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phoinix | Staff 89K Views
Feb 13, 2026 8:05 AM

Coway Airmega 400 True HEPA Smart Air Purifier (White)

$349

$649

46% off
+ Free Shippingat Amazon
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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 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
Community Notes
About the Poster
Deal Details
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 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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Top Comments

elsenor
703Comments
80Reputation
We've had an airmega 400 for about 6 years and it still works great. We also use the aftermarket replacement filters and can't tell a difference (FWIW we don't buy the cheapest and are from some "filter" company on Amz). Even if the OEM are better and have more carbon, I don't care when the non-OEM are half the cost. When I clean the filter screens, I also vacuum the outfacing part of the filter where the little bits of carbon are.
Go to Comment
YwVJZXkD
369Comments
57Reputation
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.
Go to Comment
PatrickH2067
126Comments
17Reputation
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.
Go to Comment

Community Reviews

The Coway Airmega 400 is a large, smart HEPA purifier that moves a lot of air and does a strong job cutting dust, odors, and airborne particles. It works well in bigger spaces, can run around the clock, and the auto sensor and scheduled high speed mode help it collect plenty of debris on the prefilter. Long term durability looks solid, with multiple reports of years of trouble free use. The main drawbacks are expensive replacement filters, especially for the pair, plus occasional complaints about chemical smells, noise, WiFi setup hassles, and no child lock. A capable whole home style purifier if upkeep cost and size are acceptable.

Common Questions (5)

AI-generated summary based on comments from the community. Updated ago

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132 Comments

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Feb 22, 2026 4:31 AM
911 Comments
Joined May 2013
reffmanFeb 22, 2026 4:31 AM
911 Comments
Quote from swansong119 View quoted comment :
Not the person you asked but I use discountfilters.com, haven't noticed an issue, no weird smells. they have filters for a lot of different appliances and brands
Thanks for the rec.
Feb 22, 2026 11:33 AM
1.8K Comments
Joined Apr 2009
atarilynxFeb 22, 2026 11:33 AM
1.8K Comments
Personally I prefer the Mila purifiers as I like the app and interface, plus they do A great job. Sure this is good too.
Feb 22, 2026 5:18 PM
443 Comments
Joined Sep 2017
slicknewbie1Feb 22, 2026 5:18 PM
443 Comments
Nice deal
3
Feb 22, 2026 5:22 PM
911 Comments
Joined May 2013
reffmanFeb 22, 2026 5:22 PM
911 Comments
Quote from groovadelickun View quoted comment :
I purchased two of these through the years and continue to work great!
However, if u have cats, they may love to jump on them and change the settings 😉
I 3-d Printed some covers and problem solved Smilie
Thanks for the review and HU about cats!
Feb 22, 2026 5:39 PM
83 Comments
Joined Nov 2016
jayhat2004Feb 22, 2026 5:39 PM
83 Comments
Quote from YwVJZXkD View quoted comment :
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.
Cats love standing on them too
Feb 22, 2026 7:03 PM
197 Comments
Joined Jan 2021
HondaBoy619Feb 22, 2026 7:03 PM
197 Comments
How does this compare to building a custom one with a box fan and HVAC filters?
Feb 22, 2026 7:45 PM
78 Comments
Joined Nov 2025
alecmed8292Feb 22, 2026 7:45 PM
78 Comments
Breath of fresh air
1

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Feb 22, 2026 8:04 PM
214 Comments
Joined Dec 2013
UltLurkerFeb 22, 2026 8:04 PM
214 Comments
How did these compare to the stand up winix air filters?
Feb 23, 2026 1:59 AM
461 Comments
Joined Jun 2005
coach_x+Feb 23, 2026 1:59 AM
461 Comments
I made my own with a box fan run it in the basement 24/7. I could probably sell these because it uses regular house filters
Feb 23, 2026 3:48 AM
1.3K Comments
Joined Sep 2015
RyanJ7344Feb 23, 2026 3:48 AM
1.3K Comments
I also really don't understand how air filters are able to command such premium prices, (these, blueair, etc) for what is essentially a fan in an enclosure box.

Additionally, manufacturers profit from huge margins on filter sales.
Feb 23, 2026 3:50 AM
208 Comments
Joined Mar 2020
JollyHose932Feb 23, 2026 3:50 AM
208 Comments
Have this brand running 24/7 for the past 8 years. No issues . Just replace filters when the lights come on. Yes you can make your own using a box fan for cheap etc etc but your box fan does not adjust speed based on air quality this down. Box fan also looks cheap. I would put a boxfan in the basement away from my eyes but keep this in living spaces.
Feb 23, 2026 4:08 AM
49 Comments
Joined Apr 2013
NikoBFeb 23, 2026 4:08 AM
49 Comments
Recall?
Feb 23, 2026 5:56 AM
82 Comments
Joined May 2017
FirmFeb 23, 2026 5:56 AM
82 Comments
Quote from scubahead View quoted comment :
Crazy. I just looked at one of these in my local thrift shop, Saint Vincent DePaul. Brand spankin new, in box, original filters still wrapped in their plastic bags. They have a price tag on it $125. I'll take this as a sign. I should go retrieve it.
Get me one too please!
1
Feb 23, 2026 8:39 AM
4.6K Comments
Joined Jan 2012
RedElmoFeb 23, 2026 8:39 AM
4.6K Comments
Quote from scubahead View quoted comment :
Crazy. I just looked at one of these in my local thrift shop, Saint Vincent DePaul. Brand spankin new, in box, original filters still wrapped in their plastic bags. They have a price tag on it $125. I'll take this as a sign. I should go retrieve it.
Dang! I need to go shop at thrift store more. I heard there can be good things to be had. But I never actually go!
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Feb 23, 2026 8:40 AM
4.6K Comments
Joined Jan 2012
RedElmoFeb 23, 2026 8:40 AM
4.6K Comments
Quote from coach_x+ View quoted comment :
I made my own with a box fan run it in the basement 24/7. I could probably sell these because it uses regular house filters
I did too lol. I had extra AC filters from a old AC system. So didn't want the filters to goto waste.

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