Review
Coway Airmega AP-1512HH Mighty Review
Coway publishes something almost nobody else does: what the machine draws at each fan speed. That single disclosure is most of the case for buying it.
By Scooter M. · Published · Last updated
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The short answer
Buy it to leave running. Coway publishes power draw for every fan speed - 0.3 W on standby, 3.7 W on speed one, 8.7 W on speed two, 75.3 W on speed three. Run continuously on speed one that is about $5.94 a year. Run continuously on speed three it is about $120.97. Almost no other manufacturer gives you the figures to work that out, and it is the difference between a cheap appliance and an expensive one.
The specification nobody else publishes
Every purifier maker quotes a wattage. Almost all of them quote one number, which is the maximum, on the top fan speed, which is not how anyone runs a purifier for long. Coway breaks it out by speed, and the spread is the most important fact about this machine:
| Setting | Power draw | Cost to run 24/7 for a year |
|---|---|---|
| Standby | 0.3 W | About $0.48 |
| Speed 1 | 3.7 W | 32.4 kWh = about $5.94 |
| Speed 2 | 8.7 W | 76.2 kWh = about $13.97 |
| Speed 3 | 75.3 W | 659.6 kWh = about $120.97 |
A twentyfold spread between the lowest and highest setting means the fan speed you choose matters more to your bill than which purifier you bought. It also means the auto mode’s behavior is a genuine unknown in the running cost: if it sits on speed three whenever it detects something, you are on the expensive end of that table without deciding to be.
Cleaning rate and what it really covers
Coway publishes CADR of 233 CFM smoke, 246 dust, 240 pollen. Size on the smoke figure, because it is the smallest test particle and therefore the hardest. Under AHAM’s two-thirds rule, 233 CFM covers about 350 sq ft at a standard ceiling.
Coway also publishes coverage at three air change rates - 1,748 sq ft at 1 ACH, 874 at 2 ACH, and 361 at 4.8 ACH. Publishing the whole curve rather than only the flattering end is unusually straight, and the 361 sq ft figure is the one to buy against. The rule and the adjustments are at CADR explained.
The filter stack, and why the carbon stage matters here
Four stages: a washable pre-filter, a deodorization filter, a Green True HEPA filter, and a bipolar device. The part worth paying attention to is that the deodorization filter is a separate component with its own six-month replacement life, against the HEPA filter’s twelve months.
That structure tells you something real. A manufacturer that expects the carbon to saturate before the HEPA loads up is a manufacturer treating carbon as a genuine consumable rather than a coating on the pre-filter - which is the single best available signal that there is enough carbon to do something about odor. We set out how to read that signal generally in activated carbon explained.
The practical consequence: three parts a year, two deodorization filters and one HEPA. Price them before you buy the body, because on a unit in this bracket a few years of filters is comparable to the purchase price.
The stage we would switch off
The bipolar device is an ionizing stage. Our position across this site is consistent: where such a stage is optional we switch it off and rely on the mechanical filtration, which is the part with a published measurement standard behind it. The EPA notes that electronic air cleaners can produce ozone, a lung irritant, in amounts that vary between models. The full argument is at air purifier vs ionizer.
Check you can actually disable it on the unit you receive before treating that as settled.
Who should not buy it
- Anyone running it in short bursts on high. Its 75.3 W top speed is the highest among the units we carry. The whole advantage here is low-speed efficiency over long hours; short bursts on speed three give that back and then some.
- Anyone treating a room under about 220 sq ft. The extra capacity buys nothing the room can use.
- Anyone whose problem is damp, dryness or mold. A purifier does not change moisture in either direction: which device do I need.
- Anyone who would rather not own an ionizing stage at all, even a disableable one.
The verdict
If a purifier is going to live in your home switched on, this is the one we would buy, and the reason is disclosure rather than performance: Coway tells you what it costs at the setting you will actually use, and backs the odor claim with a carbon filter that has its own schedule. Its cleaning rate is a statistical tie with the obvious alternative, which we put side by side in Core 400S vs Coway Mighty. Deduct for the top-speed draw and for an ionizing stage we would rather was not there.
What we would buy for this
Chosen from the same registry as our roundups, on published specifications and computed running cost.
Coway Airmega AP-1512HH Mighty
Running continuously in a medium room
The most efficient unit here at low speed - 3.7 W on speed one - which matters enormously if you leave a purifier running all day and almost not at all if you do not.
#ad Price as of October 18, 2026, from Amazon. Prices change. How we make money.
Published specifications
| Specification | Value | Source |
|---|---|---|
| CADR (smoke) | 233 CFM | Coway published specification |
| CADR (dust) | 246 CFM | Coway published specification |
| CADR (pollen) | 240 CFM | Coway published specification |
| Coverage | 361 sq ft at 4.8 air changes/hr (1,748 sq ft at 1 ACH) | Coway published specification |
| Power draw by speed | 0.3 W standby / 3.7 W speed 1 / 8.7 W speed 2 / 75.3 W speed 3 | Coway published specification |
| Filtration | Pre-filter, odor filter, Green True HEPA, bipolar device | Coway published specification |
What it costs to run
About $6 a year running 24/7 on speed one, or $121 a year running 24/7 on speed three.
Speed 1: 3.7 W / 1000 x 24 x 365 = 32.4 kWh = $5.94 a year. Speed 3: 75.3 W / 1000 x 24 x 365 = 659.6 kWh = $120.97 a year. That twenty-fold spread is the most important number on this page, and it is why we chase per-speed figures instead of accepting a single rated wattage.
What is good about it
- Coway publishes power draw per fan speed, which almost nobody does and which is the only way to compute a real running cost
- 3.7 W on speed one is remarkable - cheaper to run continuously than most nightlights
- Coverage published at 1, 2 and 4.8 air changes per hour, so you can size it honestly
What is not
- 75.3 W on speed three is the highest draw here; how the auto mode behaves decides your bill
- The bipolar device is a stage we would rather do without; check it can be disabled
Who should skip this
Skip this if you only run a purifier for an hour or two at a time. Its whole advantage is low-speed efficiency over long hours, and short bursts on high speed give that straight back.
How it scored
- Clean air per watt9.5
- Honest coverage claim9.5
- Quiet operation8.0
- Filter economics7.5
Overall 8.7 / 10. This is our editorial score from published specifications and computed running cost. It is not a test result, and it is deliberately not marked up as a rating in this page’s structured data.
Levoit Core 400S
Living rooms and open-plan spaces
The one to buy if you want a purifier that genuinely covers a living room, and one of the few spec sheets in this bracket that publishes coverage at a useful air-change rate rather than only the flattering one.
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Published specifications
| Specification | Value | Source |
|---|---|---|
| CADR | 231 CFM | Levoit published specification |
| Coverage | 358 sq ft at 4.8 air changes/hr (1,718 sq ft at 1 ACH) | Levoit published specification |
| Rated power | 38 W | Levoit published specification |
| Noise | 22-52 dB | Levoit published specification |
| Filtration | 3-stage: pre-filter, HEPA, activated carbon | Levoit published specification |
| Dimensions | 10.8 x 10.8 x 20.5 in, 11 lb | Levoit published specification |
What it costs to run
About $25-30 a year in electricity at 12 hours a day, before filters.
38 W / 1000 x 12 hours x 365 days = 166.4 kWh. At 18.34 cents/kWh that is $30.52 a year at rated power - and the unit only draws its full 38 W on the top fan speed, so a mid setting lands nearer $25. Add the replacement filter, which you should price before you buy rather than after.
What is good about it
- Levoit publishes coverage at both 1 ACH and 4.8 ACH, which is unusually straight - most brands quote only the flattering 1 ACH number
- 38 W is low for this CADR, which is what keeps the running cost down
- 22 dB on its lowest setting is quiet enough to sleep beside
- Carbon, pet-allergy and smoke-specific replacement filters are sold for the same body
What is not
- We could not find a published filter replacement interval in Levoit's specification, so we are not quoting one
- The 1,718 sq ft headline is a single air change per hour, which is not a useful rate for allergies
Who should skip this
Skip this if your room is under 200 sq ft. The Core 300S covers that at lower power and lower cost, and the extra CADR buys you nothing in a small bedroom.
How it scored
- Clean air per watt9.0
- Honest coverage claim9.5
- Quiet operation8.5
- Filter economics7.5
Overall 8.6 / 10. This is our editorial score from published specifications and computed running cost. It is not a test result, and it is deliberately not marked up as a rating in this page’s structured data.
How we ranked these
We have not tested these units. Nobody here owns one. What we did was compile each manufacturer’s published specifications, check the coverage claims against AHAM’s room-sizing rule, and compute what each one costs to run for a year at the current US average electricity price. Every figure on this page is attributed to whoever published it, and the arithmetic is shown so you can redo it.
How we rank these sets out the full method, including what would change a ranking.
Questions people ask
+−How much does the Coway AP-1512HH cost to run?
About $5.94 a year running 24/7 on speed one, and about $120.97 on speed three, at 18.34 cents per kWh. That twentyfold spread is why the fan speed you choose matters more than which purifier you bought.
+−What room size does the Coway Mighty cover?
About 350 sq ft under AHAM’s two-thirds rule on its 233 CFM smoke CADR, and Coway itself publishes 361 sq ft at 4.8 air changes per hour. The 1,748 sq ft figure is quoted at one air change per hour.
+−How often do the Coway filters need replacing?
Coway publishes a six-month life for the deodorization filter and a year for the HEPA, so three parts a year. The pre-filter is washable and reusable.
+−Should I turn off the bipolar ionizer?
We would. The mechanical filtration is the part with a measurement standard behind it, and the EPA notes electronic air cleaners can produce ozone in amounts that vary between models. Confirm the stage can be disabled on your unit.
+−Is the Coway good for cooking and pet smells?
It is the better of our two main purifier picks for odor, because the deodorization filter is a separate component with its own replacement interval rather than a carbon layer inside a combined cartridge. Expect to replace it on schedule against a continuous source. A dorm room or a small office has the same shape of problem with different rules attached - purifiers for offices and dorm rooms.