Between the Airmega 200M and Airmega 400, the Airmega 200M comes out ahead in several specs, while the Airmega 400 wins on coverage and cadr. Overall, the Airmega 200M scores 56.3 and the Airmega 400 scores 78.3 on our Mars Score.
Which should you buy?
The Airmega 400 is the clear pick on raw spec strength, leading by 22.0 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
The Airmega 200M doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the Airmega 400 if you care most about coverage and cadr. Its strongest claims are coverage, cadr, min noise.
Both ship with comparable true hepa h13+, activated carbon, so those specs don't separate the two — focus on the differences below.
Bottom line: the Airmega 400 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Coway - Airmega 200M wins
- No decisive advantages.
Why Coway - Airmega 400 wins
- ▲Coverage — 81.82% more. 60 m² vs 33 m².
- ▲CADR — 76.25% more. 705 m³/h vs 400 m³/h.
- ▲Min noise — 3.00 dB less. 22 vs 25.
Spec comparison
Performance
| Spec | Coway - Airmega 200M | Coway - Airmega 400 |
|---|---|---|
| CADR | 400 m³/h | 705 m³/hlead |
| Coverage | 33 m² | 60 m²lead |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Coway - Airmega 200M | Coway - Airmega 400 |
|---|---|---|
| Min noise | 25 dB | 22 dBlead |
| Air quality sensor | true | true |
| Smart app | false | truelead |
Frequently asked
Spec-level deep dives
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