Coway Airmega 400S Smart Air Purifier Full Review

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Are you in need of a new air purifier that is compatible with your Alexa devices?

The Coway Airmega 400S is a smart air purifier that is controlled through their app, enabled for iOS and Android devices.

In our review of the Coway Airmega 400S, this smart air purifier will be scored on a system that examines its coverage, features, and overall value.

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Get The 400S Today: Check Pricing & Availability


You’ll love Airmega 400S if you:

  • Are looking for smart technology – Perhaps, you want a device that you can control in the palm of your hands or Alexa compatible.
  • Need to schedule your air purifier – Airmega 400S allows you to schedule whenever you need your air purifier on or off at a certain time of the day.

You might not like Airmega 400S if you:

  • Have a smaller room – This air purifier is built for larger rooms, so if you have a smaller room, then this might be overkill.
  • Are on a tight budget – The company builds high quality products, but the technology and features they put into the air purifier gives it the higher price tag.

Want even more air purifier options? Here’s our complete list of reviews.

airmega 400s with family

Specifications and Features

Airmega 400S uses smart technology where you’ll be able to control your device with your phone. The neat thing about that is that with any new features that Coway comes up with, they can update it through their app and you’ll be able to utilize it. A similar concept on how Tesla updates their vehicles.

The 400S is also compatible with Alexa, so if you’ll be able to control with your voice as well.

This specific model can cover large rooms, up to 1,560 sq. ft. If you’re looking for a smaller air purifier, you might want to check out a list of devices perfect for rooms smaller than 1,560 sq. ft, here.

Another neat feature the 400S has is the ability to auto adjust the air filtration speed according to the room’s current air quality. It can detect the air quality in your room, and can switch on the desired levels for filtering the air.

The Coway Airmega 400S also has a eco feature where if the air quality remains at a good level for 10 minutes or so, it’ll conserve energy by shutting down the fan. It will detect air pollution in the air, and it’ll automatically restart.

top view of airmega 400s

Filter Type of Airmega 400S

Coway Airmega 400S uses washable pre-filter and Max 2 Filter Set, which is an activated carbon and green true HEPA filter.

The device has a filter indicator that’ll tell you when you need to replace your filters.

The Max2 filter technology is unique and it traps airborne particles as small as 0.3 micron in size and is treated by natural materials, such as Ginkgo Extract and Japanese Sumac Extract, which is used in anti-allergy and anti-virus treatments.

These filters help remove harmful gases, VOCs (Volatile Organic Compounds), and odors.

airmega 400s max2 filters

What customers are saying about Coway Airmega 400S

There over a hundred reviews on the Airmega 400s, and we try to filter the most important pros and cons of the unit to help you streamline your research on purchasing your air purifier:

The Good:

  • Uses 2 filters to help with air quality.
  • Has smart technology features.
  • You’ll be able to schedule your device.
  • Excellent customer service.
  • Looks beautiful and fits in almost any location.

The Bad:

  • Expensive piece of device.
  • Noise level can be loud for some.

Other Considerations

  • Limited Warranty – 1 year of limited warranty for any internal/functional parts, and 5 years of limited warranty for motor and electronic parts.
  • Designed in USA, Made in Korea

Coway Airmega product overview video


Final Thoughts

Coway’s Airmega 400S is a terrific air purifier, but at a higher cost. With our current generation and where its headed, everything is going to be controlled through Alexa or your phone.

This unit allows you to control your air quality through an app on your phone, no matter where you are in the world. The features are also unique to its kind, allow it to detect any bad air, and having it to auto adjust its filtration speed based on its environment.

Coway believes that your health is more important than the price you have to pay.

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Want More Information? Check Amazon’s Airmega 400S Product Page

9.3 Total Score

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