The Ultimate Guide to Airmega Air Purifiers Review

The Ultimate Guide to Airmega Air Purifiers Review

The compiled list of Airmega air review, Airmega purifier or nowadays Coway Airmega is a new generation smart air purifier that comes with all the bells and whistles available in the air filtration world. In this Airmega review guide, we will be looking into the compatibility of Wi-Fi pairing with Amazon Alexa, accuracy of its light and pollution sensor, what ground (room size) it will cover, airflow delivery rate, filtration depth of Max2 Filter and finally Airmega competitiveness in pricing and maintenance. Each Airmega air purifier listed here also comes with our final verdict, pros and cons plus full specification that you can compare with. The ultimate stop of all Airmega review that you should read before purchasing one.

About Airmega Review

A new type of air purifier for a new generation, Airmega used to be a standalone brand from Coway and now its back under the brand again known as Coway Airmega. Most people will know Coway as a pure water leader with millions of water purifiers installed across the globe. With around 220 researchers and over 4,300 intellectual properties, the R&D division is focused on developing sustainable technologies related to healthy water and air. Airmega under Coway will continue to prosper through continuous innovation, research and development.

Source: Coway official website

Getting to know Airmega

Dimension, Weight and features There are only 2 sizes for Coway Airmega air purifiers: the smaller 13.6 x 21.2 x 13.6 in found in 300 series and the slightly larger 14.8 x 22.8 x 14.8 in found in 400 series. Weight is of course lighter for the 300 series at 21.4 lb while 400 series weight stand at 24.7 lb. Regardless of the dimension, all Airmega reviewed here shares the same modern design with 4 legs, side handles, top controls and seamlessly integrated colored LED ring that shows air quality status. At the point of this writing, only 2 color options are available: white and black (limited to 400 series). Other standard features found in all Airmega air purifiers include a 4 speed with Auto, Eco and Sleep mode, timer, pollution sensor and filter life time indicator. Airmega 400 series gets additional light sensor plus Auto Sleep mode and real-time filter usage indicator that reminds you when to change or wash the filters. Wi-Fi and app support are only available in S models i.e. Airmega 300S and 400S.
Warranty and after-service support Beside the standard live chat enquiries, after-service support via phone or email, there is also 30 days money back guarantee and free shipping through their official website. All Coway Airmega air purifiers comes with standard 5-Year Manufacturer Limited Warranty that covers motor and electronic parts from manufacturing defects starting from the date of its original retail purchase.

Filters and Technologies

Filters and Annual filter replacement cost Coway Airmega air purifiers utilize the same 4-stage filtration setup. With 2 pre-filters on both side of air inlet, the main filtration consists of an activated carbon filter and Green True HEPA filter. The 2 permanent pre-filter is reusable while the carbon and HEPA filter requires yearly replacing through a bundled Max2 filter set. The combined filter set has an estimated replacement cost of $100 for Airmega 300 series while $130 replacement cost for the higher Airmega 400 series.

Overall airflow performance

Purifying coverage, Airflow, Fanspeed and CADR Standard 4 speed with Auto/ Eco / Sleep mode across all models, Coway Airmega air purifiers has a very high-performance benchmark. Purifying coverage is range from 628 sq. ft. (4 air charges) up to 1,256 sq. ft. (2 air charges) for 300 series models, while 400 series models has a higher 780 sq. ft. (4 air charges) up to 1,560 sq. ft. (2 air charges). Clean air delivery rate (CADR) is equally impressive, with overall dust, pollen, smoke at 260 cfm for 300 series and 350 cfm for 300 series.
Noise level and Power consumptionAll Coway Airmega reviewed have a good track record in noise and energy management. There is the option to toggle between the 4 speed or trio mode, Airmega purifier also generated reasonably low noise level between 22 – 52 dB. Even at high fan speed the noise level output still fall below the 60 dB guideline. Being an Energy Star certified models, power consumption is also on the lower side as Airmega 300/ 300S consume an average 57 watts while Airmega 400/ 400S is only slightly higher at 66 watts.

Which Airmega air purifier to go for?

The starter air purifier that’s nothing of a starter, Airmega 300 has the airflow performance and purifying coverage that would put other brand “premium” model to shame. The maximum 1256 sq. ft. can cover a lot of grounds including a full-size living hall. 260 cfm clean air delivery rate is also equally where no household allergens, bacteria, chemical, smoke and odor would be too difficult for Airmega 300. 3 pre-set timer via the control panel and 5 years warranty also comes standard. Perhaps the best feature for some, Airmega 300 is almost indistinguishable from its Wi-Fi enabled version and the higher range 400 series. The modernize casing is as practical as it is pleasant to look at with dual suction inlet, well-integrated air quality indicator and easy to use control.

Of course Airmega 300 is not really a “starter” air purifier given its well-equipped features, outstanding airflow delivery rate and premium price tag. It also misses out on Sleep mode feature that automatically adjust the fan speed to low when there is no light source and the Wi-Fi connectivity available in 300S.
  • Very wide purifying coverage despite being the least expensive in its series.
  • Dual pre-filter that traps large particles coming from both sides. Also protect and extent the inner filter lifespan.
  • Excellent allergens and smoke filtration via its Green True HEPA/ Carbon filter.
  • Auto mode that is sensitive to surrounding air quality.
  • Separate Pre-filter and MAX2 filter lifetime indicator.
  • Built-in timer without having to rely on the app.
  • Clear and accurate real-time air quality display indicator.
  • Acceptable annual Max2 filter replacement cost for its higher-end category.
  • 5 years official warranty from Coway.
  • Still expensive despite being the cheapest model in the group.
  • After online discounted price, you only need to top up a little bit more for the Wi-Fi version (300S).
  • Lacks auto sleep mode and real-time filter replacement indicator found in 400/ 400S models.
  • No Ionizer as an additional filtration option.
± 649 p
     Annual filter ^    
± 100 p
Online price*
Latest Amazon price

If you fancy Airmega 300 yet do not want to give up on the Wi-Fi feature, you’re in luck as Airmega 300S is exactly that. Essentially the same model as Airmega 300 with added Wi-Fi feature, Airmega 300 allows remote access to the air purifier through android or apple phone. Inside Airmega’s smartphone app, you can control the air purifier speed, change different purifying mode, access real-time air quality report and setup timer or scheduler (exclusive to IoCare app). Airmega 300S also pair well with Amazon Alexa to perform simple commands including turning on or off the air purifier, switching to Smart/ Sleep mode, fan speed change, setup timer, get air quality report and check filter life status.

If you do not fancy the price tag of Airmega 300, Airmega 300S is even costlier although only by a smaller margin. There is a learning curve on the app but you should be able to get the hang of it within couple of hours. Lastly the lack of autonomous sleep mode and real-time HEPA and carbon filter usage monitoring might be the last straw of choosing over the 400 series.
  • 4-stage filtration with wide purifying applicable area (at 2 air charges).
  • Use 2 Pre-filter on each side of the air purifier to traps dust and pet hair.
  • Highly-efficient allergen, smoke and odor filtration with the combined Max2 filter.
  • Convenience and highly practical Smart mode (Auto mode/ Sleep mode).
  • Separate Pre-filter and MAX2 filter lifespan indicator.
  • Remotely access the air purifier functions via IoCare app.
  • Real-time air quality display indicator.
  • Adjustable sensor's sensitivity level (sensitive, normal, less sensitive).
  • Reasonable Max2 filter replacement cost that only requires one yearly change.
  • Standard 5 years warranty.
  • Expensive based price that is close to the non-Wi-Fi 400 version.
  • Little learning curve on setting up Wi-Fi connectivity for first time user.
  • No built-in timer. Only accessible via Airmega app.
  • Lacks autonomous sleep mode activation (available in 400/ 400S).
  • Lacks real-time HEPA and Carbon filter change indicator (available in 400/ 400S).
  • No Ionizer within its filtration list.
± 749 p
     Annual filter ^    
± 100 p
Online price*
Latest Amazon price

If the power of Airmega 300 series still does not satisfy you, perhaps Airmega 400 can be the ultimate answer. At quick glance it might have the identical offering as 300 series from the modern exterior to the filtration setup, on closer look you will see there is more unique features that is only available here. Firstly, there is a full black version that you can choose, 2 real-time filter lifespan update and indicator for HEPA and carbon filter, automatic Sleep mode activation when light is cut off and finally, Airmega 400 has a wider 1560 sq. ft. purifying coverage along with the bump up 350 cfm CADR for dust, pollen and smoke.

There is a price for all the nifty stuffs other than the actual price. For starter Airmega 400 is heavier and bigger than Airmega 300/ 300S. It also consumes more power (understandably so) with no extra filtration advantage such as an Ionizer or UV-light. Needless to say, if you want the Wi-Fi version, you have to top up even more.
  • 4-stage filtration with very wide purifying coverage.
  • Dual pre-filter that traps large particles from both sides of the air inlet.
  • Max2 filter (Green True HEPA + Activated Carbon) is great against smoke and micron size pollutants
  • Auto mode with adjustable sensitivity for more accurate detection.
  • Sleep mode that automatically adjusts the light and speed when there is no light source.
  • Pre-filter and MAX2 filter lifespan indicator is based on real-time usage and environment.
  • Clear and accurate air quality display indicator.
  • 5 years Airmega official warranty.
  • Cheaper than 400S model but still relatively expensive.
  • Expensive filter replacement cost despite only one annual filter change (Max2 filter).
  • No remote access (via app) as 400 have to do without Wi-Fi connectivity support.
  • Lacks optional Ionizer feature even though not everyone would utilize it.
± 749 p
     Annual filter ^    
± 130 p
Online price*
Latest Amazon price

You want power and the latest technologies, Airmega 400S will cover all that and more. It has up to 1560 sq.ft. coverage, a whopping 350 cfm of clean air delivery rate (CADR), 4 speed with Auto/ Eco mode, dual suction inlet with 2 permanent pre-filter, carbon filter and Green True HEPA filter. It also has the unique 400 series feature like auto Sleep mode via light sensor and real-time filter usage indicator for Carbon and HEPA filter. Basically a mirror to Airmega 400 with added Wi-Fi support. Using Airmega's IoCare app that is downloadable via iTunes or Google Play, you can use your smartphone as a remote control to access your air purifier functions plus features that is only available in the app such as scheduler, air quality update with history report and voice command via Amazon Alexa.

Other than the almost inaccessible pricing, the lack of an ionizer or UV-light filtration might be the one thing that makes Airmega 400S incomplete. Not a deal breaker but something that could be there given its price tag. Like all the recommendation we had given in Airmega air purifier review, go with the smaller 300 series model if you do not need the extra airflow juice as there is little differences between them.
  • 4-stage filtration with widest purifying coverage in its group.
  • Dual pre-filter that cover and protect the HEPA filter from large particles like dust.
  • Outstanding allergens and smoke filtration via MAX2 filter (Full-size HEPA + Carbon).
  • Auto mode that accurately adjusts the fan speed based on room air quality.
  • Light/ sleep mode that automatically tones down the noise and speed when the room is dark.
  • Separate Pre-filter and MAX2 lifespan indicator that based on real-time usage.
  • Timer + advanced scheduler for 7 days customizable on and off setting (via IoCare app).
  • Highly legible and accurate real-time air quality monitor.
  • Standard 5 years manufacturer warranty.
  • All Airmega air purifiers are expensive. This is the most expensive version of its series.
  • Filter replacement cost is high although Max2 set consists of both HEPA and Carbon filter.
  • Slight learning curve on Wi-Fi connectivity especially for first time user.
  • No Ionizer as an option.
  • Timer is only accessible via Airmega app.
± 849 p
     Annual filter ^    
± 130 p
Online price*
Latest Amazon price

Complete list of Airmega air purifier reviewed

In no particular order, here is our most recent list of Airmega reviews: Airmega 400,  Airmega 300,  Airmega 400S,  Airmega 300S,  click on the link below to learn more.

Explore all Airmega models

Frequently Asked Questions (FAQ)FAQ

There is an odor coming from my brand new Airmega air purifier.

It’s perfectly normal if you experience plasticky or metallic smell as the odor is the combination of air purifier materials packed in a box. In typical fashion, the smell would probably last for few days. You can speed things up by switching Airmega to maximum speed.

Does Airmega air purifier cool or warm the air?

There is no cooling or heating effect on the purified air released from Airmega.

Can I leave Airmega air purifier on all the time?

Yes you can as Airmega air purifiers is designed to run continuously without fail. If you have concern about the energy consumption, There is Eco and Auto mode where the air purifier will rely on its built-in sensor to decide what is the best speed needed for optimum performance. Airmega 400/ 400S comes with Auto Sleep mode that will automatically set the air purifier speed to low when there is no light source.

Will Airmega air purifier work as humidifier or dehumidifier?

No there is no humidifier or dehumidifier function in Airmega air purifier.

How many speed does Airmega air purifier has?

All Airmega air purifiers comes with standard 4 fan speed plus Auto, Eco and Sleep mode.

Does Airmega produce ozone?

Absolutely no. Airmega air purifier only uses mechanical filters for its filtration without relying on Ionizer, UV-light or similar technologies.

What is the smallest microorganism Airmega air purifier can capture?

Airmega air purifier with Green True HEPA filter can capture as small as 0.3 microns of microorganisms at 99.97% efficiency rate.

Where is the best location for Airmega air purifier?

Literally anywhere in home as all Airmega purifiers has a wide purifying coverage with decent noise level. Mostly people would place in in their living hall or bedroom where they will likely spend the most time in. As a reminder, leave some space between the wall to ensure no airflow disruption and do not place it next to home appliances like TV, microwave as the electromagnetic interference would damage the air purifier.

How noisy is Airmega air purifier?

Decent with speed 1 at an average of 22 dBA all the way to 52 dB at max speed.

Is Airmega 120V? Can I use s U.S. spec Airmega in other country?

Using Airmega in other country would effectively void the manufacture warranty thus not recommended to do so. In theory, a step-up or down transformer would be able to power Airmega with different power requirement, in reality there are far too many cases where the air purifier is damaged by irregular voltage and AC frequency.

How often do I need to replace the Max2 filter in Airmega?

Airmega bundled Max2 filter (activated carbon filter and Green True HEPA filter) has a suggested lifespan of 1 year. Most people can probably stretch the filter lifespan to approximately 2 years on healthy environment and low usage (around 10 hours per day). As Max2 replacement filter comes in a set, we recommend replacing both at the same time if either of the filters is exhausted.

How do I replace the filter in Airmega air purifier?

Firstly, turn off and unplug the air purifier before proceeding. Remove both sides of the front cover by pressing on the 2 top tabs. Discard the old Max2 filter, remove the plastic wrap from the new Max2 filter, slot in the new Max2 filter first, follow by the pre-filter. Return both sides of the cover by securing the bottom clip first and test by turning on the air purifier.

Can I connect my Airmega air purifier to multiple smartphones?

Yes you can and it’s not limited to android or apple smartphones only. Download the IoCare app through iTunes or Google Play and sign in with the same credentials.

I have more than one Airmega installed at home. Can I connect to multiple products?

Yes you can. Simply add the products in the application.

What happen if I change my router? Do I need to redo the Airmega pairing again?

That depends if you are using the same SSID and/ or password for the new router. No changes needed if everything remains the same, otherwise please delete the current air purifier from your application and redo the pairing steps to relink the air purifier again.

Why I can’t connect my Airmega with my phone after following all the steps?

Please check whether your Wi-Fi router support 2.4GHz band (through SSID network or on the router label itself). There are two common frequency bands used in Wi-Fi communication: 2.4GHz and 5GHz. Most modern routers support both bands and can be set to broadcast 2 different networks or set to broadcast only one band. Airmega can only connect to 2.4GHz band so if you have a router that only supports 5 GHz band, you’re out of luck.

My Wi-Fi network doesn’t show up at all.

There are few common reasons that would to Wi-Fi no show. No internet connection, Wi-Fi disruption, Wi-Fi name is hidden or pushed down from the list. Restarting your router is the first thing to do that should resolve most issues including internet connectivity issue. If the Wi-Fi network still doesn’t show up, try hard reboot by unplugging the router, wait for at least 10 seconds before plugging back the router and restart again until you see steady power and connection indicator lights on the router. Reduce the number of connections to the router would help as well. If all fails, try moving Airmega closer to router or move away any metal/ home appliances object that could be interfering with the Wi-Fi connection.

Why can’t I scan the product barcode?

First thing first, make sure there is barcode scanner app install on your phone. Second make sure the barcode scanner app has permission to use the camera mode in your iOS and android. Third try to find an open space with enough light source for the camera to capture. Also move the camera further back if you have issue focusing on the camera. If all fails, manually input the serial number to the application.

Help! I forget my Wi-Fi router password.

Hard reset your Wi-Fi router. There is nothing on Airmega side can do.

Where can I find the troubleshooting guide for the Airmega air purifier?

You can find the troubleshooting guide on the owner’s manual and product page itself at or Airmega official website.

Why is my Airmega Wi-Fi connection cut off frequently?

If your Airmega Wi-Fi cut off frequently, there could be Wi-Fi interference that cause the poor Wi-Fi connection. Try moving the air purifier closer to the router/ modem or reduce the number of connected appliances on the Wi-Fi network.

Why isn’t my city appearing in the Outdoor Air Quality index?

The app does not offer Outdoor Air Quality index in every city of the United States. The best action is to choose the location closest to your city.

How to change Airmega to a new time zone?

Please go to Settings and select Time Zone. Click on the Location button to find your new location and click on the Save button.

I did not receive any filter change/clean notifications update on my app even though the indicator light is showing on Airmega?

Please check if the notification setting is off on you iOS or Android. To receive future notification, please turn on the feature.

Wi-Fi indicator light occasionally blink. What does it mean?

If the Wi-Fi LED light is blinking: No connection has been made or pairing is the progress. If is constant LED: Wi-Fi is connected. If there is no LED light: Wi-Fi is off.

Why there is no beeping sound when I press the Wi-Fi icon and Light icon together for the pairing?

Please check if Airmega is turn on. If there is no indicator lights illuminated, check the power source or switch to another electrical outlet.

Airmega isn’t responding to command from the app/ Remote control function not working.

Check if Airmega is powered on and Wi-Fi LED light is on. If Wi-Fi LED light is blinking, there could be internet connection issue or Airmega is not connected to the Wi-Fi network. Reduce the number of devices connected to the Wi-Fi network and see if it helps. Or else try restarting the router/ modem or move Airmega closer to the router.

There is delay on command sent from the mobile app to the air purifier.

Reduce the number of connection to the Wi-Fi network or place Airmega closer to the router.

Why is the Indoor Air Quality indicator on my Airmega different from what the app is showing?

Check if Airmega Wi-Fi LED light is on. Reduce the number of devices connected to the Wi-Fi network.

App does not show any changes on the filter lifetime level monitoring/ graph is showing flat.

Make sure Airmega Wi-Fi LED light is not off or blinking. Reduce the number of devices connected to the same Wi-Fi network.

Airmega doesn’t react according to the timer or scheduler settings in the app.

Most likely scenario is the incorrect time zone on the app or timer/ scheduler has been changed by another user. Also please note that timer will always reset every time you turn off Airmega.

Ultimate Airmega Comparison Table

Air PurifierFiltrationCoverageScoreOnline Price
Airmega 3004-stage1256 sq. ft. (117 m2)9
Airmega 300S4-stage1256 sq. ft. (117 m2)9.1
Airmega 4004-stage1560 sq. ft. (145 m2)8.8
Airmega 400S4-stage1560 sq. ft. (145 m2)9


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