Coway
Coway Airmega 400S App-Enabled Smart Air Purifier (Covers 1,560 sq. ft.), True HEPA Air Purifier with Smart Technology, Compatible with Amazon Alexa and Google Home, (111012)
Best smart air purifier for large open-concept living spaces.
Breathe easier with the Coway Airmega 400S, a smart air purifier engineered for large homes. This powerful unit effectively cleans spaces up to 1,560 sq. ft., ensuring a healthier environment for your family. Its advanced two-stage filtration system captures dust, allergens, and odors. Connect via Wi-Fi to monitor air quality in real-time and control settings remotely using the Airmega app or voice commands with Alexa and Google Home. Enjoy automated operation that adapts to your air quality, making clean air effortless.
$599.99
Owner Satisfaction
4.7
/ 5
Category Rank
3
/ 717
#3 in Air Purifiers
Price vs Category Average
+115%
Above average
Room Coverage
31202901
/ , ft² ( m²) at air change/hour
Who it's for
- Homeowners with expansive open-concept living areas
- Allergy sufferers needing comprehensive air purification
- Tech-savvy users who prioritize smart home integration
Who should skip it
- Budget-conscious buyers with limited floor space
- Shoppers looking for low long-term maintenance costs
- Light sleepers sensitive to fan noise during operation
Performance breakdown
Purification Capacity
Handles massive living spaces with impressive air exchange rates.
Filtration Efficiency
Dual-stage system captures microscopic particles and stubborn household odors effectively.
Smart Integration
Seamless app connectivity and voice control make air management effortless.
Acoustic Performance
Whisper-quiet operation ensures minimal disruption even in high-speed modes.
Maintenance Convenience
Long-lasting filters reduce the frequency of hands-on upkeep.
Automation Intelligence
Responsive sensors adjust fan speeds instantly based on real-time air quality.
Key Specs
Room Coverage
3,120 ft² (290 m²) at 1 air change/hour
CADR
328 (Smoke), 328 (Dust), 400 (Pollen)
Filter Composition
Washable Pre-Filter + Max2 Filter Set (Activated Carbon + HEPA)
Max2 Filter Life
12 months
Dimensions
14.8 x 22.8 x 14.8 in
Noise Level
22~52 dB(A)
Weight
23.1 lbs
Coverage Area
1,560 sq. ft.
Features
- Cleans large rooms up to 1,560 sq. ft.
- Smart Mode for automatic air quality adjustment
- Real-time air quality monitoring via app
- Voice control with Alexa and Google Home
- Wi-Fi enabled for remote app control
- Dual HEPA and Activated Carbon filtration
- User-friendly interface with indicator panel
- Timer and scheduler functions
What customers say
The Coway Airmega 400S earns high praise for its powerful air purification, effectively clearing odors and allergens across large, open spaces. Users consistently note significant improvements in air quality and sleep. Its sleek design integrates well into modern homes, and the unit operates quietly on lower settings, making Smart Mode convenient for daily use. While the initial purchase price is substantial, the recurring cost of proprietary filters slightly tempers the long-term value perception. Connectivity features are appreciated, though some users report minor setup or connection issues. Overall, the core performance in delivering clean air is rated outstanding, confirming its status as a premium appliance.
Know before you buy
The Airmega 400S is designed for large spaces, providing optimal performance in rooms up to 1,560 square feet with four air changes per hour. It can cover up to 3,120 square feet if you require one air change per hour.
No, the unit functions perfectly as a standalone air purifier using the manual controls on the device. Wi-Fi is only required if you wish to use the mobile app, remote scheduling, or voice control features.
The Max2 filter set, which combines the HEPA and activated carbon layers, is designed to last approximately 12 months depending on your environment. The pre-filter is washable and should be cleaned periodically to maintain airflow efficiency.
Yes, the unit operates between 22 and 52 dB(A). At its lowest setting, it is very quiet and suitable for use in bedrooms or quiet living spaces.
Smart Mode uses an onboard air quality sensor to monitor your environment in real-time. It automatically adjusts the fan speed based on the detected level of pollutants, ensuring your air stays clean without you needing to manually change settings.
Yes, the Airmega 400S is compatible with both Amazon Alexa and Google Home. Once connected, you can use voice commands to check air quality or adjust fan speeds.
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