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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 20, 2026 3:43 AM
309 Comments
Joined Jun 2019
_K_VFeb 20, 2026 3:43 AM
309 Comments
Thanks OP
4
Feb 20, 2026 4:03 AM
254 Comments
Joined May 2014
nixnacFeb 20, 2026 4:03 AM
254 Comments
Decent price
3
Feb 20, 2026 3:01 PM
103 Comments
Joined May 2015
nottaFeb 20, 2026 3:01 PM
103 Comments
Quote from exhurt View quoted comment :
I got one of these and they started producing an annoying hum or whine at low speeds.
Can make a smaller version by attaching a 6" thick MERV-13 HVAC filter to the back of a box fan.
Feb 20, 2026 5:23 PM
9 Comments
Joined Aug 2023
KaranThakkarFeb 20, 2026 5:23 PM
9 Comments
Great product
3
Pro
Deal Editor
Feb 20, 2026 8:05 PM
18.8K Comments
Joined May 2008
powerfuldopplerFeb 20, 2026 8:05 PM
Pro
Deal Editor
18.8K Comments
Update: This very popular deal is still available.
1
Feb 20, 2026 10:45 PM
482 Comments
Joined May 2008
swstatesFeb 20, 2026 10:45 PM
482 Comments
Going to give this one a try. This will be my first air purifier but my house needs one.
1
Feb 21, 2026 12:35 AM
78 Comments
Joined Nov 2025
alecmed8292Feb 21, 2026 12:35 AM
78 Comments
No issues
2

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Feb 21, 2026 3:00 PM
67 Comments
Joined Mar 2011
KewtzFeb 21, 2026 3:00 PM
67 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.
A temporary problem in the grand scheme of things.
2
Expert
This user is an Expert in Computers
Feb 21, 2026 4:07 PM
1.8K Comments
Joined Aug 2009
SDkimchi
Expert
This user is an Expert in Computers
Feb 21, 2026 4:07 PM
1.8K Comments
Thanks OP!
Feb 21, 2026 7:54 PM
389 Comments
Joined Feb 2010
groovadelickunFeb 21, 2026 7:54 PM
389 Comments
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
Pro
Feb 21, 2026 9:47 PM
1.8K Comments
Joined Dec 2004
Hybrid_Theory
Pro
Feb 21, 2026 9:47 PM
1.8K Comments
This or Winix from Costco
Feb 21, 2026 10:59 PM
7.4K Comments
Joined Mar 2008
ready2rumbleFeb 21, 2026 10:59 PM
7.4K Comments
I've used this brand in the past. Great stuff, and filters are inexpensive since there are generics all over the place.
Feb 22, 2026 1:00 AM
590 Comments
Joined Dec 2015
BeniskickbuttFeb 22, 2026 1:00 AM
590 Comments
Are these any better than doing that filter box that was popular during covid? I have a simple box fan with filters in my basement and it seems to keep the air "fresh" as much as I can tell. $350 seems.. a hefty price
Feb 22, 2026 1:31 AM
3.3K Comments
Joined May 2018
TimlessFeb 22, 2026 1:31 AM
3.3K Comments
Quote from Beniskickbutt View quoted comment :
Are these any better than doing that filter box that was popular during covid? I have a simple box fan with filters in my basement and it seems to keep the air "fresh" as much as I can tell. $350 seems.. a hefty price
For making clean air, it's about the same. But this looks better and is quieter and has an internal air particle sensor.

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Feb 22, 2026 3:47 AM
13 Comments
Joined May 2021
alirzayevFeb 22, 2026 3:47 AM
13 Comments
I was actually looking for an air purifier for home. I'll go with this model, hope I won't regret it

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