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phoinix 90.4K 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
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

Community Voting

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Top Comments

Community Reviews

The Coway Airmega 400 is a large, smart HEPA air purifier that does a strong job clearing dust, odors, and visible haze, with auto mode and scheduling that can keep it running quietly in living spaces or bedrooms. Long-term reports are excellent, with units still working well after years of near-constant use, and the washable pre-filter helps stretch maintenance. The main drawbacks are the high cost of replacement filters, especially because the unit uses two, plus occasional complaints about chemical smells, noise at higher speeds, and app or WiFi hassles. It is a capable purifier if you can live with the upkeep and size.

  • Owners who plan to keep a purifier running continuously for years, because it has stayed reliable through 4 to 10 years of near-constant use.

  • Shoppers comfortable using third-party filters, because compatible aftermarket replacements can work well and keep annual upkeep lower.

  • People managing dust, pet hair, or visible haze in a living space, because scheduled high-speed runs and auto detection pull a lot of debris into the pre-filter.

  • People who want a purifier with automatic air-quality sensing, because it adjusts speed on its own and reacts quickly to odors and pets.

  • Households wanting a bedroom purifier that can run quietly overnight, because it stays silent enough for sleep and can be set to low at night.

  • People sensitive to chemical odors, because replacement filters and even the unit itself can smell strongly on arrival.

  • Apartment dwellers or multi-floor homes expecting one unit to cover everything, because it does not do well between floors and enclosed spaces.

  • Families with small children or cats near the controls, because there is no child lock and pets can press buttons or change settings.

  • Shoppers who want strong airflow without noise, because it gets loud above low speed and can produce a hum or whine.

  • Buyers who need easy WiFi control after outages, because the app setup can be finicky and may require a hard reset to reconnect.

Common Questions (5)

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132 Comments

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Feb 18, 2026 5:05 AM
5.8K Comments
Joined Jul 2006
g0dM@nFeb 18, 2026 5:05 AM
5.8K Comments
Quote from Impulse_shopper View quoted comment :
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.
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.
Feb 18, 2026 2:30 PM
465 Comments
Joined Mar 2015
jrwhite82Feb 18, 2026 2:30 PM
465 Comments
Would this work in a 3 level townhouse (1200sq ft) with open staircase?
1
Feb 18, 2026 3:54 PM
1.4K Comments
Joined Mar 2012
AtTheLeftThereFeb 18, 2026 3:54 PM
1.4K Comments
Paying even $350 for an air purifier is insane.
3
Feb 18, 2026 4:01 PM
389 Comments
Joined Nov 2015
EuphoriaFalconsFeb 18, 2026 4:01 PM
389 Comments
How is this compared to AustinAir (except price)
1
Feb 18, 2026 4:01 PM
389 Comments
Joined Nov 2015
EuphoriaFalconsFeb 18, 2026 4:01 PM
389 Comments
Quote from AtTheLeftThere View quoted comment :
Paying even $350 for an air purifier is insane.
I agree, look at austin air.. problem is with mold and toxic stuff in homes (from paints etc) , these are worth
Feb 18, 2026 4:05 PM
389 Comments
Joined Nov 2015
EuphoriaFalconsFeb 18, 2026 4:05 PM
389 Comments
Quote from jrwhite82 View quoted comment :
Would this work in a 3 level townhouse (1200sq ft) with open staircase?
it might but ideally its recommended one for every floor
Feb 18, 2026 4:06 PM
48 Comments
Joined Dec 2023
MagentaSink1187Feb 18, 2026 4:06 PM
48 Comments
Quote from AtTheLeftThere View quoted comment :
Paying even $350 for an air purifier is insane.
small price to pay for your long-term health, don't you think?

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Pro
Feb 18, 2026 4:20 PM
449 Comments
Joined Jun 2012
ponic
Pro
Feb 18, 2026 4:20 PM
449 Comments
Quote from jrwhite82 View quoted comment :
Would this work in a 3 level townhouse (1200sq ft) with open staircase?
Probably not satisfactorily. I would consider smaller units for each floor.
1
Feb 18, 2026 5:04 PM
48 Comments
Joined Dec 2023
MagentaSink1187Feb 18, 2026 5:04 PM
48 Comments
Quote from ponic View quoted comment :
Probably not satisfactorily. I would consider smaller units for each floor.
Doesn't do well between floors and enclosed spaces.
Honestly, if you have big rooms throughout your floors, get multiple of these devices.
Feb 18, 2026 7:09 PM
439 Comments
Joined Nov 2010
Strider007Feb 18, 2026 7:09 PM
439 Comments
Good deal!
Feb 18, 2026 7:15 PM
1.5K Comments
Joined Nov 2013
NickB3364Feb 18, 2026 7:15 PM
1.5K Comments
This is the best air purifier I've ever owned. I've had one running almost 24/7 for the last 5 years, and the only time I've had an issue with it was when a toddler decided to put a bunch of Lego on top of it and a handful fell through. Easy enough to clean out though, and it was back in service pretty fast.

Would not hesitate to buy one of these again if I needed a 2nd.
2
Feb 18, 2026 7:22 PM
271 Comments
Joined Dec 2008
anutaFeb 18, 2026 7:22 PM
271 Comments
Luxury item, not for everyone unfortunately!
3
Feb 18, 2026 8:00 PM
209 Comments
Joined Aug 2020
Kennasaurus87Feb 18, 2026 8:00 PM
209 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.
I'm jealous!
1
Feb 18, 2026 8:59 PM
1.6K Comments
Joined Sep 2017
slickdealgbFeb 18, 2026 8:59 PM
1.6K Comments
Quote from anuta View quoted comment :
Luxury item, not for everyone unfortunately!
Tough being poor.
3
4

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Feb 18, 2026 11:27 PM
989 Comments
Joined Jul 2010
misterv1Feb 18, 2026 11:27 PM
989 Comments
This or blue air?

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