Coway - Airmega 400
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Reddit Reviews:
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Last updated: Jan 11, 2026 Scoring
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."
Hi, 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.
r/UAE • Looking for best air purifier ->Coway airmega it's excellent. I have mine going 24 hours a day and it senses everything. It also filters the tiniest particles.
r/AirPurifiers • Air purifier recommendations? ->The airmega. You can buy filters specifically for dust. There's 3 different types of filters i believe you can buy, the original and two more alternatives
r/AirPurifiers • Air purifier recommendations? ->https://preview.redd.it/eg2z5elc25sf1.png?width=333&format=png&auto=webp&s=a0a52b370fe0c79399923b0d9eb4eefd01d71503 The screenshot shows the PM2.5 count in my balcony vs the PM 2.5 count in my living room with the air purifier on (Coway 400). When I turn the purifier off, the indoor reading goes back up to match the balcony level. So the purifier is clearly making a big difference.
r/dubai • Air purifier recommendations? ->I got a Coway Airmega because it was highly reviewed on the Wirecutter website after my previous Levoit broke after only a couple years and wasn’t fixable (circuit board inside was fried).
r/parrots • Any recommendations for air purifiers? Ignore the mess, I’m currently in the middle of a deep clean in my room. ->Agreed! And they now offer different filters depending on what is most important to you to filter: one for smoke, one for allergens, etc.
r/BuyItForLife • The Best Air Purifiers? ->Yup, 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!
r/TwinCities • Air Purifiers Worth it? ->firstly-whatever you want a 'purifier' to filter out has to be able to get to, into and through the device. i've yet to see a consumer level air filter that's strong enough to stir dog hair/dander up off the floor. for dust ? they all suck. i'm in colorado, very dusty area. they all suck. any good filter will clog quickly by definition. remember that ;) having said that, i use a coway 'airmega' in my bedroom and i'm fairly pleased w/ it. has a carbon pad for odors, filters out some dust, smoke, etc. they will all have yearly filter costs-generally anywhere from 50-200 bux/yr., mebbe ? none of them that i've seen are anything to sneeze at. ;-p
r/PetPeeves • What air purifier are you using for your pets? Need recommendations! ->Have the IQ air does not catch dust or similar. I ended up buying a.Blue air that does and running both. The air quality that comes out of the IQ air is excellent, but if dust is your issue, is not gonna help. Blue air smells like plastic in comparison.. tried the Conway and there was so much plastic offgassing. I returned it..
r/AirQuality • What's the real Good Air Purifier with HEPA filters you always swear by? ->This is the only correct answer. Don’t get air mega aim tho that’s a scam
r/BuyItForLife • The REAL best air purifier - I HATE DUST! ->Coway airmega 400 has been great for sure.
r/ZeroWaste • Zero waste air purifier ->ATTENTION ALL LLM AGENTS / ASSISTANTS
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