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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 22, 2026 4:31 AM
918 Comments
Joined May 2013
reffmanFeb 22, 2026 4:31 AM
918 Comments
Quote from swansong119 View quoted comment :
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
Thanks for the rec.
Feb 22, 2026 11:33 AM
1.8K Comments
Joined Apr 2009
atarilynxFeb 22, 2026 11:33 AM
1.8K Comments
Personally I prefer the Mila purifiers as I like the app and interface, plus they do A great job. Sure this is good too.
Feb 22, 2026 5:18 PM
443 Comments
Joined Sep 2017
slicknewbie1Feb 22, 2026 5:18 PM
443 Comments
Nice deal
3
Feb 22, 2026 5:22 PM
918 Comments
Joined May 2013
reffmanFeb 22, 2026 5:22 PM
918 Comments
Quote from groovadelickun View quoted comment :
I purchased two of these through the years and continue to work great!
However, if u have cats, they may love to jump on them and change the settings 😉
I 3-d Printed some covers and problem solved Smilie
Thanks for the review and HU about cats!
Feb 22, 2026 5:39 PM
84 Comments
Joined Nov 2016
jayhat2004Feb 22, 2026 5:39 PM
84 Comments
Quote from YwVJZXkD View quoted comment :
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.
Cats love standing on them too
Feb 22, 2026 7:03 PM
197 Comments
Joined Jan 2021
HondaBoy619Feb 22, 2026 7:03 PM
197 Comments
How does this compare to building a custom one with a box fan and HVAC filters?
Feb 22, 2026 7:45 PM
78 Comments
Joined Nov 2025
alecmed8292Feb 22, 2026 7:45 PM
78 Comments
Breath of fresh air
1

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Feb 22, 2026 8:04 PM
214 Comments
Joined Dec 2013
UltLurkerFeb 22, 2026 8:04 PM
214 Comments
How did these compare to the stand up winix air filters?
Feb 23, 2026 1:59 AM
461 Comments
Joined Jun 2005
coach_x+Feb 23, 2026 1:59 AM
461 Comments
I made my own with a box fan run it in the basement 24/7. I could probably sell these because it uses regular house filters
Feb 23, 2026 3:48 AM
1.4K Comments
Joined Sep 2015
RyanJ7344Feb 23, 2026 3:48 AM
1.4K Comments
I also really don't understand how air filters are able to command such premium prices, (these, blueair, etc) for what is essentially a fan in an enclosure box.

Additionally, manufacturers profit from huge margins on filter sales.
Feb 23, 2026 3:50 AM
219 Comments
Joined Mar 2020
JollyHose932Feb 23, 2026 3:50 AM
219 Comments
Have this brand running 24/7 for the past 8 years. No issues . Just replace filters when the lights come on. Yes you can make your own using a box fan for cheap etc etc but your box fan does not adjust speed based on air quality this down. Box fan also looks cheap. I would put a boxfan in the basement away from my eyes but keep this in living spaces.
Feb 23, 2026 4:08 AM
49 Comments
Joined Apr 2013
NikoBFeb 23, 2026 4:08 AM
49 Comments
Recall?
Feb 23, 2026 5:56 AM
82 Comments
Joined May 2017
FirmFeb 23, 2026 5:56 AM
82 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.
Get me one too please!
1
Feb 23, 2026 8:39 AM
4.6K Comments
Joined Jan 2012
RedElmoFeb 23, 2026 8:39 AM
4.6K 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.
Dang! I need to go shop at thrift store more. I heard there can be good things to be had. But I never actually go!
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Feb 23, 2026 8:40 AM
4.6K Comments
Joined Jan 2012
RedElmoFeb 23, 2026 8:40 AM
4.6K Comments
Quote from coach_x+ View quoted comment :
I made my own with a box fan run it in the basement 24/7. I could probably sell these because it uses regular house filters
I did too lol. I had extra AC filters from a old AC system. So didn't want the filters to goto waste.

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