Coway Airmega 400S vs Dyson Purifier Cool
Side-by-side comparison of features, pricing, ratings, and alternatives.
The Coway Airmega 400S is a smart HEPA air purifier designed for large rooms. It features real-time air quality sensing and advanced filtration technology to capture 99.97% of particles as small as 0.3 microns. With its sleek and modern design, it is perfect for living rooms, bedrooms, and offices. The Airmega 400S is also Wi-Fi enabled, allowing users to monitor and control the air quality remotely through the Coway IoCare app.
The Dyson Purifier Cool combines a bladeless fan with a fully sealed HEPA H13 and activated carbon filtration system, capturing 99.95% of particles as small as 0.1 microns while also cooling the room using Dyson's Air Multiplier technology. A built-in laser particle sensor continuously monitors air quality and automatically adjusts purification intensity, displaying real-time pollutant levels including PM2.5, PM10, VOCs, and NO2 on the LCD screen or the Dyson Link app. Auto mode reacts to changing air quality throughout the day, while Night Mode dims the display and runs at a quieter airflow setting for undisturbed sleep, and the bladeless design is safer around children and pets than traditional fan blades.
Around $549.99 MSRP.
- Advanced HEPA filter captures 99.97% of particles as small as 0.3 microns
- Real-time air quality sensing and monitoring
- Wi-Fi enabled for remote control and scheduling
- Quiet operation with a noise level of 22-52 dB
- Genuinely dual-purpose (cooling + purifying)
- Effective, sealed HEPA filtration
- Useful real-time air quality data
- Safer bladeless design
- Filter replacement can be expensive
- Limited coverage area compared to some other models
- No built-in ionizer or UV light
- Premium price versus separate fan + purifier
- Replacement filters add ongoing cost
- Less powerful cooling than a dedicated large fan
What reviewers say
Coway Airmega 400S Reviews
No reviews yet.
Dyson Purifier Cool Reviews
4.7 (3)Does exactly what we need
Been a regular user of Dyson Purifier Cool for a while now. Safer bladeless design. One minor gripe: premium price versus separate fan + purifier, but it hasn't been a dealbreaker. Would recommend.
Highly recommend Dyson Purifier Cool
Been a regular user of Dyson Purifier Cool for a while now. Effective, sealed HEPA filtration. No major complaints so far. Would recommend.
Highly recommend Dyson Purifier Cool
I picked up Dyson Purifier Cool a while back and haven't looked back. Effective, sealed HEPA filtration. No major complaints so far. Would recommend.
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Alternatives to Dyson Purifier Cool
View all →The Verdict
AI-generated from listing dataBoth units cost about the same, but the Coway Airmega 400S purifies a much larger area and runs quieter, while the Dyson Purifier Cool adds a bladeless fan for cooling but covers a smaller space.
Key differences
- •Coverage: Coway handles up to 1,560 sq ft; Dyson’s coverage is not specified and is smaller.
- •Cooling: Dyson includes a bladeless fan for personal cooling; Coway has no cooling function.
- •Noise: Coway operates at 22‑52 dB; Dyson’s noise level is not provided.
- •Filtration: Both use sealed HEPA filters, but Coway specifies 99.97% capture at 0.3 µm; Dyson lists H13 HEPA without exact capture rate.
- •Smart ecosystem: Coway uses its IoCare app; Dyson integrates with Dyson Link, Alexa, and Google Assistant.
Pricing & value
Both list a one‑time price around $549; ongoing filter costs are noted for each.
Coverage area
Coway explicitly covers up to 1,560 sq ft; Dyson’s coverage is not specified and implied smaller.
Noise level
Coway states 22‑52 dB; Dyson provides no noise specification.
Size & footprint
Dyson’s bladeless design is generally slimmer than Coway’s 14.8×14.8×22.8 in dimensions.
Features
Dyson adds cooling, laser sensor, Night Mode; Coway focuses on air quality sensing only.
Ease of maintenance
Coway includes a filter‑replacement indicator; Dyson mentions filter cost but no indicator.
Warranty
Coway offers a 5‑year limited warranty; Dyson’s warranty period is not provided.
Choose Coway Airmega 400S if…
Large rooms or offices needing quiet, high‑capacity purification without cooling.
Choose Dyson Purifier Cool if…
Households that want combined fan‑cooling and purification for smaller spaces.
Common questions
Which unit covers a larger area?
Coway Airmega 400S is rated for up to 1,560 sq ft; Dyson’s coverage is not specified and is smaller.
Do both units provide smart app control?
Yes. Coway uses the IoCare app; Dyson uses the Dyson Link app and works with Alexa and Google Assistant.
Is there a cooling function?
Only the Dyson Purifier Cool includes a bladeless fan for personal cooling; Coway has no cooling capability.