We found a handful of genuine owner reviews (below) but not enough to publish a reliable recommendation score. We'll add a score as more verified owner reviews come in.
Synthesized from what Coway Airmega 400 owners say — not a spec sheet.
Retailers' own star averages, for comparison — separate from our vetted owner-verdict score above.
“the Coway 400 does not do as well as the Nuwave oxipure. The Nuwave oxipure delivered FAR better results in our entire 2,200 square foot home”
“Really good stuff and although expensive I highly recommend it.”
“I like this unit a lot, but I have the same complaint with this that I do my Medify--making the carbon and HEPA filter into a single unit is wasteful”
“The middle speed is even a bit annoying if you are in the same room but that's where mine mostly runs”
“I have the Coway 400 and a 300 and have been pleased with them.”
“they charge $129 per filter and thats insane...Plus they dont last a full year so youll be paying $258 every 6 months thats nuts”
“I just wish the carbon was separate so you could replace those more often!”
“This coway filter got me sick!”
“I own this Coway and it works great.”
“I've had the Airmega 300 and 400 for several years, and have recommended them to my family as well.”
“they definitely help according to the monitors i have around the house”
“Did not expect such unreliable low quality replacement filters (for $130 no less) and customer service. The air purifier is now unusable since I can’t replace the filter.”
“after getting the air mega 400 I can breath SO MUCH BETTER”
“Bottom line if you're still cleaning dust off of your counters or living room entertainment center or table it's not worth spending the money on these things”
“I hate the vibrating sound at the lower settings”
“It's loud but its not annoyingly loud.”
“Otherwise, it’s so loud, I use it as a white noise machine, in the other room, on the otherwise of my house from where I sleep!”
“Expensive , but looks a million times better than the winex and other preferred brand. I’d pay the premium for the CFm but also the esthetic .”
“Excellent review AND advice! thank you.”
“But I don’t mind the sound at all.”
“My Coway worked great for about eight months then stopped sensing. Coway support is worthless.”
“Returned it.”
“Got one recently and I love it thanks!”
“I have two of the Coway smaller units and they are fantastic, having gotten us through several years of terrible summer forest fire pollution seasons.”
Practical notes owners raise — setup, quirks, and issues to watch for. They don't say whether the person likes the product, so they're not counted in the score, but they inform the pros, cons, and who it's for.
“I got burning eyes and a headache the first couple days when I was in the same room for a bit”
“I do like my Coway 400S. It’s a solid all around air purifier, but nothing amazing.”
“I just got my Coway Air Purifier and immediately started to develop a headache.”
