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frontpagephoinix | Staff posted Feb 25, 2026 08:04 AM
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frontpagephoinix | Staff posted Feb 25, 2026 08:04 AM

Coway Airmega 400 HEPA Filter Smart Air Purifier (Graphite)

+ Free S/H

$349

$500

30% off
Amazon
19 Comments 10,461 Views
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Deal Details
Amazon has Coway Airmega 400 HEPA Filter Smart Air Purifier (Graphite) on sale for $349. Shipping is free.

Coway also has Coway Airmega 400 HEPA Filter Smart Air Purifier (Graphite or White) on sale for $349. Shipping is free.

Thanks to Deal Hunter phoinix for finding 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 johnny_miller | Staff
  • Price Research:
    • This offer matches a recent +294 Frontpage Deal in White color at Amazon.
    • Our research indicates this offer is $230 lower (40% savings) than the next best price from a reputable merchant at the time of this post.
  • About this Store:

Original Post

Written by phoinix | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has Coway Airmega 400 HEPA Filter Smart Air Purifier (Graphite) on sale for $349. Shipping is free.

Coway also has Coway Airmega 400 HEPA Filter Smart Air Purifier (Graphite or White) on sale for $349. Shipping is free.

Thanks to Deal Hunter phoinix for finding 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 johnny_miller | Staff
  • Price Research:
    • This offer matches a recent +294 Frontpage Deal in White color at Amazon.
    • Our research indicates this offer is $230 lower (40% savings) than the next best price from a reputable merchant at the time of this post.
  • About this Store:

Original Post

Written by phoinix | Staff

Community Voting

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+42
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Price Intelligence

Model: Coway Airmega 400 Green True HEPA Air Purifier Graphite

Deal History 

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Sort: Lowest to Highest | Last Updated 3/17/2026, 01:54 PM
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Amazon$649.99

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Top Comments

TravisB7539
687 Posts
84 Reputation
For nearly double the money? Not a chance.
billiauj
81 Posts
130 Reputation
Purchased this unit 6 years ago and still running strong. I usually replace the filter once a year. It's crazy how much dust this thing collects in the pre filter screen. Really is no need for a smart version, it just sucks in dust. What else is there to know from your phone ....lol

19 Comments

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Feb 25, 2026 04:14 PM
15,446 Posts
Joined Jan 2010
Ride_The_SkyFeb 25, 2026 04:14 PM
15,446 Posts
Damn I just bought the white one, didn't arrive yet but I think they are shipping it. I wanted the black one. I will try to cancel and get this. Looks much better.
2
Feb 25, 2026 04:49 PM
186 Posts
Joined Nov 2015
darren_fslFeb 25, 2026 04:49 PM
186 Posts
Best deal in a while on the graphite version. Usually it seems they discount the white versions.
Feb 25, 2026 08:45 PM
79 Posts
Joined Sep 2014
RandomBot369Feb 25, 2026 08:45 PM
79 Posts
This is technically not the smart version. This deal is for the non-s version.
1
Feb 25, 2026 09:58 PM
6 Posts
Joined May 2025

This comment has been rated as unhelpful by Slickdeals users.

Feb 25, 2026 10:19 PM
1,866 Posts
Joined Apr 2009
mastermind85Feb 25, 2026 10:19 PM
1,866 Posts
I recommend the smart version (400S) due to the ability to link it to home assistant and other air quality monitors, etc.
3
Feb 26, 2026 06:48 PM
687 Posts
Joined Jan 2019
TravisB7539Feb 26, 2026 06:48 PM
687 Posts
Quote from mastermind85 :
I recommend the smart version (400S) due to the ability to link it to home assistant and other air quality monitors, etc.
For nearly double the money? Not a chance.
1
Feb 27, 2026 02:36 AM
81 Posts
Joined Dec 2011
billiaujFeb 27, 2026 02:36 AM
81 Posts

Our community has rated this post as helpful. If you agree, why not thank billiauj

Purchased this unit 6 years ago and still running strong. I usually replace the filter once a year. It's crazy how much dust this thing collects in the pre filter screen. Really is no need for a smart version, it just sucks in dust. What else is there to know from your phone ....lol
1

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Feb 27, 2026 04:00 AM
2,957 Posts
Joined Aug 2011
smacky00Feb 27, 2026 04:00 AM
2,957 Posts
Quote from billiauj :
Purchased this unit 6 years ago and still running strong. I usually replace the filter once a year. It's crazy how much dust this thing collects in the pre filter screen. Really is no need for a smart version, it just sucks in dust. What else is there to know from your phone ....lol
Agreed. I've had mine since BF of 2019. Pre filter gets a lot of the stuff in my small room.

You do need to run this at medium speed to get a lot of the benefits. Leaving it on auto doesn't seem to pick up as much dust as medium does. I think I read on Wirecutter that for any purifier, it needs to run at a certain CFM to really be effective and running most purifiers on something lower than their respective medium setting doesn't do a whole lot of good.
1
Feb 27, 2026 04:14 AM
111 Posts
Joined Feb 2018
WittyPanther722Feb 27, 2026 04:14 AM
111 Posts
Quote from billiauj :
Purchased this unit 6 years ago and still running strong. I usually replace the filter once a year. It's crazy how much dust this thing collects in the pre filter screen. Really is no need for a smart version, it just sucks in dust. What else is there to know from your phone ....lol
Dust falls to ground. Purifiers aren't for dust, they are for airborne particles
1
1
Feb 27, 2026 06:24 AM
120 Posts
Joined Dec 2018
TimsBargainsFeb 27, 2026 06:24 AM
120 Posts
I have two of the graphite non smart. I don't mind the lack of smart connection features. The air quality color circle is helpful at a glance. 2 sets of hepa filters per unit. Doors are magnetic which is nice. Its very quiet on med speed.
Feb 27, 2026 06:51 AM
2,060 Posts
Joined Nov 2016
androsskingFeb 27, 2026 06:51 AM
2,060 Posts
I have a smart version because it was cheaper at the time of purchase. I would recommend buying whatever model is cheaper. Their app is garbage. If you want to monitor your air quality, better to get a dedicated monitor
Feb 27, 2026 09:54 AM
134 Posts
Joined Mar 2010
VastoFeb 27, 2026 09:54 AM
134 Posts
Quote from mastermind85 :
I recommend the smart version (400S) due to the ability to link it to home assistant and other air quality monitors, etc.
When did you set that up? They replaced their app and now all the reviews say it is garbage and can't set basic things like a schedule.
Feb 27, 2026 05:14 PM
1,866 Posts
Joined Apr 2009
mastermind85Feb 27, 2026 05:14 PM
1,866 Posts
Quote from TravisB7539 :
For nearly double the money? Not a chance.
It's on sale often for $400, so $50 more.
Feb 27, 2026 05:15 PM
1,866 Posts
Joined Apr 2009
mastermind85Feb 27, 2026 05:15 PM
1,866 Posts
Quote from Vasto :
When did you set that up? They replaced their app and now all the reviews say it is garbage and can't set basic things like a schedule.
I don't use their app. I have home assistant setup using their api so it automates everything on the backend.

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Feb 27, 2026 05:16 PM
1,866 Posts
Joined Apr 2009
mastermind85Feb 27, 2026 05:16 PM
1,866 Posts
Quote from androssking :
I have a smart version because it was cheaper at the time of purchase. I would recommend buying whatever model is cheaper. Their app is garbage. If you want to monitor your air quality, better to get a dedicated monitor
This is why I like my smart version that was $50 more. I have an Apollo air monitor and my Airmega both on my home assistant, and I can set triggers based on my Apollo monitor instead of just the local sensor.

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