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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 76,526 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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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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Pro
Feb 14, 2026 12:16 PM
4,812 Posts
Joined Feb 2006
Tazmania99
Pro
Feb 14, 2026 12:16 PM
4,812 Posts
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.
2
Feb 14, 2026 09:03 PM
686 Posts
Joined Jul 2007
kamiraaFeb 14, 2026 09:03 PM
686 Posts
great filters , love mine
Pro
Expert
This user is an Expert in Home & Home Improvement
Feb 15, 2026 02:44 AM
17,411 Posts
Joined Jul 2008
gabe23111Feb 15, 2026 02:44 AM
Pro
Expert
This user is an Expert in Home & Home Improvement
17,411 Posts
Quote from PatrickH2067 :
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.
Helpful info. Thanks
Feb 15, 2026 04:27 PM
499 Posts
Joined Jul 2013
airj1012Feb 15, 2026 04:27 PM
499 Posts
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!
Feb 15, 2026 10:31 PM
55 Posts
Joined Jun 2016
miimarioFeb 15, 2026 10:31 PM
55 Posts
Quote from YwVJZXkD :
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.
We discovered that recently when one of my nieces and nephew were here. Luckily they couldn't really break anything on it, aside from just change the settings temporarly or reset the prefiler cleaner timer.

I will add, we've had our 400 model for 7 years and leave it on 24/7 (usually on low- until kids change it lol) and it's still working just fine. I'm very tempted to get another one.
Feb 16, 2026 05:19 PM
193 Posts
Joined Oct 2020
Veilside67r1Feb 16, 2026 05:19 PM
193 Posts
Well I got mine today but it was heavily damaged in shipment, so it's going back.
Feb 16, 2026 09:51 PM
6,376 Posts
Joined Jan 2006
Blade2000Feb 16, 2026 09:51 PM
6,376 Posts
Quote from tntvu :
How often do you run them?
I have 2 in my home as well. One on the second floor and one in the finished basement. Both run 24/7 and work great.
2

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Feb 17, 2026 06:15 PM
18 Posts
Joined Oct 2025
BlueStove779Feb 17, 2026 06:15 PM
18 Posts
Thanks!
1
Feb 17, 2026 06:29 PM
148 Posts
Joined Oct 2016
TskspreeFeb 17, 2026 06:29 PM
148 Posts
I bought this in 2023 on a deal. It started to make unpleasant noises in 10 months. I got a replacement unit and this one has been fine 23 months in.
Feb 17, 2026 06:51 PM
60 Posts
Joined Apr 2017
shotseeFeb 17, 2026 06:51 PM
60 Posts
I purchased two of these. They have been awesome. One downstairs and one upstairs. I purchased them through my HSA account when they went on sale.
Feb 17, 2026 07:16 PM
1,214 Posts
Joined Jan 2016
nikoli707Feb 17, 2026 07:16 PM
1,214 Posts
Plenty of youtube videos testing filter longevity, flow rates, particle metrics, etc. for a wide range of filter types. These coway filters are pretty robust. If you live in a relatively clean environment and clean/care for these filters properly they will last years with minimal performance drop (flow) while maintaining near 100% particulate capture. The only real reason to be replacing the filter is to get fresh charcoal odor control. 3-5 years is more than good enough.
Feb 17, 2026 07:19 PM
439 Posts
Joined Nov 2010
mhoward84Feb 17, 2026 07:19 PM
439 Posts
Quote from AegisX :
How much better is this compared to the older model Coway AP-2015F? My house is very dusty but that price tag keeps me away from this.
If you're looking for a good value to performance, look into CR boxes. My son and I designed and 3d printed a nice one that uses two Costco 3M 2200 20x30 filters ($10-12/ea). CADR is better than this (but has no carbon) and cost like $70 to build and uses reeeeeally quiet, efficient PC fans that cost about $4/ea.
2
Feb 17, 2026 08:30 PM
589 Posts
Joined Nov 2015
dollardogFeb 17, 2026 08:30 PM
589 Posts
Quote from YwVJZXkD :
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.
My cat likes to jump on mine and manages to change the settings with her little paws.
1
Feb 18, 2026 01:49 AM
1,067 Posts
Joined May 2019
Impulse_shopperFeb 18, 2026 01:49 AM
1,067 Posts
Quote from gabe23111 :
Have you ever tried aftermarket filters? I'm overdue to replace my filters and tempted to get aftermarket as it's less than a 3rd of the price right now vs the genuine. I noticed on the genuine filter [amazon.com] there are a nice handful of recent reviews complaining about a weird odor.
The aftermarket filters are trash. They don't even compare to the genuine filters. And the genuine filters are so expensive. I sold my 400s and just bought a couple Winix from Costco. This was a solid purifier though, just too expensive for upkeep for a single unit.
1

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Feb 18, 2026 02:37 AM
1 Posts
Joined Nov 2025
rainingdayz78Feb 18, 2026 02:37 AM
1 Posts
Quote from PhilG9974 :
How much of a difference do these make as far as dust? I'm in a very dusty house
I recommend keeping windows fully closed when using any air filtration system. Crack them at most if fresh air exchange is absolutely needed. This prevents the unit's fan from drawing in unfiltered outdoor pollutants through its intake, rendering the filter ineffective at purifying your indoor environment.

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