Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
Heads up, this deal has expired. Want to create a deal alert for this item?
expiredphoinix | Staff posted Feb 13, 2026 08:05 AM
  1. Deal Image
Item 1 of 3
  1. Deal Image
  2. Deal Image
  3. Deal Image
Item 1 of 3
expiredphoinix | Staff posted Feb 13, 2026 08:05 AM

Coway Airmega 400 True HEPA Smart Air Purifier (White)

+ Free Shipping

$349

$649

46% off
Amazon
132 Comments 78,686 Views
Visit Amazon
Good Deal
Save
Share
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 Product:
    • Rated 4.5 out of 5 stars at Amazon based on over 6,470 customer reviews.
  • 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
Product Info
Community Notes
About the Poster
Deal Details
Product Info
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 Product:
    • Rated 4.5 out of 5 stars at Amazon based on over 6,470 customer reviews.
  • 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 Voting

Deal Score
+327
Good Deal
Visit Amazon

Price Intelligence

Model: Coway Airmega 400 True HEPA Air Purifier with 1560 sq. ft. Coverage

Deal History 

Sale Price
Slickdeal
  • $NaN
  • Today

Leave a Comment

Unregistered (You)

Top Comments

YwVJZXkD
356 Posts
57 Reputation
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.
PatrickH2067
113 Posts
17 Reputation
The aftermarkets aren't as good. No doubt about it. Less air flow because they have fewer pleats. I counted seven less pleats one time, and five less another time. In large rooms, or especially a whole house, this makes a difference. You will see dust in the air next to windows when you get further away from the filter.
This last time I spent the money on Coway filters and can say I am happier. ultimately worth the price. I can tell the air is 'lighter' when I change the filters. More so than when I'd change out to aftermarket. The carbon also lasts a LOT longer. There is a smell in the air when the carbon stops working. It's distinct. The carbon in the Coways easily last twice as long. But this isn't a deal breaker. As the carbon in the Coways don't last as long as the HEPA part either. You can give them a good shake, to extend the life of the carbon. Doing so introduces new cracks and crevices within the pieces of carbon for the air to filter through. Be sure the vacuum it first. Shake with the carbon part of the filter pointed down. And vacuum again afterwards. Because you will get carbon dust, it's just little pieces of charcoal, all in your HEPA, reducing the lifespan.
darren_fsl
188 Posts
34 Reputation
I have two of these 400 series (along with a Pro X and (4) 200Ms running all the time in my house (high air pollution where we live), and have no problem using non-OEM filters as replacements. They're fine. I seriously doubt that Coway makes their own HEPA filters; so they're likely sourcing them from China, too. Carbon pellets/filters don't last as long as the HEPA filters anyway, so you're only removing VOCs and smells for the first part of your filter life anyway. Like others have noted, just clean your filter screens often, vacuum or dust off the HEPA filter on the carbon side, and you'll get 9mos to a year.

132 Comments

Sign up for a Slickdeals account to remove this ad.

Feb 20, 2026 03:43 AM
218 Posts
Joined Jun 2019
_K_VFeb 20, 2026 03:43 AM
218 Posts
Thanks OP
4
Feb 20, 2026 04:03 AM
131 Posts
Joined May 2014
nixnacFeb 20, 2026 04:03 AM
131 Posts
Decent price
3
Feb 20, 2026 03:01 PM
96 Posts
Joined May 2015
nottaFeb 20, 2026 03:01 PM
96 Posts
Quote from exhurt :
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 05:23 PM
9 Posts
Joined Aug 2023
KaranThakkarFeb 20, 2026 05:23 PM
9 Posts
Great product
3
Pro
Deal Editor
Feb 20, 2026 08:05 PM
15,716 Posts
Joined May 2008
powerfuldopplerFeb 20, 2026 08:05 PM
Pro
Deal Editor
15,716 Posts
Update: This very popular deal is still available.
1
Feb 20, 2026 10:45 PM
280 Posts
Joined May 2008
swstatesFeb 20, 2026 10:45 PM
280 Posts
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 Posts
Joined Nov 2025
alecmed8292Feb 21, 2026 12:35 AM
78 Posts
No issues
2

Sign up for a Slickdeals account to remove this ad.

Feb 21, 2026 03:00 PM
64 Posts
Joined Mar 2011
KewtzFeb 21, 2026 03:00 PM
64 Posts
Quote from YwVJZXkD :
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
Pro
Expert
This user is an Expert in Computers
Feb 21, 2026 04:07 PM
1,839 Posts
Joined Aug 2009
SDkimchi
Pro
Expert
This user is an Expert in Computers
Feb 21, 2026 04:07 PM
1,839 Posts
Thanks OP!
Feb 21, 2026 07:54 PM
287 Posts
Joined Feb 2010
groovadelickunFeb 21, 2026 07:54 PM
287 Posts
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
Feb 21, 2026 09:47 PM
1,747 Posts
Joined Dec 2004
Hybrid_TheoryFeb 21, 2026 09:47 PM
1,747 Posts
This or Winix from Costco
Feb 21, 2026 10:59 PM
7,187 Posts
Joined Mar 2008
ready2rumbleFeb 21, 2026 10:59 PM
7,187 Posts
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 01:00 AM
433 Posts
Joined Dec 2015
BeniskickbuttFeb 22, 2026 01:00 AM
433 Posts
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 01:31 AM
2,932 Posts
Joined May 2018
TimlessFeb 22, 2026 01:31 AM
2,932 Posts
Quote from Beniskickbutt :
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.

Sign up for a Slickdeals account to remove this ad.

Feb 22, 2026 03:47 AM
13 Posts
Joined May 2021
alirzayevFeb 22, 2026 03:47 AM
13 Posts
I was actually looking for an air purifier for home. I'll go with this model, hope I won't regret it

Leave a Comment

Unregistered (You)

Related Searches

Free ShippingHome & Home ImprovementSmall AppliancesAir Purifiers, Humidifiers & DehumidifiersCowayAmazon

Popular Deals

See All
Found by minntwins
Apr 02, 2026 11:55 AM
Forum Thread
Patagonia Women's Diamond Quilted Bomber Jacket (Basin Green) $74.98 + Free Shipping$75$199
62% off
1
Found by babgaly
Today 02:56 AM
Forum Thread
52-in-1 Wesdut Magnetic Precision Screwdriver Set (Blue) $6.99 + Free Shipping w/ Prime or on $35+$6.99$9.99
30% off
0
Found by JohnDubya
Yesterday 03:15 AM
Forum Thread
$59.99: Adidas Adizero ZG Spikeless Golf Shoes, Footwear White/Lucid Red/Core Black, Size 13 ONLY$60$180
66% off
3
Found by Dr.W
Today 04:06 AM
Forum Thread
Acer Vero 514 Chromebook (Cert. Refurb): 14" FHD IPS 300-nits, i3-1215U, 8GB LPDDR4, 128GB SSD $167.39$167$399
58% off
2
Found by phoinix
Apr 02, 2026 05:05 PM
Forum Thread
$15.29 | Gilmour Pro Twist Hose Nozzle at Amazon$15$22
31% off
6

Trending Deals

See All
Found by DealzRGood4U
Yesterday 10:29 PM
Forum Thread
2-Pack (22.9 oz) Nutella Chocolate Hazelnut Spread $7.29$7.29$15
51% off
5
Found by hocuspocusblade
Yesterday 10:33 PM
Forum Thread
Amazon Grocery, Roasted Peanuts, Roasted & Salted, 44 Oz (Previously Happy Belly, Packaging May Vary)~$4.39 After Coupon & S&S @ Amazon~Buy 4 & Save More!$4.39
6
Found by phoinix
Today 05:01 AM
Forum Thread
$16.09 | Amazon Fire TV Stick 4K (2nd Gen) (2023) at Woot!$16$50
68% off
0
Found by babgaly
Today 02:44 AM
Forum Thread
18.9"D x 27.5"W x 32"H ODK Study Desk w/ Storage & Monitor Stand (Pink) $39.99 + Free Shipping$40$70
42% off
0
Found by katicj
Today 01:01 AM
Forum Thread
Gwar - Scumdogs Xxx Live - Vinyl $14.41$14$31
54% off
1