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Seeing an air purifier in someone’s house has nowadays become more of a normal occurrence than a rare find, and this is because more and more people are becoming aware of the increased amount of air pollution that is causing a significant decrease in most people’s indoor air quality. As a result, units such as the Coway Airmega 400S are becoming a lot more popular, and with a room coverage of up to 1560 Sq ft, it could easily be the best air purifier for anyone that’s got a large room. Could it also double up as the best smart air purifier? Well, it does have some smart features of its own, but not enough to feature at the top of that list. If you’re still curious, get to the end of this review to see what else it’s got in store.

Why We Like It – Airmega 400s

The Airmega 400S is a powerful air purifier that will very well work in large rooms of more than 1000 square feet, and thanks to its support for WiFi connectivity, it allows for remote operation through your smartphone.

  • WiFi connectivity for smartphone app control
  • Impressive 5 Year Warranty
  • Has got an Energy Star Certification
  • Expensive


The Airmega smart air purifier relies on a 3 stage filtration system to clean your air, where it uses a pre filter to trap any large air particles, a True HEPA filter that deals with allergens that are up to 0.3 microns in size, and a carbon filter that eliminates bad odours from the air. It’s filtration system may not be as elaborate as that of the Rabbit Air Minusa2 Air Purifier, but it’s HEPA air filter set makes it pretty much efficient as it is able to clean the air for up to two times an hour. Also worth mentioning is that the unit features 5 different fan speed options, giving you a range of choice for how you’d want it to operate.


To facilitate up to 2 air changes per hour in a large room of over 1000 Sq ft, the Airmega 400S will only need about 64 watts of electricity. Such a low level of power consumption is the reason why it’s got an energy star certification, and this makes it a more economical option compared to the Bissell Air Purifier. To save even more money in electricity costs, you could opt to have the unit run in smart mode, where it’ll use its air quality sensor to determine the best settings, or run it in sleep mode, where it’ll operate at its quietest.


You will be able to connect to and operate the Airmega 400S through a mobile app thanks to its support for WiFi connectivity, and this ability adds a couple of advantages to it that you will not get to enjoy if you were to opt for the Coway Airmega 300. Some of these advantages include getting a reading of the real time air quality wherever you’ve placed the purifier, and also knowing when it’s time to replace its Max2 filter set.


Like most Airmega air purifiers, the 400S is backed by a generous 5 year limited warranty, so you should have no reason whatsoever to doubt its ability to function well & ensure that you enjoy clean air over the long haul. The unit also boasts of good build quality, top notch HEPA filters, and features a sleek control panel that’s pretty easy to get around.


Thanks to support for WiFi connectivity, you’ll easily be able to integrate the 400S into your smart home setup, and be able to use Alexa for example during voice control. Even if you don’t go ahead and connect it to your phone, you’ll still be able to know when it’s time to replace the Max 2 filters since the unit has got a filter indicator on its control panel.

Airmega 400s Wrap Up

Going by the many customer reviews that have been left by satisfied customers on its Amazon page, the app enabled Airmega 400S is pretty much a great option for anyone that’s looking to enjoy seamless operation, from a unit that’s built to last.

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Kenn Muguna

Kenn is a writer that's fascinated by all things tech. Having been born curious about how everything works, he spends his time taking things apart to put them back together, and shares what he finds out through writing.

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