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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

elsenor
703Comments
80Reputation
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.
Go to Comment
YwVJZXkD
369Comments
57Reputation
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.
Go to Comment
PatrickH2067
126Comments
17Reputation
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.
Go to Comment

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.

  • The pre-filter screen can be vacuumed regularly to support ongoing maintenance and airflow.

    SensibleMeal1392darren_fsl

  • The purifier can keep running for years with filter replacements timed by indicator lights.

    JollyHose932ChukkyS

  • The purifier can clear visible dust haze in less than a day after setup.

    mremmert23

  • The unit can reduce dust and hair by capturing debris on the pre-filters while nearby surfaces stay cleaner.

    dwayned

  • Replacement filters can develop a strong chemical odor, and some users stop using the Coway because of it.

    Clint3200Fauxnoh

  • Replacement filters can be expensive, with genuine options ranging roughly from $70 on sale up to about $115 without sale.

    elnino2783

  • WiFi and app setup can be a hassle, and power outages can require a hard reset and re-adding to the app.

    BrainDoc

  • The unit can be noisy at speeds above low, and low speeds may not move much air.

    jimschoice

Common Questions (5)

AI-generated summary based on comments from the community. Updated ago

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132 Comments

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Feb 19, 2026 3:30 AM
1.4K Comments
Joined Jun 2009
NSTarFeb 19, 2026 3:30 AM
1.4K Comments
is it as good as this? I may get one if comparable
https://enviroklenz.com/product/e...-uv-model/
Feb 19, 2026 5:40 AM
942 Comments
Joined Jul 2007
fubagFeb 19, 2026 5:40 AM
942 Comments
Ehh lot of folks commenting on 3rd party filters but even wirecutter wrote : "We tested two popular third-party replacement-filter sets for the Mighty, made by Cabiclean and Durabasics, and neither gave off any noticeable odor. They performed almost identically to the genuine Coway filter in our smoke tests, so we're confident in recommending them. One caveat: Coway told us that "if a problem is identified using a third-party filter, the customer does not receive warranty service."
Feb 19, 2026 6:00 AM
1K Comments
Joined Jul 2005
psuvetteFeb 19, 2026 6:00 AM
1K Comments
Quote from Tazmania99 View quoted comment :
We've had this for two years. Very happy with this. It is sensitive. When my pet cat passes by, it automatically kicks on. When my son farts, the machine detects it right the way. In average, we replaced the filters once a year. We use this 24x7 in winter and during the summer when our AC is on. You don't use it when you have your windows open.
If it detects farts, it would run continuously for me
1
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1
Feb 19, 2026 6:20 AM
336 Comments
Joined Nov 2025
ForHassanFeb 19, 2026 6:20 AM
336 Comments
How is the ozone production on these products?
Feb 19, 2026 9:17 AM
1.1K Comments
Joined Dec 2005
jimschoiceFeb 19, 2026 9:17 AM
1.1K Comments
Quote from airj1012 View quoted comment :
Tempting price. Thinking about geting one for my downstairs, which is roughly 1,200 square feet. Or would it make sense to get two air purifiers like Winix 5520 so their aren't any dead zones. Or some other version where I could purchase two for roughly the same price. But 46% definitely has my spidysenses going off!
I bought the 400 and regret it. I should have gotten two of the smaller ones instead. The 400 is noisy on any speed above low, at which it doesn't move much air. I have a 200 in the bedroom that runs on speed 2 continuously and it collects much more dust than the 400. I have a couple of Winix as well, but they start making fan bearing noises after a while. The 5500 (first purifier I ever bought about 6 years ago) has lasted much longer than the 2 AM80's I bought at Costco. One of them got thrown out already and was replaced by the Airmega 200.
1
Feb 19, 2026 9:22 AM
1.1K Comments
Joined Dec 2005
jimschoiceFeb 19, 2026 9:22 AM
1.1K Comments
Quote from misterv1 View quoted comment :
This or blue air?
I returned 2 blue air to Costco because the awful smell from their filters was giving us headaches! They looked nice and were quiet. But both had that terrible chemical smell that didn't go away after a week.
Feb 19, 2026 10:53 AM
1.4K Comments
Joined Nov 2010
JusthathoughtFeb 19, 2026 10:53 AM
1.4K Comments

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

Get the Levoit 600s whole house WiFi unit...I spent hours (winter time and bored) researching filters and deciding on it because of filter replacement cost and effectiveness. 2 years later all three have had no issues, bought one for my sister as well.
1

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Feb 19, 2026 4:34 PM
1.4K Comments
Joined Jan 2024
CoolKestrel1061Feb 19, 2026 4:34 PM
1.4K Comments
If you're going to go expensive, go Austin Air. Hepa + charcoal filters. Best on the market IMHO. filters last 5 years.
Feb 19, 2026 5:32 PM
443 Comments
Joined Sep 2017
slicknewbie1Feb 19, 2026 5:32 PM
443 Comments
Nice deal
Feb 19, 2026 6:05 PM
44 Comments
Joined Oct 2018
FauxnohFeb 19, 2026 6:05 PM
44 Comments
Quote from Clint3200 View quoted comment :
All the replacement filters for these (even OEM) stink like chemicals.I gave up and got rid of the Coway and went with another brand.Check the reviews. Many people notice the terrible smell of the replacements.
We received ours yesterday and I can attest, it does smell like chemicals. We're currently running it in a closed room with the window open.
Feb 19, 2026 8:25 PM
1.6K Comments
Joined Dec 2007
VMaskedFeb 19, 2026 8:25 PM
1.6K Comments
Quote from ForHassan View quoted comment :
How is the ozone production on these products?
no ionization
Feb 19, 2026 8:27 PM
1.6K Comments
Joined Dec 2007
VMaskedFeb 19, 2026 8:27 PM
1.6K Comments
Quote from CoolKestrel1061 View quoted comment :
If you're going to go expensive, go Austin Air. Hepa + charcoal filters. Best on the market IMHO. filters last 5 years.
i was looking at one but its heavy as hell, loud and not power efficient. Debating if its really that good taking out VOCS
Feb 19, 2026 8:29 PM
1.6K Comments
Joined Dec 2007
VMaskedFeb 19, 2026 8:29 PM
1.6K Comments
Quote from g0dM@n View quoted comment :
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.
I have a winix c535 is this replacement filter good for it because some reviews on amazon say it's too thick so you can't close the machine... have you had that problem? Also is there any chemical smell from the replacement filtered? c
Feb 19, 2026 10:23 PM
150 Comments
Joined Jul 2013
cpham4Feb 19, 2026 10:23 PM
150 Comments
How does this compare to the Winix air purifiers from Costco?

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Feb 20, 2026 1:06 AM
6.3K Comments
Joined Jul 2008
hanabieFeb 20, 2026 1:06 AM
6.3K Comments
Quote from CoolKestrel1061 View quoted comment :
If you're going to go expensive, go Austin Air. Hepa + charcoal filters. Best on the market IMHO. filters last 5 years.
So you only need to replace filters every 5 years???!!

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