Coway

Airmega 400S

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Coway Airmega 400S

Overall

#35 in

Air Purifiers

according to Reddit Icon Reddit

User sentiment76% positive
26
4
4

Top Pros

Top Cons

Last updated: Apr 8, 2026

Reddit Reviews

Reddit IconCalmSeaweed1360 1.0
r/moderatelygranolamomsWhat are the Best Air Purifiers for Pets? Do you notice any clear difference when using them?
5 months ago

I’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.

Reddit IconCaptainSwinky 1.0
r/PetsAdvice on choosing the best air purifiers for pets - Are they really worth it?
12 months ago

I’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.

Reddit IconCicada- 1.0
r/BuyItForLifeBest air purifier to buy right now?
4 months ago

fwiw, I’ve had 3 Coway airmega 400S’ running nonstop since the COVID lockdown and they’re all doing fine 5+ years later

Reddit Iconconfused_megabyte 1.0
r/AirPurifiersGonna get another Coway air purifier
9 months ago

Ugh. 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.

r/AirPurifiersGonna get another Coway air purifier
9 months ago

They aren’t going to price match 400 price for 400S. The price of 400S hasn’t changed.

Reddit Icondenishill 1.0
r/smarthomeWhat's the best air purifier you've tried? Worth it or a Scam?
12 months ago

Yeah Coway Airmega works so well. I have S400 and it's been fantastic.

Reddit IconFit-Interview-3886 1.0
r/moderatelygranolamomsWhat are the Best Air Purifiers for Pets? Do you notice any clear difference when using them?
6 months ago

I’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.

Reddit IconIHaveASloth 1.0
r/AirPurifiersHelp with recommendations before I lose my marbles
5 months ago

Why 350/450 for large open spaces? Is my 400S not optimal for large open spaces? I have a huge open floor plan on the main floor which is where it is now.

Reddit IconKlutzy_Monk1880 1.0
r/homeownersHow many have air purifiers running nonstop?
about 1 month ago

One in every room. Living room has a Conway 400s so it’s like a rectangular shape one that blows air upwards. I put a standing rack on top of it so I can dry things like ziplock bags and whatnot faster using the air it’s always blowing. lol.

Reddit Iconlalabearo 1.0
r/moderatelygranolamomsWhat are the Best Air Purifiers for Pets? Do you notice any clear difference when using them?
11 months ago

second 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

Reddit Iconmikebrooks008 1.0
r/AirQualityWhat's the best pick of home air purifier that you've ever used for improving indoor air quality?
7 months ago

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

r/homeownersFor those who suffer from allergies, which air purifier really works well in your opinion?
9 months ago

Same here! Got one for each room last year, and very satisfied with it so far.

r/homeofficeBest air purifier
9 months ago

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

r/homeownersWhat's the best air purifier for home you swear is really worth buying today?
9 months ago

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.