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Coway

Coway Airmega 400S

The AIRMEGA 400S Air Purifier by Coway is an excellent choice for those needing to purify large spaces and appreciate smart home integration with Alexa. While it boasts strong filtration capabilities and a variety of operational modes, some users have encountered issues with the app and smart features. Overall, it is a solid air purifier for those who prioritize powerful air cleaning and don't mind higher replacement filter costs.

Model: 111012Color: WhiteUPC: 826439150006
Lowest at Amazon
$509.00 at Amazon
Lowest at any Popular Retailer
$509.00 at Amazon

Where to Buy

Prices last updated: April 27th 2026 2:37 am

Pros

  • Covers a large area of up to 1560 sq. ft.
  • Compatible with Alexa, allowing for voice control and smart home integration.
  • Features washable mesh prilters, reducing the need for frequent replacement.
  • Utilizes HEPA and activated carbon filters for effective air purification.
  • Smart mode and auto mode for efficient and adaptive operation.
  • Comes with a ear warranty for customer assurance.
  • Provides detailed air quality insights through the Coway IoCare app.
  • Quiet operation, even at medium speed (50 db).

Cons

  • Some users reported issues with the app and smart functionality.
  • Replacement filters are relatively expensive (~$120/year).
  • Requires strategic placement to cover larger areas effectively.
  • The unit is heavy (25 pounds), which might be cumbersome to move around.
  • Mixed reviews on the effectiveness of the air quality sensor.

Bottom Line

The AIRMEGA 400S Air Purifier by Coway is an excellent choice for those needing to purify large spaces and appreciate smart home integration with Alexa. While it boasts strong filtration capabilities and a variety of operational modes, some users have encountered issues with the app and smart features. Overall, it is a solid air purifier for those who prioritize powerful air cleaning and don't mind higher replacement filter costs.

Read full expert review

What Reviewers Are Saying

Praised
easy to use15%
quiet performance15%
good design15%
effective air cleaning25%
filter change indicator10%
good after sales support10%
Criticized
costly filters15%
wifi function not working20%
notification light too bright15%

Discussion

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