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.
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
V Vevolar | $79.99 | Mar 14, 2023, may have changed | Buy Now |
W wikdeal | $499.00 | Jul 9, 2023, may have changed | Buy Now |
 Amazon Sold by Amazon.com | $509.00 | Mar 3, 2025, may have changed | Buy Now |
 Bed Bath & Beyond | $549.99 | Nov 29, 2022, may have changed | Buy Now |
J javariya | $551.65 | Feb 10, 2023, may have changed | Buy Now |
Prices are collected from retailer listings; each row shows the date we last saw that price. Return and shipping terms are each store's standard policy from our retailer research (April 2026). Some products and categories have different terms, so check with the store before you buy.
Used & Refurbished
✨ See 3 used & refurbished prices with ShopSavvy ProGet the app →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 pre-filters, 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 5-year 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.
What Reviewers Are Saying
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Discussion
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