Coway - Airmega 400S
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Based on 1 year's data from Feb 27, 2026 How it works
Liked most:
15
0
"Its true HEPA filter grabs fur and dander"
"I have a double coated dog and a cat and I really think it helps a lot. ... My dad who has really bad pet allergies commented about how little he felt his allergies coming on the last time he was over."
"It’s pricey, but it actually cleared that faint pet smell that never goes away no matter how much you clean."
17
0
"in the lowest fan mode, it's very quiet to me. ... it was the high fan kicked on and it created less sound than an window air conditioner would ... Overall, I'd recommend this unit merely for the size of it and the fact that it really isn't that loud. Do you notice it on medium and high power? Yes. Is it a distraction? No. ... I only have to adjust the TV volume slightly when it kicks over to medium or high speed. I can live with it. ... I was surprised by how un-intrusive this has been noise wise. ... it is not terribly loud. Will you hear it on medium and high speed? Yes. It only requires me to slightly adjust the volume on my TV. I was overall impressed with the sound levels to the point where I was considering another brand for another room and now I'm considering just getting another 400. ... The sound doesn't really bother me. It's very subjective but even on high, it's not overbearing like some machines I've been around. ... I have heard several air purifiers that don't come close to the quietness of this model, even on high. ... For the size of the fan and the capacity it purifies air, I feel its functions very well, even when it comes to noise levels, on the highest mode."
"Silent"
"I have 2 Coway airmegas that are super quiet that I’ve had for nearly 2 years. ... its noise was very inconsistent and it was poorly constructed compared to the Coway Airmega"
25
0
"dealt with wildfire smoke perfectly."
"dealt with wildfire smoke perfectly."
"The sensors are amazing. ... Yes whenever I cook or smoke they instantly kick on and work really well."
15
0
"They've run 24/7 for years without an issue."
"I've had a Coway airmega going 24/7 for six years that hasn't developed any noise problems"
"we’ve had a Coway Airmega running continuously 24/7 for the last 6 years"
9
0
"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."
"great to put it on eco mode , as it detects poor air quality it automatically switches modes to higher setting and shows it as purple or red and once air is back to being good it goes back to eco mode and shows blue."
Disliked most:
4
3
"Unfortunately I recently returned two of my 400 models. I used to get a lot of vibration and loud buzzing."
"tops out at 52dB on high"
"I've also noticed that it winds up with less large or lint-type dust and hair, including cat hair, on the pre-filter than the multiple Coway 1512HH that we keep in other rooms and that we used to have in the same double room where the 400 is now. ... I think this is because of lower face velocity of the air, due to the 2x filter surface area (which on the plus side lowers resistance, increases energy efficiency and filter life, and decreases noise). ... And potentially also because it's higher off the floor. It may not be trapping all the heaviest particles, which would settle to the floor eventually in any case."
2
5
"the filter costs have you replacing filters every 3 or 4 months with full use."
"DO not buy their filters directly from them - way overpriced"
"Filters are $$$."
0
3
"tried the Conway and there was so much plastic offgassing. I returned it.."
"While it was able to reduce PM2.5 drastically, it made no difference to VOCs which my Airthings View Plus consistently detects around 250 ppb."
"The Coway hasn’t helped remove any VOC for us."
3
1
"tried the Conway and there was so much plastic offgassing. I returned it.."
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."
CalmSeaweed1360 1.0I’ve got two cats and a golden retriever, so air purifiers became non-negotiable for me. The one that’s made the biggest difference is the Coway Airmega 400S.
CaptainSwinky 1.0I’ve been drowning in dog and cat hair until I got a Coway Airmega 400S. Its true HEPA filter grabs fur and dander, and the activated carbon core neutralizes pet odors.
Cicada- 1.0fwiw, I’ve had 3 Coway airmega 400S’ running nonstop since the COVID lockdown and they’re all doing fine 5+ years later
confused_megabyte 1.0Ugh. I just bought a 400S a week ago. Should I return and get the 400 instead? I do like that I can tell google to turn it on or off. But it’s almost a 200$ convenience.
They aren’t going to price match 400 price for 400S. The price of 400S hasn’t changed.
denishill 1.0Yeah Coway Airmega works so well. I have S400 and it's been fantastic.
Fit-Interview-3886 1.0I’ve got two cats and a dog, so air purifiers were kind of a must for me. I’ve tried a few, and the one that made the biggest difference was the Coway Airmega 400S. It’s pricey, but it actually cleared that faint pet smell that never goes away no matter how much you clean.
lalabearo 1.0second the airmega! I did a lot of research and my pediatrician recommended it as well (not that she’s an air quality expert, but I do trust her opinion on a lot of things!) I have a double coated dog and a cat and I really think it helps a lot. I will also say, we recently moved into a house with a lot of carpet so we bought a new Miele vacuum. My dad who has really bad pet allergies commented about how little he felt his allergies coming on the last time he was over.m
mikebrooks008 1.0Same here! Got one for each room last year, and very satisfied with it so far.
Second the Coway Airmega! It is a beast, honestly. I’ve had it in my bedroom for over a year now, and you can literally feel the difference in air quality.
I bought the coway airmega last year and love it ever since. The filter is really easy to change and it runs pretty quietly on low settings.
I've had mine for about a year now (the 400S model) and you can genuinely feel the difference. I used to wake up stuffy every day because of city air and bad allergies, but after running the Airmega overnight in my bedroom, it pretty much solved that issue for me.
Second the Coway Airmega 400! I used to wake up stuffy almost every morning but after running it overnight for a couple weeks, it legit improved my sleep and the sneezing stopped.
Mtwat 1.0I rely on the Coway Airmega 400S for my dogs because it traps fur and helps with pet smells without getting too noisy.
I tried a Dyson TP07 once, but it felt pricey for my budget, so I leaned toward Coway Airmega because it handles pet hair and dust pretty nicely.
I have a Coway Airmega at home, and it handles smoke and pet dander well without getting too loud.
NothingDue5446 1.0The one that made the biggest difference for me was the Coway Airmega 400S. It’s quiet enough for my bedroom and still pulls fur and dander out of the air in bigger rooms.
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