PureCoway Airmega 400 Review
The Coway Airmega 400 is our large-room pick — high CADR, dual-intake true-HEPA + carbon, and surprisingly quiet for its output. Our 2026 review of its strengths and price.
Last updated: July 2026 · By the PureAir Lab editorial team
Quick verdict
The Airmega 400 clears large, open spaces fast thanks to strong airflow and a dual-sided intake, while a trustworthy auto mode and clear air-quality readout make it easy to leave running. True-HEPA + carbon covers the essentials. The catch is the premium price and large footprint.
| Spec | Coway Airmega 400 |
|---|---|
| Filter | True-HEPA + activated carbon (dual intake) |
| Coverage | Up to ~1560 sq ft |
| Noise | ~22 dB (low) to ~52 dB (high) |
| Smart | Air-quality sensor + auto |
| Best for | Large rooms, wildfire smoke |
What we like
- High CADR clears big rooms quickly.
- Dual-sided intake and quiet operation for the airflow.
- Reliable auto mode with a readable display.
What we don't
- Premium price and a large footprint.
Who it's for
Large living rooms, open-plan spaces and wildfire-smoke defense. For smaller rooms, the cheaper AP-1512HH is plenty.
FAQ
Is the Coway Airmega 400 worth it?
For large or open-plan rooms, yes — its high CADR and quiet operation make it our large-room pick. For smaller rooms it's overkill; the AP-1512HH is better value.
What room size does it cover?
Rated up to about 1560 sq ft, though for strong cleaning aim to use it in rooms up to ~800 sq ft.
Airmega 400 vs AP-1512HH?
The 400 covers far more and clears big rooms faster; the AP-1512HH is smaller, cheaper and ideal for a bedroom or medium living room.