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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

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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 26, 2026 3:00 PM
424 Comments
Joined Oct 2004
EnikeFeb 26, 2026 3:00 PM
424 Comments
Thanks!
1
Feb 26, 2026 3:28 PM
49 Comments
Joined Aug 2008
azzmaticFeb 26, 2026 3:28 PM
49 Comments
Anyone have this? How does it compare to Winix for cleaning and filter costs?
Feb 27, 2026 12:51 AM
1.4K Comments
Joined Nov 2010
JusthathoughtFeb 27, 2026 12:51 AM
1.4K Comments
SD must be making big $$$ to keep this still going forever
Feb 27, 2026 9:47 PM
117 Comments
Joined Jun 2013
GJGGGGGFeb 27, 2026 9:47 PM
117 Comments
This is legit. I have so many air filters and this one has impressed me right away. I don't credit the refill cost - it works
Feb 28, 2026 1:53 AM
54 Comments
Joined Jun 2019
CoolDesk174Feb 28, 2026 1:53 AM
54 Comments
I have my furnaces in the basement of a 100+ year old house. Dusty, rocks, a lot of sut all over. Would this be a good option to put in the basement to improve air that is sent throughout the house?
Mar 1, 2026 4:50 AM
231 Comments
Joined Nov 2014
bmcdev16Mar 1, 2026 4:50 AM
231 Comments
Better than Winix?
1
Mar 1, 2026 5:37 AM
144 Comments
Joined May 2012
dwaynedMar 1, 2026 5:37 AM
144 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
Incredible difference. The trick is to set a schedule if you can. I have the 400S, so it has a smartphone app. Right after we leave the house in the morning both if mine run at the highest setting for ½ hr. I find incredible amounts of dust and hair on the cleanable and reusable pre-filters, and the floor beneath itis also dusty but my surfaces like tables and windowsills are not at all dusty!

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Mar 1, 2026 9:06 PM
15 Comments
Joined Nov 2011
dmcmeekinMar 1, 2026 9:06 PM
15 Comments
How noisy is this thing if it sits next to my living room TV?
Mar 1, 2026 11:39 PM
23 Comments
Joined Apr 2011
mremmert23Mar 1, 2026 11:39 PM
23 Comments
Just received mine a few days ago. This thing is amazing. We recently moved into a new apartment and there was this haze visually in the air from the dust and this cleaned it up in less then a day! Would highly recommend.
Mar 2, 2026 12:24 AM
1.2K Comments
Joined Feb 2007
cheshirecatMar 2, 2026 12:24 AM
1.2K Comments
Does the filter smell? A few people in this thread complained of chemical smell. Did they get a lemon, or is it actually common?
Mar 2, 2026 12:43 AM
23 Comments
Joined Apr 2011
mremmert23Mar 2, 2026 12:43 AM
23 Comments
Quote from cheshirecat View quoted comment :
Does the filter smell? A few people in this thread complained of chemical smell. Did they get a lemon, or is it actually common?
Mine had a new manufacturing smell but was gone after a day
Mar 2, 2026 1:01 AM
61 Comments
Joined Jul 2024
FeistyPocket719Mar 2, 2026 1:01 AM
61 Comments
Love this thing. We keep it in the bedroom and it is silent enough to sleep next to. Have had it for about 4 years and it's still going strong. No fan bearing noise even after this long of it continuously running. Have it on auto during the day and low at night.

My only gripe is that it beeps multiple times at the schedule change and you can't silence it. We just make it 9pm and 9am to ensure we're awake when it beeps multiple times

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