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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

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.

  • households with pets (like a cat or dog) because commenters said auto-detection is sensitive to pet-related odor/particles and the pre-filter can be vacuumed regularly to keep up with the extra activity.

  • buyers who are okay managing filter costs by using non-OEM replacements because multiple owners said they use aftermarket filters and "can't tell a difference," and one long-term owner reported the unit still works great after years with non-OEM filters.

  • people who can tolerate app/WiFi setup quirks because if you're willing to use the app for schedules, owners reported very good performance (including running high at night for white noise) and the non-WiFi version was also reported as working well in a master bedroom.

  • homeowners running one purifier in a bedroom and another in a main work/living area because it can circulate air effectively (they reported it working well about once an hour) and they found HEPA filter replacement about twice a year with regular pre-filter vacuuming.

  • people who want to keep windows closed while purifying indoor air because one commenter specifically warned that if you run it with windows open, the fan can pull in unfiltered outdoor pollutants and reduce effectiveness.

  • people who are sensitive to chemical odors from replacement filters because multiple commenters reported that replacement filters (even OEM) can smell like chemicals and one person stopped using the Coway after noticing the terrible smell.

  • shoppers trying to purify across multiple floors with a single unit because commenters said it doesn't do well between floors/enclosed spaces and recommended multiple units for big rooms throughout the floors.

  • parents with young kids because one owner said there's no child lock and the buttons are at child height, so kids can trigger sounds and turn lights on/off.

  • buyers who rely on stable WiFi after power outages because a commenter said the unit loses WiFi after power goes out and requires a hard reset and re-adding to the app.

  • people who want quiet operation at low speeds because one owner reported an annoying hum/whine at low speeds.

Common Questions (5)

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132 Comments

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Feb 13, 2026 5:02 PM
21 Comments
Joined Dec 2008

This comment has been rated as unhelpful by Slickdeals users.

Feb 13, 2026 5:03 PM
201 Comments
Joined Apr 2016
swansong119Feb 13, 2026 5:03 PM
201 Comments
Quote from chrisaf69 View quoted comment :
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!
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
Feb 13, 2026 5:13 PM
2.2K Comments
Joined Jul 2008
kfunk7Feb 13, 2026 5:13 PM
2.2K Comments
Quote from tntvu View quoted comment :
How often do you run them?
I have 2 of these at home also. I leave them on 24/7
Feb 13, 2026 5:37 PM
3.2K Comments
Joined Nov 2005
BrainDocFeb 13, 2026 5:37 PM
3.2K Comments

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I have one of these. It works very well. The only issue is that connecting it to WiFi is a hassle. You need to use the app to set it on schedules. Whenever power goes out (which is rare at my house, but it happens), it loses the WiFi connectivity and I have to do a hard reset and get it added back to the app. I have many "smart" devices and it's the only one that consistently gives me troubles.
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Feb 13, 2026 6:22 PM
1.3K Comments
Joined Nov 2015
kjvmartinFeb 13, 2026 6:22 PM
1.3K Comments
We use the non WiFi version in our master bedroom. Smart mode during the day, run on high at night for white noise. Very good item.
Feb 13, 2026 6:47 PM
23 Comments
Joined Jan 2015
PhilG9974Feb 13, 2026 6:47 PM
23 Comments
Quote from wiebel03 View quoted comment :

It'd significantly reduce it, but you'll have to change the filters a lot more than the recommended amount
thanks!
1
Feb 13, 2026 7:15 PM
609 Comments
Joined Apr 2015
AegisXFeb 13, 2026 7:15 PM
609 Comments
Quote from SensibleMeal1392 View quoted comment :
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.
Are there third-party filter that you could use with? I have the previous AP-1512HH model and used some off brand filters that worked just fine.

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Feb 13, 2026 7:48 PM
609 Comments
Joined Apr 2015
AegisXFeb 13, 2026 7:48 PM
609 Comments
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.
Feb 13, 2026 7:56 PM
4 Comments
Joined May 2021
HilariousRock6939Feb 13, 2026 7:56 PM
4 Comments
Good find! By the way, you can get the small CB incentives + avoid the sales tax if you do not live in CA, CT, FL, GA, IL, MD, MI, NV, NJ, NY, NC, PA, SC, TX, VA, WA, or DC by purchasing directly from cowaymega (same price).
1
Feb 13, 2026 11:08 PM
126 Comments
Joined Sep 2012
PatrickH2067Feb 13, 2026 11:08 PM
126 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.
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.
3
Feb 14, 2026 12:28 AM
16.2K Comments
Joined Jan 2010
Ride_The_SkyFeb 14, 2026 12:28 AM
16.2K Comments
How many years have they been making them, I'm worried they moght stop making filters.
2
Feb 14, 2026 12:31 AM
16.2K Comments
Joined Jan 2010
Ride_The_SkyFeb 14, 2026 12:31 AM
16.2K Comments
By the way, juat ordered two. One for each floor. I doubt it can clear bedrooms from living room but I can move them around.
1
Feb 14, 2026 1:41 AM
275 Comments
Joined Aug 2011
Scott07Feb 14, 2026 1:41 AM
275 Comments
How's the 400 compare to the 350 and 450? Both have a higher CADR than the 400 but are cylindrical.
Feb 14, 2026 8:12 AM
4.8K Comments
Joined Jan 2004
exhurtFeb 14, 2026 8:12 AM
4.8K Comments

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I got one of these and they started producing an annoying hum or whine at low speeds.
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Feb 14, 2026 10:37 AM
657 Comments
Joined Sep 2020
ThriftyThread5737Feb 14, 2026 10:37 AM
657 Comments
I'll sell you one of these for $199 https://www.greenbuildingadvisor....ir-cleaner
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