Coway - Airmega 400
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Reddit Reviews:
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Based on 1 year's data from Jan 28, 2026 How it works
Liked most:
136
16
"its night mode is whisper quiet"
"how quiet it is. ... it's remained silent at night after a couple of years."
"Silent"
116
13
"I've been using it for over a year now, works great with no issues."
"I've had mine since it came out!! And it keeps going even with same battery it came with but I take care of it / them maintenance wise.."
"I currently use a very old Roomba i8+, and honestly, it still does a solid job... ... Same. I have no complaints with it and I take very good care of it maintenance wise."
359
17
"I recently found out I have a bunch of allergies- including my dog, so I got these Winix units to try and help combat the allergies. ... Within about 45 minutes of running one in my living room, part of my nose that has been clogged for as long as I can remember opened up. I’m breathing better than I have in years."
"I can tell you they really work. I have a mold allergy, and mold is literally everywhere in outdoor or indoor air with spores just waiting to land in a suitable environment for growth, but I have no symptoms at home with my two small Winix."
"They are also great to have during annual west coast wild fire smoke season and keep particulates in the house undetectable even when it has been horrid outside."
166
21
"I recently found out I have a bunch of allergies- including my dog, so I got these Winix units to try and help combat the allergies. ... Within about 45 minutes of running one in my living room, part of my nose that has been clogged for as long as I can remember opened up. I’m breathing better than I have in years."
"I can tell you they really work. I have a mold allergy, and mold is literally everywhere in outdoor or indoor air with spores just waiting to land in a suitable environment for growth, but I have no symptoms at home with my two small Winix."
"They do a good job of removing smoke from the room."
23
2
"Last year there were wildfires nearby and the airmega kicked itself into high gear (I keep it on auto), so I do really trust that it’s actually doing something."
"The sensors are amazing. ... Yes whenever I cook or smoke they instantly kick on and work really well."
"the air monitoring report and air quality sensor. I've had a home improvement project going and as soon as dust started flying the air filter on auto setting cranked all the way to the max to counter."
Disliked most:
32
32
"the medify one sounds horrible- it has a weird high pitch and i can’t stand it even on the very lowest setting. ... i actually sent it back and they replaced it and the second one sounds the same."
"The Germ Guardian air purifiers from Costco are incredibly noisy and create a constant high-pitched noise at *any* setting."
"Levoit Core 300 was decent on specs, but it hummed just enough to wake the youngest every other night."
30
42
"The air purifier is now unusable since I can’t replace the filter."
"the filters are expensive as shit"
"the filters are expensive as shit"
6
18
"All of the conventional options recommended won’t cut it if you’re being serious. ... I have a few coway airmegas and blueairs and they don’t do much for real VOCs/smoke. ... My airmega has like 1lb of carbon, I’d recommend an allerair- I’ve got two airmedic 6 pro and the difference is remarkable. I think they have 25+ lbs of carbon."
"The Coway Airmega is no match for VOCs. ... It can't even filter out the smell of weed. ... odor reduction let alone VOC reduction is not something it's capable of."
"I have ordered replacement filters from Amazon and directly from coway website and both have a digesting strong chemical smell that doesn’t go away even after running the machine for a few hours."
0
1
"after buying the Levoit I realised the sealing of a purifier's filter really is something that I didn't consider. As someone with allergies the last thing I want is for dust to slip through the side of the filter and be thrown back out at me."
6
9
"It's still not providing 4-5 air changes an hour to 3,000 square feet ... It's common for air purifier manufacturers to mislead on square footage coverage. The 3,000 square foot is likely based on one air change an hour. That won't be enough for someone wanting a purifier to help with allergies, viral load reduction, dust reduction, etc. ... The Blue Air website recommends 635 square feet for 4 air changes in an hour. ... The 635 square feet assumes the device will be ran on the highest fan speed to achieve the 4 air changes an hour. ... After doing some deeper digging I learned not to trust the advertised square footage. Even some big name publications are just trusting manufacturer claims and are not doing their own testing to verify. Members of this forum like myself try to educate people that we can't always trust the advertised square footage. ... It's unfortunate we can't always trust the advertising. I wish manufacturers would give a straightforward number on air changes you can expect in an hour within a certain square footage and ceiling height. For ex: 4 air changes an hour in 500 square feet 1 air change an hour in 2,000 square feet"
"Energy Star rates the Coway Airmega 100 for 169 square feet. ... Sadly it's very common for air purifier companies to overinflate their room size coverage. ... Energy Star and the Association of Home Appliance Manufacturers are great sources for seeing the recommended room size. Even then, the room size is based on the highest fan speed. Sometimes there can be big differences among the different fan speeds."
"However, it claims to have 3500 sq foot of range but it doesn’t have the best range as I disconnect once I get to my front door. The router is upstairs with nothing directly blocking it."
5avio_ 1.0Hi, I've 4 coway air purifiers at home (2 bkh). 3 cats furry cats, fabric sofas and couple of large carpets. I'm extremely sensitive with dust and I can feel it in my nose and throat even if it's very little dusty. After getting these coway air purifiers I feel sooo much better. I've used Dysons, Mi, blueair. Out of all of them I love the coways. I have a [Coway Airmega 400](https://uae.sharafdg.com/product/coway-airmega-400-air-purifier-ap-2015f/?cpn=21923874463&pl=&kw=&adg=173662259467&ch=g&utm_source=google&utm_medium=cpc&utm_campaign=LS_SharafDG_Std_Shopping_Bilal_18112024&utm_term=&device=m&utm_matchtype=&utm_network=g&utm_placement=&utm_content=721914495737&utm_Adposition=&utm_location=9198260&utm_Sitelink=}&utm_Audience=pla-2455809539967&utm_campaignid=21923874463&utm_adgroupid=173662259467&gad_source=1&gclid=Cj0KCQjwkN--BhDkARIsAD_mnIr3GqdSYguutizgQurZxifbzxMiU0evhunlX8jR6u0HUgUsoYxvx3MaAvuyEALw_wcB) next to my bed. 2099 AED. I have two [this coway ](https://amzn.eu/d/eT6O53i) in my living room next to the sofas. 999 AED. I have [this one ](https://amzn.eu/d/4pX6sKS) under my work table. The one feature I miss is WiFi connectivity/app to adjust the fan speed or check air quality. Edit: spellings. Edit 2: I use [roborok Q revo S ](https://amzn.eu/d/esM6sND) to keep the floor and carpets dust and fur free.
annihilatrixxx 1.0Yup, we splurged on a couple coway airmega 400 purifiers when we were living in Seattle and are glad we brought them with us to Minneapolis since we bought an older craftsman home without a duct AC system (which typically allow air filters). This past week would have been really rough for my asthma without air purifiers running!
ArchaicArchetype 1.0Coway airmega 400 has been great for sure.
Bitter-insides 1.0Just wanted to say your comments are so educational! I wish I had found this sub before purchasing my air purifiers but I did end up getting the Coway airmega 400 for my living room, coway 160 for my sons bedroom and have a few Costco winix in the other rooms. The coway sees to pick up much more dust and smells than the Winix. Currently have construction going on in our home and the coway have really picked up so much.
coltonscolton 1.0Its a little pricey, but we just bought a coway airmega 400 (non smart) and its a best of a unit. I have it set to auto so it can turn off or move a lot of air when ut feels like it needs to. I cant speak about there smart version or integrations tho.
Deep_Dub 1.0The air Fanta is a corsi rosenthal box. You can make those yourself. I have the coway 400 and it’s welllllll worth the money.
demoorigin 1.0Coway is regarded pretty highly I just bought an airmega 400 but something like the airmega 1512 has been a top performer in its class and it's on a sale RN for 165.
Devmancer 1.0Hey! I’ve been using the Coway Airmega 400 for a year, it's totally worth it. Dust and allergy symptoms dropped fast, and the air feels fresher. I also recommend to look for HEPA filters, CADR rating, and quiet mode. Avoid those gimmicky ionizers, in my experience they don’t do much.
Gemmer12 1.0I ended up getting a coway airmega 400 for about a 500sq ft area with 8ft ceilings since it had one of the largest cfm and was 400$ post tax compared to the medify at 600ish, we’ll see if dust continues to build up
georgee779 1.0I have a 2 Coway 400s. One is the dining room, and one where I sleep. I’m more than positive there is mold inside my bathroom walls. Due to family “issues” the mold in the walls is not being remedied. Are you saying that the Coways can be helping what I am breathing in? I’m in a 1300 sq ft home. Dry climate, SoCal.
On a 400? I only ask because it seems my 400 filters get dirty very fast. I keep the pre filter clean.
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