is a bad machine. We are saying you cannot check it, and there are machines at this size you can.
Winix C710
Winix · model C710
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Nearly the same air movement as the AT41 for a third less electricity a year. If you can find it, it is the cheapest certified 380-plus square-foot unit to run.
248 smoke / 252 dust / 262 pollen CFM · 250 PM2.5
- Certified room size
- 384 sq ft
- Energy / year
- 235 kWh
- Electricity / year
- $43
- Air per watt
- 6.2 CFM/W
- Power draw
- 45 W
- Noise
- Not published
- Measured ozone
- 1 ppb
- Filter class
- HEPA-Type
- AHAM rule, 350 sq ft
- Clears it (234 needed)
No ionizer — filtration only
AHAM classifies this model 'Fan with Filter'.
For a mid-size pet room this is the comparison the Mighty actually loses: 248 certified smoke CADR across 384 AHAM-certified square feet, no ion generator of any kind, and a certified 235 kWh a year at $43. That is more certified air than the Mighty claims, from a register you can search, on a machine that draws 45 watts against 77.
The honest con: ENERGY STAR classifies its filter HEPA-Type rather than HEPA and measures 1 ppb of ozone rather than zero, and Winix documents neither a washable pre-filter nor a filter interval for it — which in a shedding household is exactly where the Mighty pulls ahead. The C710 against the Mighty in full.
The verdict
Common questions
Which Coway should I buy?
Is the Airmega 400 worth the step up from the Mighty?
What about the Airmega 400S?
Does the Mighty's bipolar device produce ozone?
Sources
- ENERGY STAR certified room air cleaners database
- AHAM VERIFIDE directory of certified room air cleaners
- Coway Airmega Mighty AP-1512HH specification
- EPA — Guide to Air Cleaners in the Home
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 allergiesLEVOIT Core 400S vs Coway Airmega Mighty AP-1512HHThe Core 400S is ENERGY STAR verified at 358 sq ft and 38 W. The Coway is in no register and draws 77 W.
- CADR & costLEVOIT vs CowayBrand-level comparison on certified coverage, running cost and which models are actually in a register.
- Pet allergiesThe Best Air Purifiers for PetsCertified CADR picks for a pet household, with annual running cost computed and every ionizer disclosed.
- Pet hair & odorCoway Airmega Mighty AP-1512HH ReviewCapable on Coway's own numbers, with a washable pre-filter and published filter intervals — but in no register, at 77 watts, with an unmeasured ionizing stage.
- Room sizeCoway Airmega 400 vs Airmega 450443 certified CFM against 376 on only 6% more energy, plus a HEPA-Type classification the 400 lacks. Under 564 sq ft, the 400 is still enough.
- Pet allergiesCoway Airmega 400 Review376 certified CFM, 583 sq ft, 0.00 ppb and a washable pre-filter — plus the only complete running-cost figure on this site, because Coway publishes both halves.
- Pet allergiesCoway Airmega 400S vs Airmega 400Identical published specs, identical filter, identical dimensions. The 400 is certified at 376 CFM across 583 sq ft; the 400S is in no register at all.