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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 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
464 Comments
Joined Mar 2015
jrwhite82Feb 18, 2026 2:30 PM
464 Comments
Would this work in a 3 level townhouse (1200sq ft) with open staircase?
1
Feb 18, 2026 3:54 PM
1.3K Comments
Joined Mar 2012
AtTheLeftThereFeb 18, 2026 3:54 PM
1.3K Comments
Paying even $350 for an air purifier is insane.
3
Feb 18, 2026 4:01 PM
386 Comments
Joined Nov 2015
EuphoriaFalconsFeb 18, 2026 4:01 PM
386 Comments
How is this compared to AustinAir (except price)
1
Feb 18, 2026 4:01 PM
386 Comments
Joined Nov 2015
EuphoriaFalconsFeb 18, 2026 4:01 PM
386 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
386 Comments
Joined Nov 2015
EuphoriaFalconsFeb 18, 2026 4:05 PM
386 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
446 Comments
Joined Jun 2012
ponic
Pro
Feb 18, 2026 4:20 PM
446 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
436 Comments
Joined Nov 2010
Strider007Feb 18, 2026 7:09 PM
436 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
254 Comments
Joined Dec 2008
anutaFeb 18, 2026 7:22 PM
254 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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