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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)

  • It works well in a bedroom or main living area, but it is not ideal for moving air between floors or across a whole house. A common recommendation is one unit per floor or multiple smaller units for large, separated spaces.

    SensibleMeal1392EuphoriaFalconsponicMagentaSink1187

  • The HEPA/carbon filter set is commonly replaced about once a year, though some owners stretch it to 9 months to a year with regular pre-filter cleaning. In cleaner homes, genuine filters may last 3-5 years with minimal performance drop, while the carbon portion usually wears out sooner than the HEPA media.

    SensibleMeal1392darren_fslTazmania99nikoli707

  • Aftermarket filters are widely used and can work fine in the Airmega 400, with several owners reporting no noticeable difference in day-to-day performance. The main caveat is that some off-brand filters may have fewer pleats or less carbon, and using third-party filters can affect warranty service if a problem is traced to them.

    jeffboyardeeelsenorPatrickH2067fubag

  • It can be quiet on low, but some units develop a hum or whine at low speeds and get noisy above low. Replacement filters have also been reported to smell chemical-like, including OEM filters, so checking recent filter reviews before buying is useful.

    exhurtClint3200Fauxnohjimschoice

  • The WiFi/app setup can be finicky, and after a power outage it may lose connectivity and need a hard reset and re-adding to the app. The non-WiFi version avoids that hassle, while Alexa control is also available on the smart model.

    BrainDocslickdealgbSIR_of_Cricket

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

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132 Comments

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Feb 13, 2026 2:41 PM
403 Comments
Joined Nov 2003
ryewoodsFeb 13, 2026 2:41 PM
403 Comments

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I have two of these in my house, and they are amazing air purifiers. Replacement filters last a year or longer, but are expensive if you don't get them on sale.
Last edited by ryewoods February 13, 2026 at 06:43 AM.
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Feb 13, 2026 2:54 PM
17.8K Comments
Joined Jul 2008
gabe23111Feb 13, 2026 2:54 PM
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Quote from ryewoods View quoted comment :
I have two of these in my house, and they are amazing air purifiers. Replacement filters last a year or longer, but are expensive if you don't get them on sale.
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.
Feb 13, 2026 3:00 PM
1 Comments
Joined Feb 2026
SensibleMeal1392Feb 13, 2026 3:00 PM
1 Comments
I also have two in my house one for bedroom, one for main room and work well at circulating the air once an hour as advertised. filters are expensive. I vac the pre-filter screen but HEPA I replace twice a year. Keep in mind air sucks into both sides so there are 2x the filters to buy, they come in a pack of 2.
Feb 13, 2026 3:04 PM
105 Comments
Joined Jan 2013
jeffboyardeeFeb 13, 2026 3:04 PM
105 Comments

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Quote from gabe23111 View quoted comment :
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.
I have one and use aftermarket filters for some cost savings. I can say I don't notice a difference so it works for me
1
1
Feb 13, 2026 3:27 PM
3.8K Comments
Joined Oct 2003
elnino2783Feb 13, 2026 3:27 PM
3.8K Comments

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As everyone says, the replacement filter cost is expensive. I've bought the official filters for as low as $70, but they're as mush as $115 if not on sale. That's the cost total for the pair of filters you have to replace.

Reviews for the offbrand types tend to notice differences in weight that indicate there's less carbon in the carbon filter, or other differences
1
Feb 13, 2026 3:39 PM
703 Comments
Joined Dec 2010
elsenorFeb 13, 2026 3:39 PM
703 Comments

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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.
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Feb 13, 2026 3:44 PM
761 Comments
Joined Oct 2007
scubahead
Pro
Feb 13, 2026 3:44 PM
761 Comments

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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.
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Feb 13, 2026 3:45 PM
23 Comments
Joined Jan 2015
PhilG9974Feb 13, 2026 3:45 PM
23 Comments
How much of a difference do these make as far as dust? I'm in a very dusty house
1
Feb 13, 2026 3:54 PM
33 Comments
Joined Oct 2013
tntvuFeb 13, 2026 3:54 PM
33 Comments
Quote from ryewoods View quoted comment :
I have two of these in my house, and they are amazing air purifiers. Replacement filters last a year or longer, but are expensive if you don't get them on sale.
How often do you run them?
Feb 13, 2026 4:04 PM
212 Comments
Joined Nov 2015
darren_fslFeb 13, 2026 4:04 PM
212 Comments

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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.
3
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Feb 13, 2026 4:05 PM
369 Comments
Joined Oct 2006
YwVJZXkDFeb 13, 2026 4:05 PM
369 Comments

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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.
3
26
Feb 13, 2026 4:19 PM
125 Comments
Joined Feb 2011
phatsk807Feb 13, 2026 4:19 PM
125 Comments
Quote from darren_fsl View quoted comment :
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.
Keep in mind there are multiple versions of the Airmega that look just like this. They aren't all $650 MSRP. I have a 300 series that works well, but it looks almost the exact same as the 400.
1
Feb 13, 2026 4:19 PM
700 Comments
Joined May 2008
wiebel03Feb 13, 2026 4:19 PM
700 Comments

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Quote from PhilG9974 View quoted comment :
How much of a difference do these make as far as dust? I'm in a very dusty house
It'd significantly reduce it, but you'll have to change the filters a lot more than the recommended amount
1
Feb 13, 2026 4:29 PM
212 Comments
Joined Nov 2015
darren_fslFeb 13, 2026 4:29 PM
212 Comments
Quote from PhilG9974 View quoted comment :
How much of a difference do these make as far as dust? I'm in a very dusty house
It will make a big difference if 1.) you remember that the dust must be airborne, and 2.) you have reasonable expectations for it's reach into bedrooms or different floors. You'll probably want to start off cleaning the prefilter every two weeks. If you manually dust your house, generating a lot of airborne dust in the process, this unit will help capture the fine particles that otherwise just settle backdown eventually. It's made a big difference in our allergies. But we still have to vacuum and dust. These things are expensive, no doubt. But they do work.

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Feb 13, 2026 4:42 PM
941 Comments
Joined Sep 2013
chrisaf69Feb 13, 2026 4:42 PM
941 Comments
Quote from elsenor View quoted comment :
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.
Do you mind sharing a link to the filters you get?

I purchased this, and like my smaller coway iPod-looking-units for the bedrooms will get non-oem filters, but want decent ones even if they aren't the cheapest.

Thanks!

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