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frontpagephoinix | Staff posted Feb 13, 2026 08:05 AM
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frontpagephoinix | Staff posted Feb 13, 2026 08:05 AM

Coway Airmega 400 True HEPA Smart Air Purifier (White)

+ Free Shipping

$349

$649

46% off
Amazon
132 Comments 76,506 Views
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Deal Details
Update: This popular deal is still available.

Amazon has Coway Airmega 400 True HEPA Smart Air Purifier (White) for $349. Shipping is free.

Thanks to Deal Hunter phoinix for sharing this deal.

Product Details:
  • Designed to clean spaces up to 3,120 sq. ft. in 60 minutes
  • Combination of a pre-filter, active carbon filter, and HEPA Filter reduces 99.97% of 0.3 micron particles, including pollen and other allergens. It also reduces volatile organic compounds and odor
  • With its Smart Mode feature, the Airmega automatically adapts to its surroundings by adjusting fan speeds based on the room's air quality; That means your unit is energy efficient without compromising effectiveness
  • When the air quality in the room remains purified for 30 minutes or more in Eco Mode, the fan will turn off to conserve energy, kicking on again when pollution is detected
  • When the Airmega's built-in light and pollution sensors detect that the room has been dark and the air clean for 3 minutes, Sleep Mode reduces the purifier's noise and power consumption

Editor's Notes

Written by powerfuldoppler | Staff
  • About this Deal:
    • Our research indicates that this deal is $183.00 less (34% savings) than the next best available price from a reputable merchant with prices starting at $532.00 at the time of this posting.
  • About this Product:
    • Rated 4.5 out of 5 stars at Amazon based on over 6,470 customer reviews.
  • About this Store:
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by phoinix | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Update: This popular deal is still available.

Amazon has Coway Airmega 400 True HEPA Smart Air Purifier (White) for $349. Shipping is free.

Thanks to Deal Hunter phoinix for sharing this deal.

Product Details:
  • Designed to clean spaces up to 3,120 sq. ft. in 60 minutes
  • Combination of a pre-filter, active carbon filter, and HEPA Filter reduces 99.97% of 0.3 micron particles, including pollen and other allergens. It also reduces volatile organic compounds and odor
  • With its Smart Mode feature, the Airmega automatically adapts to its surroundings by adjusting fan speeds based on the room's air quality; That means your unit is energy efficient without compromising effectiveness
  • When the air quality in the room remains purified for 30 minutes or more in Eco Mode, the fan will turn off to conserve energy, kicking on again when pollution is detected
  • When the Airmega's built-in light and pollution sensors detect that the room has been dark and the air clean for 3 minutes, Sleep Mode reduces the purifier's noise and power consumption

Editor's Notes

Written by powerfuldoppler | Staff
  • About this Deal:
    • Our research indicates that this deal is $183.00 less (34% savings) than the next best available price from a reputable merchant with prices starting at $532.00 at the time of this posting.
  • About this Product:
    • Rated 4.5 out of 5 stars at Amazon based on over 6,470 customer reviews.
  • About this Store:
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by phoinix | Staff

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Price Intelligence

Model: Coway Airmega 400 True HEPA Air Purifier with 1560 sq. ft. Coverage

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Top Comments

YwVJZXkD
355 Posts
57 Reputation
I like this unit, but one thing that I realized too late... there is no child lock feature, and these buttons are at child height, and they make fun sounds turn lights on and off.
PatrickH2067
113 Posts
17 Reputation
The aftermarkets aren't as good. No doubt about it. Less air flow because they have fewer pleats. I counted seven less pleats one time, and five less another time. In large rooms, or especially a whole house, this makes a difference. You will see dust in the air next to windows when you get further away from the filter.
This last time I spent the money on Coway filters and can say I am happier. ultimately worth the price. I can tell the air is 'lighter' when I change the filters. More so than when I'd change out to aftermarket. The carbon also lasts a LOT longer. There is a smell in the air when the carbon stops working. It's distinct. The carbon in the Coways easily last twice as long. But this isn't a deal breaker. As the carbon in the Coways don't last as long as the HEPA part either. You can give them a good shake, to extend the life of the carbon. Doing so introduces new cracks and crevices within the pieces of carbon for the air to filter through. Be sure the vacuum it first. Shake with the carbon part of the filter pointed down. And vacuum again afterwards. Because you will get carbon dust, it's just little pieces of charcoal, all in your HEPA, reducing the lifespan.
darren_fsl
183 Posts
34 Reputation
I have two of these 400 series (along with a Pro X and (4) 200Ms running all the time in my house (high air pollution where we live), and have no problem using non-OEM filters as replacements. They're fine. I seriously doubt that Coway makes their own HEPA filters; so they're likely sourcing them from China, too. Carbon pellets/filters don't last as long as the HEPA filters anyway, so you're only removing VOCs and smells for the first part of your filter life anyway. Like others have noted, just clean your filter screens often, vacuum or dust off the HEPA filter on the carbon side, and you'll get 9mos to a year.

132 Comments

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Feb 19, 2026 03:30 AM
1,430 Posts
Joined Jun 2009
NSTarFeb 19, 2026 03:30 AM
1,430 Posts
is it as good as this? I may get one if comparable
https://enviroklenz.com/product/e...-uv-model/
Feb 19, 2026 05:40 AM
933 Posts
Joined Jul 2007
fubagFeb 19, 2026 05:40 AM
933 Posts
Ehh lot of folks commenting on 3rd party filters but even wirecutter wrote : "We tested two popular third-party replacement-filter sets for the Mighty, made by Cabiclean and Durabasics, and neither gave off any noticeable odor. They performed almost identically to the genuine Coway filter in our smoke tests, so we're confident in recommending them. One caveat: Coway told us that "if a problem is identified using a third-party filter, the customer does not receive warranty service."
Feb 19, 2026 06:00 AM
954 Posts
Joined Jul 2005
psuvetteFeb 19, 2026 06:00 AM
954 Posts
Quote from Tazmania99 :
We've had this for two years. Very happy with this. It is sensitive. When my pet cat passes by, it automatically kicks on. When my son farts, the machine detects it right the way. In average, we replaced the filters once a year. We use this 24x7 in winter and during the summer when our AC is on. You don't use it when you have your windows open.
If it detects farts, it would run continuously for me
1
2
1
Feb 19, 2026 06:20 AM
223 Posts
Joined Nov 2025
ForHassanFeb 19, 2026 06:20 AM
223 Posts
How is the ozone production on these products?
Feb 19, 2026 09:17 AM
971 Posts
Joined Dec 2005
jimschoiceFeb 19, 2026 09:17 AM
971 Posts
Quote from airj1012 :
Tempting price. Thinking about geting one for my downstairs, which is roughly 1,200 square feet. Or would it make sense to get two air purifiers like Winix 5520 so their aren't any dead zones. Or some other version where I could purchase two for roughly the same price. But 46% definitely has my spidysenses going off!
I bought the 400 and regret it. I should have gotten two of the smaller ones instead. The 400 is noisy on any speed above low, at which it doesn't move much air. I have a 200 in the bedroom that runs on speed 2 continuously and it collects much more dust than the 400. I have a couple of Winix as well, but they start making fan bearing noises after a while. The 5500 (first purifier I ever bought about 6 years ago) has lasted much longer than the 2 AM80's I bought at Costco. One of them got thrown out already and was replaced by the Airmega 200.
1
Feb 19, 2026 09:22 AM
971 Posts
Joined Dec 2005
jimschoiceFeb 19, 2026 09:22 AM
971 Posts
Quote from misterv1 :
This or blue air?
I returned 2 blue air to Costco because the awful smell from their filters was giving us headaches! They looked nice and were quiet. But both had that terrible chemical smell that didn't go away after a week.
Feb 19, 2026 10:53 AM
1,326 Posts
Joined Nov 2010
JusthathoughtFeb 19, 2026 10:53 AM
1,326 Posts

Our community has rated this post as helpful. If you agree, why not thank Justhathought

Get the Levoit 600s whole house WiFi unit...I spent hours (winter time and bored) researching filters and deciding on it because of filter replacement cost and effectiveness. 2 years later all three have had no issues, bought one for my sister as well.
1

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Pro
Feb 19, 2026 04:34 PM
1,328 Posts
Joined Jan 2024
CoolKestrel1061
Pro
Feb 19, 2026 04:34 PM
1,328 Posts
If you're going to go expensive, go Austin Air. Hepa + charcoal filters. Best on the market IMHO. filters last 5 years.
Feb 19, 2026 05:32 PM
326 Posts
Joined Sep 2017
slicknewbie1Feb 19, 2026 05:32 PM
326 Posts
Nice deal
Feb 19, 2026 06:05 PM
43 Posts
Joined Oct 2018
FauxnohFeb 19, 2026 06:05 PM
43 Posts
Quote from Clint3200 :
All the replacement filters for these (even OEM) stink like chemicals.I gave up and got rid of the Coway and went with another brand.Check the reviews. Many people notice the terrible smell of the replacements.
We received ours yesterday and I can attest, it does smell like chemicals. We're currently running it in a closed room with the window open.
Feb 19, 2026 08:25 PM
1,572 Posts
Joined Dec 2007
VMaskedFeb 19, 2026 08:25 PM
1,572 Posts
Quote from ForHassan :
How is the ozone production on these products?
no ionization
Feb 19, 2026 08:27 PM
1,572 Posts
Joined Dec 2007
VMaskedFeb 19, 2026 08:27 PM
1,572 Posts
Quote from CoolKestrel1061 :
If you're going to go expensive, go Austin Air. Hepa + charcoal filters. Best on the market IMHO. filters last 5 years.
i was looking at one but its heavy as hell, loud and not power efficient. Debating if its really that good taking out VOCS
Feb 19, 2026 08:29 PM
1,572 Posts
Joined Dec 2007
VMaskedFeb 19, 2026 08:29 PM
1,572 Posts
Quote from g0dM@n :
I have the winix also and the aftermarket filters have been cheap and great! Costs me $25 annual for a pack of these filters.
https://www.amazon.com/dp/B00LB22J78

I do like the unit on this deal. If filter cost is high, I won't bite. I'm fine with upfront cost for a nice unit, but the filter cost is what'll add up.
I have a winix c535 is this replacement filter good for it because some reviews on amazon say it's too thick so you can't close the machine... have you had that problem? Also is there any chemical smell from the replacement filtered? c
Feb 19, 2026 10:23 PM
150 Posts
Joined Jul 2013
cpham4Feb 19, 2026 10:23 PM
150 Posts
How does this compare to the Winix air purifiers from Costco?

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Feb 20, 2026 01:06 AM
6,275 Posts
Joined Jul 2008
hanabieFeb 20, 2026 01:06 AM
6,275 Posts
Quote from CoolKestrel1061 :
If you're going to go expensive, go Austin Air. Hepa + charcoal filters. Best on the market IMHO. filters last 5 years.
So you only need to replace filters every 5 years???!!

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