Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coway - Airmega 400 | Winix - 5500-2 |
|---|---|---|
| Coverage | 60 m² | 33 m² |
| CADR | 705 m³/h | 415 m³/h |
| Min noise | 22 dB | 27 dB |
| True HEPA H13+ | true | false |
Between the Airmega 400 and 5500-2, the Airmega 400 comes out ahead in coverage / cadr, while the 5500-2 wins on several specs. Overall, the Airmega 400 scores 85.4 and the 5500-2 scores 60.1 on our Mars Score.
Which should you buy?
The Airmega 400 is the clear pick on raw spec strength, leading by 25.3 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.
Pick the Airmega 400 if you care most about coverage / cadr. The biggest gaps in its favor are coverage, cadr, min noise, among others. The single most decisive one: Coverage — 81.82% more. 60 m² vs 33 m².
The 5500-2 similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable activated carbon, so those specs do not 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.
Which should you buy: Coway - Airmega 400 or Winix - 5500-2?
Coway - Airmega 400 leads the current Mars Score by 25.3 points.The more useful decision is the trade-off behind that result: compare cadr, coverage, true hepa h13+, min noise against the way you will actually use the product.
Choose Coway - Airmega 400 if…
Coway - Airmega 400 has the measurable edge on coverage m2, cadr m3h, noise db min.
Choose Winix - 5500-2 if…
Winix - 5500-2 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Coway - Airmega 400 wins
- ▲Coverage — 81.82% more. 60 m² vs 33 m².
- ▲CADR — 69.88% more. 705 m³/h vs 415 m³/h.
- ▲Min noise — 5.00 dB less. 22 vs 27.
- ▲Has True HEPA H13+.
Why Winix - 5500-2 wins
- No decisive advantages.
Spec comparison
Performance
| Spec | Coway - Airmega 400 | Winix - 5500-2 |
|---|---|---|
| CADR | 705 m³/hlead | 415 m³/h |
| Coverage | 60 m²lead | 33 m² |
| True HEPA H13+ | truelead | false |
| Activated carbon | true | true |
Smart & Noise
| Spec | Coway - Airmega 400 | Winix - 5500-2 |
|---|---|---|
| Min noise | 22 dBlead | 27 dB |
| Air quality sensor | true | true |
| Smart app | truelead | false |