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frontpagephoinix | Staff posted Today 08:05 AM
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frontpagephoinix | Staff posted Today 08:05 AM

Coway Airmega 400 True HEPA Smart Air Purifier (White)

+ Free Shipping

$349

$649

46% off
Amazon
19 Comments 4,031 Views
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Deal Details
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 citan359 | 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
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 citan359 | 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
+28
Good Deal
Get Deal at Amazon

Price Intelligence

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

Deal History 

Sale Price
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$349
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Sort: Lowest to Highest | Last Updated 2/13/2026, 01:28 PM
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19 Comments

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Today 02:41 PM
401 Posts
Joined Nov 2003
ryewoodsToday 02:41 PM
401 Posts
I have two of these in my house, and they are amazing air purifiers. Replacement filters last a year or longer, but are expensive if you don't get them on sale.
Last edited by ryewoods February 13, 2026 at 07:43 AM.
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This user is an Expert in Home & Home Improvement
Today 02:54 PM
17,346 Posts
Joined Jul 2008
gabe23111Today 02:54 PM
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This user is an Expert in Home & Home Improvement
17,346 Posts
Quote from ryewoods :
I have two of these in my house, and they are amazing air purifiers. Replacement filters last a year or longer, but are expensive if you don't get them on sale.
Have you ever tried aftermarket filters? I'm overdue to replace my filters and tempted to get aftermarket as it's less than a 3rd of the price right now vs the genuine. I noticed on the genuine filter [amazon.com] there are a nice handful of recent reviews complaining about a weird odor.
Today 03:00 PM
1 Posts
Joined Feb 2026
SensibleMeal1392Today 03:00 PM
1 Posts
I also have two in my house one for bedroom, one for main room and work well at circulating the air once an hour as advertised. filters are expensive. I vac the pre-filter screen but HEPA I replace twice a year. Keep in mind air sucks into both sides so there are 2x the filters to buy, they come in a pack of 2.
Today 03:04 PM
70 Posts
Joined Jan 2013
jeffboyardeeToday 03:04 PM
70 Posts
Quote from gabe23111 :
Have you ever tried aftermarket filters? I'm overdue to replace my filters and tempted to get aftermarket as it's less than a 3rd of the price right now vs the genuine. I noticed on the genuine filter [amazon.com] there are a nice handful of recent reviews complaining about a weird odor.
I have one and use aftermarket filters for some cost savings. I can say I don't notice a difference so it works for me
Today 03:27 PM
3,694 Posts
Joined Oct 2003
elnino2783Today 03:27 PM
3,694 Posts
As everyone says, the replacement filter cost is expensive. I've bought the official filters for as low as $70, but they're as mush as $115 if not on sale. That's the cost total for the pair of filters you have to replace.

Reviews for the offbrand types tend to notice differences in weight that indicate there's less carbon in the carbon filter, or other differences
Today 03:39 PM
702 Posts
Joined Dec 2010
elsenorToday 03:39 PM
702 Posts
We've had an airmega 400 for about 6 years and it still works great. We also use the aftermarket replacement filters and can't tell a difference (FWIW we don't buy the cheapest and are from some "filter" company on Amz). Even if the OEM are better and have more carbon, I don't care when the non-OEM are half the cost. When I clean the filter screens, I also vacuum the outfacing part of the filter where the little bits of carbon are.
Pro
Today 03:44 PM
705 Posts
Joined Oct 2007
scubahead
Pro
Today 03:44 PM
705 Posts
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.

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Today 03:45 PM
21 Posts
Joined Jan 2015
PhilG9974Today 03:45 PM
21 Posts
How much of a difference do these make as far as dust? I'm in a very dusty house
Today 03:54 PM
28 Posts
Joined Oct 2013
tntvuToday 03:54 PM
28 Posts
Quote from ryewoods :
I have two of these in my house, and they are amazing air purifiers. Replacement filters last a year or longer, but are expensive if you don't get them on sale.
How often do you run them?
Today 04:04 PM
178 Posts
Joined Nov 2015
darren_fslToday 04:04 PM
178 Posts
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.
Today 04:05 PM
354 Posts
Joined Oct 2006
YwVJZXkDToday 04:05 PM
354 Posts
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.
2
Today 04:19 PM
121 Posts
Joined Feb 2011
phatsk807Today 04:19 PM
121 Posts
Quote from darren_fsl :
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.
Keep in mind there are multiple versions of the Airmega that look just like this. They aren't all $650 MSRP. I have a 300 series that works well, but it looks almost the exact same as the 400.
Today 04:19 PM
684 Posts
Joined May 2008
wiebel03Today 04:19 PM
684 Posts
Quote from PhilG9974 :
How much of a difference do these make as far as dust? I'm in a very dusty house
It'd significantly reduce it, but you'll have to change the filters a lot more than the recommended amount
Today 04:29 PM
178 Posts
Joined Nov 2015
darren_fslToday 04:29 PM
178 Posts
Quote from PhilG9974 :
How much of a difference do these make as far as dust? I'm in a very dusty house
It will make a big difference if 1.) you remember that the dust must be airborne, and 2.) you have reasonable expectations for it's reach into bedrooms or different floors. You'll probably want to start off cleaning the prefilter every two weeks. If you manually dust your house, generating a lot of airborne dust in the process, this unit will help capture the fine particles that otherwise just settle backdown eventually. It's made a big difference in our allergies. But we still have to vacuum and dust. These things are expensive, no doubt. But they do work.

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Today 04:42 PM
908 Posts
Joined Sep 2013
chrisaf69Today 04:42 PM
908 Posts
Quote from elsenor :
We've had an airmega 400 for about 6 years and it still works great. We also use the aftermarket replacement filters and can't tell a difference (FWIW we don't buy the cheapest and are from some "filter" company on Amz). Even if the OEM are better and have more carbon, I don't care when the non-OEM are half the cost. When I clean the filter screens, I also vacuum the outfacing part of the filter where the little bits of carbon are.
Do you mind sharing a link to the filters you get?

I purchased this, and like my smaller coway iPod-looking-units for the bedrooms will get non-oem filters, but want decent ones even if they aren't the cheapest.

Thanks!

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