Coway Airmega Reviews: Which Model to Buy?

For a bedroom or mid-size living room, buy the Coway Airmega Mighty2. It replaces the original AP-1512HH Mighty with a quieter low end, a laser particle sensor and no ionizer, for about $30 more at list. Once a room grows past about 370 sq ft, the Airmega 400 is the Coway that keeps up, at roughly 508 sq ft. If you already own a working Mighty, keep it: the new one doesn't clean meaningfully more air.

None of these three has an app. Coway's pitch is a purifier that reads the room and adjusts itself, and on the Mighty2 that includes dropping to Sleep mode when the lights go out.

Which Coway fits which room?

Model	Smoke CADR	Room size (site rule)	Rated noise	Filters per year	Typical price
Coway Airmega Mighty2 (AP-1512N)	240 CFM	~372 sq ft	19–50 dB	~$70	$230–$270
Coway Airmega AP-1512HH Mighty	233 CFM	~361 sq ft	24–54 dB	~$55–$60	$220–$250 list, often on sale
Coway Airmega 400	328 CFM	~508 sq ft	22–52 dB	~$129	$400–$450

Room sizes are smoke CADR × 1.55, the site-wide rule that works out to about 4.8 air changes an hour at an 8 ft ceiling. Coway's own figures are far larger: 1,800 sq ft for the Mighty2 assumes one air change an hour, and 1,560 sq ft for the 400 assumes two. For a vaulted ceiling or an open stairwell, the room-size calculator adjusts for volume.

Mighty2 vs the original Mighty: what changed

Cleaning power barely moved. The Coway Airmega Mighty2 is rated at 240 CFM for smoke against 233 for the Coway Airmega AP-1512HH Mighty. The changes are in how it behaves at the speeds you actually use:

• Quieter low end. Coway rates the Mighty2 at 19 dB against 24 dB for the original. RTINGS found it performs far better at lower, quieter fan speeds.
• No ionizer. The original's optional ionizer is gone, so there is no setting to second-guess.
• Laser sensor. The MegaScan sensor reads PM1, PM2.5 and PM10. HouseFresh found it reacts much faster than the optical sensors in older Coways.
• Night behavior. A light sensor moves Smart mode to Sleep after three minutes of darkness.
• Less power. Peak draw falls from 77 W to 56 W.
• One filter instead of two. The Mighty2's Max2 cartridge (AP-1512N-FP, $69.99, up to 12 months) combines HEPA and carbon, and the washable pre-filter slides out of the side.

The trade-offs are small but real. At 15.2 lb it is about 3 lb heavier than the original, it has no wheels, and owners point out that the buttons aren't backlit. Our Mighty vs Mighty2 comparison goes through each change. The Mighty vs Mighty2 filter guide explains why the two filters won't swap.

What three years of a Mighty2 costs

At its $269.99 list price, add two Max2 filters ($140) and electricity. HouseFresh measured the Mighty2 at about 10 W on speed 2. Run 24/7 at $0.17/kWh, that is roughly $15 a year. The total comes to about $456 over three years, or less if you catch it on sale.

The original Mighty's filter set costs a little less, about $55 to $60 a year, and the unit itself has been discounted to around $160. At that kind of price it is still a good purifier, provided you leave its ionizer off; our ionizer and ozone guide explains why. At close to full price, the Mighty2 is the better buy.

Large rooms: the Airmega 400

The Coway Airmega 400 runs two full filter stacks, one on each side, to reach a 328 CFM smoke rating. That covers about 508 sq ft, so an 18×26 living room gets a little over five air changes an hour at top speed. It is rated at 22 to 52 dB, draws 66 W at most, and its Max2 filter set costs about $129 a year.

Coway lists it at $649, but it usually sells for $400 to $450. At that price it undercuts a pair of Mighty2 units, which cost about $540 at list and move 480 CFM between them. For an L-shaped space or two connected rooms, a pair of smaller units can do more good than one big tower. For a single open room, the 400's one-box simplicity wins. The Airmega 400S adds Wi-Fi and the app if you want them.

Which Coway Airmega should you buy?

• Bedroom or living room up to ~370 sq ft, buying new: Mighty2.
• Same room, tight budget, original Mighty on a deep sale: AP-1512HH, with the ionizer left off.
• 370 to 510 sq ft: Airmega 400.
• You want an app: the Airmega 400S, or outside Coway the Levoit Vital 200S-P (250 CFM, VeSync app).
• Past ~510 sq ft: two units, or the Levoit Core 600S, rated for about 606 sq ft.

For the brand-level comparison with Coway's biggest value rival, see Coway vs Levoit.

Where these numbers come from

CADR, rated noise, power and filter part numbers come from Coway's spec sheets and filter listings. Measured wattage and sensor behavior come from HouseFresh, and the low-speed performance finding from RTINGS. No AHAM Verifide listing for the Mighty2 turned up in our research, so its CADR is Coway's own figure. Room sizes use the same CADR × 1.55 rule as every other page here, so a Coway lines up directly against a Levoit or Winix.