This unit seems very accurate. Every time my wife cooks, it kicks into high speed from the smoke. I'm not joking, it actually does. Even if it's just a strong smell from the cooking, it goes into high speed. I even heard it kick in one time after I sneezed. I've already cleaned the outer filter 3 times since purchasing it (about a month now), so it's collecting. And we no longer see the dust floating around when the sunlight shines through the windows in the morning. It's made a big difference.
On the cons side, I see no reason for this thing to make a sound when it changes mode. When I configured the auto mode change at night and in the morning, it make a bing-bing sound 3 times in a row about 10 seconds between. It's in our living room, so no big deal, but if you plan to sleep nearby, it would be annoying.
Another con, the app is not that great. I had to disable it sending alerts, because the only alert it sends is that your air quality is extremely bad. And it did it so often that I finally disabled it. But then when I opened the app, and viewed the air quality readings, it was never in the extremely bad range, or only hit it once or twice, much less than the numerous notifications.
I would recommend going with the non-app version which is significantly cheaper. You won't use the app, unless you forgot to set the mode of the unit before leaving on vacation, but even then, what's the worst that will happen? If no one is in your home, it's unlikely there will be any dust being stirred up anyway, and it will just keep running in the previous mode. The app does show air quality in a graph form, but looking at that wore off after the first couple of days.
The build quality is really nice. Heavy strong plastic sidewalls, easy and intuitive filter replacement, and it's very quiet for the amount of air it appears to be moving. Overall, I'm very satisfied with the quality!
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This item: Coway Airmega 400S App-Enabled Smart Air Purifier (Covers 1,560 sq. ft.), True HEPA Air Purifier with Smart Technology, Compatible with Amazon Alexa and Google Home, White (111012)
$749.00
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From the brand
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Our obsession with helping people live happier, healthier lives began in 1989.
Coway has become a global leader in intensive research, engineering and innovation, amassing over 5,000 intellectual property rights in all. We believe every element needs to be examined, researched, understood, tested and retested. We obsess over every detail, so Coway products can help transform your space into health sanctuary.
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From the manufacturer
Coway Airmega Premium Line-up
 Airmega 400S |  Airmega 400 |  Airmega 300S |  Airmega 300 |  Airmega 250S |  Airmega IconS |  Airmega ProX | |
|---|---|---|---|---|---|---|---|
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Customer Reviews
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6,349
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6,349
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6,349
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6,349
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1,031
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Price
| $749.00 | $429.45 | $399.99 | $362.25 | $349.02 | $567.21 | $711.90 |
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Coverage
| 1,560 sq. ft. | 1,560 sq. ft. | 1,256 sq. ft. | 1,256 sq. ft. | 930 sq. ft. | 649 sq. ft. | 2,126 sq. ft. |
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App & Alexa & DRS
| ✔ | ✘ | ✔ | ✘ | ✔ | ✔ | ✘ |
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Auto Mode
| ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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Eco Mode
| ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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Sleep Mode
| Automatic | Automatic | Manual | Manual | Automatic | Automatic | Automatic |
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Rapid Mode
| ✘ | ✘ | ✘ | ✘ | ✔ | ✘ | ✔ |
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Filters Configuration
| Pre-Filter+ Carbon + True HEPA | Pre-Filter+ Carbon + True HEPA | Pre-Filter+ Carbon + True HEPA | Pre-Filter+ Carbon + True HEPA | Pre-Filter+ Carbon + True HEPA | Pre-Filter+ Carbon + True HEPA | Pre-Filter+ Carbon + True HEPA |
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Pollution Indicator
| ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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Filter Life Time Indicator
| ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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Manual Fan Speed
| Low, Medium, High | Low, Medium, High | Low, Medium, High | Low, Medium, High | Low, Medium, High | Low, Medium, High | Low, Medium, High |
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Timer & Scheduler
| Timer 1, 2, 4, 8 Hr, Scheduler | Timer 1, 4, 8 Hr | Timer 1, 2, 4, 8 Hr, Scheduler | Timer 1, 4, 8 Hr | Timer 1, 2, 4, 8 Hr, Scheduler | Timer 1, 2, 4, 8 Hr, Scheduler | N/A |
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Available Colors
| White/Graphite | White/Graphite | White | White | Beige | Beige | Mocha Beige |
Compare with similar items
This Item  Coway Airmega 400S App-Enabled Smart Air Purifier (Covers 1,560 sq. ft.), True HEPA Air Purifier with Smart Technology, Compatible with Amazon Alexa and Google Home, White (111012) | Recommendations  |  |  |  |  | |
| Price | $749.00 | $269.99 | $279.95 | -12% $485.10 Typical: $549.99 | -6% $379.55 Typical: $405.60 | -15% $399.99 Typical: $469.99 |
| Delivery | Get it as soon as Thursday, Apr 10 | Get it as soon as Thursday, Apr 10 | Get it as soon as Thursday, Apr 10 | Get it as soon as Thursday, Apr 10 | Get it as soon as Thursday, Apr 10 | Get it as soon as Thursday, Apr 10 |
| Customer Ratings | ||||||
| Sold By | Amazon.com | Amazon.com | Smarter HEPA | Amazon.com | Amazon.com | Amazon.com |
| filter type | True HEPA, Active Carbon Filter, Pre-Filter | True HEPA, Active Carbon Filter, Pre-Filter | HEPA, Activated Carbon | True HEPA, Active Carbon Filter, Pre-Filter | True HEPA, Active Carbon Filter, Pre-Filter | True HEPA, Active Carbon Filter, Pre-Filter |
| floor area | 1560 square feet | 975 square feet | — | 649 square feet | 881 square feet | 1256 square feet |
| control method | voice | touch | touch | touch | touch | voice, touch |
| power source | Corded Electric | Corded Electric | ac | Corded Electric | Corded Electric | Corded Electric |
| particle retention size | 0.01 micrometer | 0.01 micron | 0.07 micron | 0.01 micron | 0.01 micron | 1256 square feet |
| noise level | 22 decibels | 20.6 decibels | 52 decibels | 21.7 decibels | 22 decibels | 22 decibels |
| specification met | Energy Star Certified | Energy Star Certified, CARB Certified, ETL Certified | AHAM Certified, CARB Certified, Energy Star Certified, UL Certified | CARB Certified, ETL Certified | Energy Star Certified, CARB Certified, ETL Certified | Energy Star Certified, CARB Certified, ETL Certified |
| weight | 24.7 pounds | 20.5 pounds | 15.5 pounds | 19.2 pounds | 20.5 pounds | 21.4 pounds |
Amazing Air Purifier! Software needs guidance (READ ME)
First off this filter is very large and the filters within it are huge in comparison to other competitors (Detailing Honeywell AirGenius 4 / 5 , Honeywell HEPA HPA300, and Molekule below). Check out the overall measurements of the unit before ordering it - 15" by 15" by 23" tall.First off, this purifier is BIG, and has TWO LARGE HEPA / Charcoal filters on each side. The HEPA will remove 99%+ of air contaminates and the Charcoal will scrub any smell. Do you have dogs or live in an area with bad air quality? Get this! The only downside is that the filters need to be replaced once a year and typically around $120 for the full set, you dispose the old ones. But when it comes to health . . . just do it. I had "Cleanable" filters in the past such as the Honeywell AirGenius 4 & 5 , let me say when you have to do it 4 times a year, I rather just pay $120 for the set. It typically takes 45 minutes each time to clean the AirGenius and about 4-5 hours to dry.The Coway Airmega 400s purifier also has a fine mesh pre-filter on each side of the unit (before the main HEPA / Charcoal). It is VERY fine, and is meant to capture hair and other items (heavy dust). These do not need to be replaced, instead they are cleaned manually, some say just clean them with water using a garden hose . I would be very careful using a hose since the fine mesh could tear. Instead I would recommend wiping them down by hand with a paper towel to remove the fine debris then fill up a bath tub and swirl them around a few times, then let them pat them dry with a towel and let them air dry.I first had the Honeywell AirGenius 4's and 5's for a few years but decided to move away from them because of health concerns related to the ozone producing electrostatic filter. I've heard of respiratory problems and other issues arising from the ozone they produce, even the EPA recently released some documentation on electrostatic filters, so I decided to move to a Honeywell HEPA equivalent.Next I moved to the Honeywell True Clean HEPA HPA300 ($250 each), this unit is also very big with 3 HEPA filters (much smaller filters than the Conway but it has 3 of them instead of 2, and a large replaceable charcoal filter in front of the HEPAs. Although a great unit, I wanted more coverage instead of buying more of these. Consumer reports rates this their top 3 filters on the market, if you have a smaller apartment / condo and want to save some money, this one is great and the replacement filters are half the price (but a little less than 60% of the coverage at around 465 square feet - i'll explain soon why the Coway Airmega 400s should only only be rated at 780 square feet).Lastly I moved the Molekule setup ($800 each) , although a very attractive unit the pre-filter is TINY and got clogged all the time. The pre-filters on this thing vs. the Molekule are maybe 6 times the surface area and there is TWO pre-filters in here, so around 12 times the pre-filter surface area. The HEPA filter in the Molekule feels like a toy compared to the giant ones in this unit. The only advantage the Molekule has is that it contains a light killing coating on the filter activated by a UV light within the unit. If Coway added a UV filter post stage they will own this market.In regards to color unit in all the pictures i've seen show it black, this is not true, its a very attractive gray on all side, and black on the top and feet.The power of this unit is amazing, if you turn it up all the way IT IS LOUD, but at the lowest setting I don't really notice the unit, other items in my room make more noise. There is a big leap in power output and sound from level 1 to level 2. Technically there is 5 settings, sleep, level 1, level 2, level 3, and smart which will just move the settings around using the smart sensor within the unit.Does it clean the air? That should be the most important question! The air smelled smelled noticeably cleaner after using this unit for a day and coming home. If I cooked something right away my house didn't smell of the food, those charcoal filters work great!How may do you need? The 1560 square feet is not accurate, that is for 2 full air scrubs per hour. Technically the rating is suppose to be 4 full square footage air scrubs an hour per the CADR (Clean Air Delivery Rate standard). Then you need to think about if you sleep with your bedroom closed at night you won't get filtered air in there, or if you put the filter in your room the rest of the house will not get airflow. So really this should be rated for 765 square feet at 4 full air scrubs per hour, which is still better than anything on the market! Even the big HoneyWell unit is rated for 465 square feet, and the Molekule is rated for ~400 square feet when you normalize it. I'm going to put some recommendations below, but if you can only afford one unit, don't worry, even 2 full air scrubs an hour is AMAZING, better then most things out there. If you keep it running 24 hours a day your house will be VERY clean.My 2 cents in an IDEAL situation (if you have the extra money to spend): In single floor house I would get one for the master bedroom and one for a common area (living room, kitchen, dining room) as far away from the bedroom as possible. This will ensure while you are sleeping you get clean air and so does the rest of the house. If you have a two floor BIG house I would recommend getting 3 units with the 3rd unit being upstairs in a common area or in a kiddo rooms. 3 units should be good for 2300 - 4680 square feet if you take the full 4 full air scrubs into consideration or Conways 2 full air scrubs an hour.The only downside is the app setup, once working it is great on Apple. On Android it is a mess, I think they ported it over from Apple to Android and didn't finalize their QA.I was NOT successful adding this unit to my 5Ghz network. It doesn't let you select your wifi from a list, instead it grabs the last wifi you were connected to. So first thing, connect your iphone to your 2.4Ghz network. Then start the setup.One important thing I documented in my pictures is where the buttons are. They aren't the big round things on the left side needed to start the wifi paring, those are just indicators. You touch the screen printed area that i'm pointing at in the pictures in order to start the wifi pairing (Follow the app instructions).The unit is turned on by the big power button, but the level is controlled by the touch arc between the power button and the screen printed area of power level.You will probably get a API request timeout in the app the first time you set it up, just force kill the app (on your iphone X swipe up to pull up the app carousel, then swipe up again to force kill the app, on iphone 4 to 8 double touch your home bar to bring up the app carousel, then swipe up again to force kill the app). On the second reload everything will work great.Other then those small hangups on setup and getting the app working for the first time, it has been great. I think the app is pretty well laid out and informative.The app will tell you when to change your filters, what your air quality looks like over the last few hours / days / week, give you the ability to turn on and off the unit by a schedule, adjust the fan levels, order new filters, etc.If you don't use the app there is a lit up circle on the front of the unit that will tell you your current air quality and notify you if you need to clean or change your filters (clean pre filters or change once a year your HEPA / Charcoals).Coway if you want to own this market and steal the market share away from dyson, honeywell, and everyone else on the market, revise your app with better QA and a better UX, it is a little rough. Add a post UV filter. Add another step between fan level 1 and fan level 2. Get this in costco, best buy, or consumer reports.I highly recommend this unit. The prices now are currently amazing so there is no reason you shouldn't get this!
Top reviews from the United States
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- Reviewed in the United States on February 10, 2019Style: 400S WHITEVerified Purchase
I love a lot about this air filter. I really like the smart features. I originally thought they would be gimmicky, but after living with it for a few weeks I have experienced the value. I love that it detects the airborne contaminants, and increases air circulation to clean the air. I’ve noticed that it increases air flow during high traffic and vacuuming, among other things. I like that I can check the app for air quality, and I can see past air quality as well. I like that the filter knows when it’s bedtime and decreases airflow, in order to keep noise pollution down, for quiet tearfulness.
Cleaner healthier air, while saving money, don’t be affraid to try the Amazon warehouse deal!!
Reviewed in the United States on February 10, 2019
Now on to effectiveness. We have a nearly 3000 square foot new construction home. It’s about three years old. Most of our air contaminants likely come from area construction, as well as a year round growing season, with year round pollen and similar contaminants. My oldest child has had a persistent hack for the last couple of years. I would not really call it a cough, so much as a hack. Every few minutes he would do a throat and lunch clearing cough. It never seemed short of breath, just seemed to be clearing an irritant. We took him to doctors, who suggested everything from allergies to asthma. We sort of ruled out asthma because he is athletic, and has no issues out working other children, and displays no unacceptable shortness of breath, other than what you expect, and recovery times are quicker than normal. As a previous asthma sufferers myself, that does not resemble asthma to me. We opted to try daily allergy medications, and they seemed to help some, but did not eliminate that dreaded hack. Now I said all of that to say this. Since we added this filter, we hardly ever hear him clear his lungs. I’m actually surprised, because I assumed it would take much longer. I figured he had been doing it long enough that it was a habit by now. But after a few days of filtering, his symptoms diminished, and after a week or so, he almost never does it.
Now our home is nearly double the size of the the filters rated coverage area. But the design of our home, I think, allows one unit to work. Our central air unit has only one air return, and it is at the blower unit. This is located centrally, upstairs, in a closet with a vented door. The area around that closet is sort of an open landing area, that opens to a large family room. I think what is happening is that the filter can clean large volumes of air, that then get circulated through the house. The dirty air is then pushed back up to that open area, and filtered by the unit. The unit can tell when air is clean or dirty, and increases, or decreases circulation, accordingly. Anecdotally this seems to be a successful test, eliminating our primary concern. The side benefit is the remainder of our family is now breathing cleaner, healthier air. It just took one sensitive member to illustrate the need. I wish I had known this would solve the problem, and I wish I had done it sooner. I expected to need to units to have a successful result, and I’m so pleased that one unit does the job. Not every home may have the same results. Some may actually need two units to do the job.
Also, I opted to shop the amazon warehouse deals and save a bunch of money. I bought a used acceptable condition unit. It arrived in a generic box, but everything was still protected by the factory foam, and cling wrap. Everything appeared new, and worked perfectly. If you want to save s big percentage, I highly suggest checking out the warehouse deals. If your displeased with the condition, Amazon has a very generous return exchange policy. My filters in my unit looked brand new and unused. But if I were concerned, new filters are about $100, so you could still have significant savings, even if you opted to put brand new filters in it right away. At first I was put off by what seemed like a high filter cost. Then I recognized what I was spending on allergy medication each month, for one child. The filters provide clean, allergy free air for the whole family, at a fraction of the cost of allergy medications for one child. By reducing our allergy medication costs, we can replace filters as needed, an no added cost.
I would have thought building a new home would prevent these issues, but the other new construction in the area, seems to exacerbate the issue.
I also weighed the option of an Aprilair, or air bear system on our central air unit, but I was concerned about the designed air flow for our system, and any disruption could shorten the central air life, increase energy needs, and decrease overall home comfort. Those air filters work great for a system designed and tuned for their use. But for a system designed for a more or less open fiber filter, it could cause problems. So I decided a stand alone filter would be the better option. Also those air handler systems that go on your ariconditioner unit, are not usually helps rated. The AIRMEGA 400s is. And it is constantly monitoring, and cleaning the air. It also uses no harmful ozone. I’m an ozone fan, and I own an ozone generator. But I like to use it in specific situations, under controlled conditions, when all occupants can be out of the house. I don’t want ozone to be a part of my primary home air filtration system. Others may have different priorities, and I encourage you to research the benifits and precautions, and choose according to your needs and priorities.
Images in this review
Top reviews from other countries
- Amazon CustomerReviewed in Canada on August 14, 2023
Works Wonderfully
Style: 300S WHITEVerified Purchase -
JuanReviewed in Mexico on April 25, 2023
Elimina olores y funciona solo.
Style: 400 GRAPHITEVerified Purchase -
Jorge PardoReviewed in Mexico on October 11, 2019
No quita olores de cigarro y emite olores a plástico quemado.
Style: 300 WHITEVerified Purchase - Don GauthierReviewed in Canada on January 6, 2022
Quality meets Quiet
Style: 400S GRAPHITEVerified Purchase
After an enormous amount of research, decided on this unit for a large open space ~1000’sq. Looks good, and feels of high build quality.Don GauthierQuality meets Quiet
Reviewed in Canada on January 6, 2022
This purifier moves a lot of air on its Max setting, and you can feel the air movement from several feet away. It blows upward, so not a breeze like from a fan, but a gentle air movement circles the room. It’s also very quiet. In low you cannot hear anything, even standing beside the purifier. Medium adds a little white noise to the room. High is noticeable, but not a nuisance.
Pros: “Smart” air purifier boasting a high CADR, attractive unit, solid build quality, decent price, and dual 12-month HEPA filters make this a smart investment. Dual handles make this easily manoeuvrable.
Cons: Filter availability.
The App: The app is decent, not great. It’s basically a remote control (on/off, fan speed) with a custom schedule builder if you don’t want the Auto mode enabled. Offers filter life indicators/notifications as well as indicators/notifications when to wash the pre-filter filters. Air Quality Index (AQI) is not available in North America.
If the 400S (“S” = Smart) is a few bucks more than the 400 (standard) then go for it… but consider how much more you are willing to spend for the ability to control fan speed and receive notifications on your phone.
Filters are not easy to find, perhaps due to the popularity of HEPA in the age of COVID, …but like face masks, hand sanitizer, and toilet paper… I’d expect that to normalize soon. All said, we’re happy. Would not hesitate to purchase again.
Images in this review
