Our Verdict
Coway Airmega 400 Wins

It offers superior air purification with a CADR of 328 for smoke and 1,560 sq. ft. coverage, unlike Dyson's zero. Choose Dyson if you prioritize a cooling fan over pure air cleaning performance.
Bottom Line: Coway Airmega 400 is the better choice. It offers superior air purification with a CADR of 328 for smoke and 1,560 sq.
Key Differences
The most significant spec differences at a glance
Cadr Smoke
100% moreCoverage Sq Ft
100% moreAdvantages
Where each product wins
Coway
- Cadr Smoke: 100% higher (328.0 vs 0)
- Coverage Sq Ft: 100% higher (1560.0 vs 0)
Who Should Buy Which?
Find the right product for your needs
Buy Coway if...
Coway AP-2015F Airmega 400
The ideal buyer for the Coway Airmega 400 is someone prioritizing robust, dedicated air purification for large spaces up to 1,560 sq. ft. If you need efficient removal of 99.999% of airborne particles, excellent VOC reduction, and a low minimum noise level of 22 dB, this is your choice. It's perfect for those with allergies, pets, or large open-plan homes who value documented performance and energy efficiency over additional features like cooling.
Buy Dyson if...
Dyson Purifier Cool™ Autoreact
The Dyson Purifier Cool Autoreact TP7A is perfect for buyers seeking a multi-functional device that combines air purification with cooling capabilities. If you live in a smaller space and value convenience, modern design, and the ability to choose between direct or diffused airflow, this is ideal. It suits those who appreciate smart sensors for automatic air quality adjustment and don't require the extensive room coverage or specific CADR performance metrics of a dedicated purifier, instead preferring a two-in-one solution.
Spec Comparison
8 specs compared
| Specification | ![]() | ![]() |
|---|---|---|
| Price | $349 | $414 |
| Rating | 4.4(6.5k) | 4.4(170) |
| Cadr Smoke | 328 | 0 |
| Coverage Sq Ft | 1560 | 0 |
| Noise Level db Min | 22 dB | — |
| Weight | 24.7 lbs | — |
| Energy Star | Yes | — |
| Filter Type | True HEPA | — |
| Smart Sensor | Yes | Yes |
| Noise Level db Max | 52 dB | — |
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Pros & Cons
Quick overview of strengths and weaknesses
Coway AP-2015F Airmega
- Covers 1,560 sq. ft. in 30 minutes.
- Filters 99.999% of 0.01-micron airborne particles.
- Reduces 99% of VOCs and odors effectively.
- Automatically adjusts fan speed to optimize air quality.
- Maximum noise level reaches 52 dB.
- Requires periodic filter replacement and cleaning.
- Unit weighs 24.7 lbs.
Dyson Purifier Cool™
- Automatic air purification
- Provides cooling airflow
- 360-degree filtration system
- User selects direct or diffused airflow
- Zero CADR rating for smoke
- No specified room coverage area
Frequently Asked Questions
Common questions about this comparison
Which is better for large rooms?
The Coway Airmega 400 is better for large rooms, covering 1,560 sq. ft. with a CADR of 328 for smoke. The Dyson Purifier Cool does not specify room coverage, making it less suitable for larger areas.
What's the main difference in air purification performance?
The Coway Airmega 400 provides clear performance metrics with a 328 CADR for smoke and 1,560 sq. ft. coverage. The Dyson Purifier Cool lacks specified CADR or coverage, indicating a less quantifiable purification focus.
Is the Dyson's higher price ($385 vs $349) worth it?
The Dyson's higher price is worth it if you need both air purification and a cooling fan in one device. For dedicated, high-performance air purification based on specific metrics, the Coway offers better value.
Which unit is quieter?
The Coway Airmega 400 specifies a minimum noise level of 22 dB, indicating very quiet operation. The Dyson Purifier Cool does not provide specific noise level figures, which might imply higher minimum noise due to its fan function.
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