Coway Airmega 300 Smart HEPA Air Purifier (White)

hoxuantu

Apr 10, 2026 4:09 AM

671 Comments

Joined Nov 2014

hoxuantuApr 10, 2026 4:09 AM

671 Comments

Buy one Airmega 300 or two Airmega 200? (assuming same price)

mass422

Apr 10, 2026 4:09 AM

101 Comments

Joined Aug 2013

mass422Apr 10, 2026 4:09 AM

101 Comments

I have this exact unit and it has been nothing short of terrific. I bought it at $300. Great deal.

1

mrbugglez

Apr 10, 2026 4:55 AM

97 Comments

Joined Dec 2016

mrbugglezApr 10, 2026 4:55 AM

97 Comments

this is a great deal but the filters are so expensive to replace and they never go on sale

2

VIPgenesis

Apr 10, 2026 10:16 AM

60 Comments

Joined Oct 2017

VIPgenesisApr 10, 2026 10:16 AM

60 Comments

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

Quote from mrbugglez

:

this is a great deal but the filters are so expensive to replace and they never go on sale

If it's like the 400, you can get the aftermarket(non OEM) filters for cheap on Amazon.

5

1

avd

Apr 10, 2026 10:40 AM

260 Comments

Joined Jul 2011

avdApr 10, 2026 10:40 AM

260 Comments

Quote from mrbugglez

:

this is a great deal but the filters are so expensive to replace and they never go on sale

Thank you! Are the copycat replacements from no-name companies any good? There seem to be quite a few on sale for around $30/2 on Amazon. Here's one random example: https://a.co/d/0cA82JGu

1

beervomit

Pro

Apr 10, 2026 11:28 AM

1.9K Comments

Joined Nov 2013

beervomit

Pro

Apr 10, 2026 11:28 AM

1.9K Comments

I use a 4 pack of HVAC filters duct taped together to form a box. Carboard on the bottom. Box fan on the top. The fan is orientated to suck air in through the filters. All and all its' 20 bucks for the filters which are 1 time use but last a long time, 20 bucks for the fan, which is resuable, and about 5 bucks in duct tape every time I want to make a new one. Looks janky but works awesome.

1

omar10wahab

Apr 10, 2026 1:19 PM

1K Comments

Joined May 2016

omar10wahabApr 10, 2026 1:19 PM

1K Comments

Quote from beervomit

:

I use a 4 pack of HVAC filters duct taped together to form a box. Carboard on the bottom. Box fan on the top. The fan is orientated to suck air in through the filters. All and all its' 20 bucks for the filters which are 1 time use but last a long time, 20 bucks for the fan, which is resuable, and about 5 bucks in duct tape every time I want to make a new one. Looks janky but works awesome.

Your filter solution is not catching the particulates these devices are advertising to do. Not saying it's a bad option, because like you mentioned the price but it's limited functionality

1

MX400ex72

Apr 10, 2026 2:01 PM

2.9K Comments

Joined Aug 2016

MX400ex72Apr 10, 2026 2:01 PM

2.9K Comments

Quote from beervomit

:

I use a 4 pack of HVAC filters duct taped together to form a box. Carboard on the bottom. Box fan on the top. The fan is orientated to suck air in through the filters. All and all its' 20 bucks for the filters which are 1 time use but last a long time, 20 bucks for the fan, which is resuable, and about 5 bucks in duct tape every time I want to make a new one. Looks janky but works awesome.

They do have there purpose, but they aren't replacement for a good air purifier.Your setup just isn't going to be able to capture the fine particles. If visible dust particles is your concern, then that is doing its job very well for very cheap.

Tyross

Apr 10, 2026 3:11 PM

3.2K Comments

Joined Nov 2004

TyrossApr 10, 2026 3:11 PM

3.2K Comments

I bought the S version of this model back in 2019. I like it and it still works. I paid $300.

PurplePassenger101

Apr 10, 2026 4:01 PM

146 Comments

Joined Feb 2021

PurplePassenger101Apr 10, 2026 4:01 PM

146 Comments

Quote from beervomit

:

I use a 4 pack of HVAC filters duct taped together to form a box. Carboard on the bottom. Box fan on the top. The fan is orientated to suck air in through the filters. All and all its' 20 bucks for the filters which are 1 time use but last a long time, 20 bucks for the fan, which is resuable, and about 5 bucks in duct tape every time I want to make a new one. Looks janky but works awesome.

If you have a 3d printer you can print reusable supports for it instead of using duct tape

nylai

Apr 10, 2026 4:25 PM

35 Comments

Joined Nov 2015

nylaiApr 10, 2026 4:25 PM

35 Comments

This thing is a unit and awesome, for this price its a great deal. Might snag another for the incoming little human's room!

hkteaman

Pro

Apr 10, 2026 4:35 PM

3.4K Comments

Joined Mar 2007

hkteaman

Pro

Apr 10, 2026 4:35 PM

3.4K Comments

Quote from beervomit

:

I use a 4 pack of HVAC filters duct taped together to form a box. Carboard on the bottom. Box fan on the top. The fan is orientated to suck air in through the filters. All and all its' 20 bucks for the filters which are 1 time use but last a long time, 20 bucks for the fan, which is resuable, and about 5 bucks in duct tape every time I want to make a new one. Looks janky but works awesome.

I used a box fan setup during COVID and upgraded to a quieter fan with stronger suction (it really comes down to the fan's power and the filter quality) for about $30. I paired it with 20×20×1 MERV 10 carbon pads—about $47 at the time (replaced every 6 months, now around $64)—and 20×20×4 MERV 13 filters for about $78 (replaced annually, now around $100).

It worked really well during COVID, especially since we didn't have many visitors. In 2023–2024, I switched to a few different air purifiers, including the Airmega 300 and 400, along with some other brands when they were on sale.

The box fan setup is still great for the basement, but for the living room, I prefer something more aesthetically pleasing. This is just my personal preference.

televisionarchives

Apr 10, 2026 4:51 PM

575 Comments

Joined Jan 2017

televisionarchivesApr 10, 2026 4:51 PM

575 Comments

Quote from mass422

:

I have this exact unit and it has been nothing short of terrific. I bought it at $300. Great deal.

Same. I have allergy's and it works great to keep them under control

televisionarchives

Apr 10, 2026 4:52 PM

575 Comments

Joined Jan 2017

televisionarchivesApr 10, 2026 4:52 PM

575 Comments

Quote from avd

:

Thank you! Are the copycat replacements from no-name companies any good? There seem to be quite a few on sale for around $30/2 on Amazon. Here's one random example: https://a.co/d/0cA82JGu

Don't get those. They have a bad smell. Get the originals

Ride_The_Sky

Apr 10, 2026 5:14 PM

15.9K Comments

Joined Jan 2010

Ride_The_SkyApr 10, 2026 5:14 PM

15.9K Comments

Quote from hoxuantu

:

Buy one Airmega 300 or two Airmega 200? (assuming same price)

I got 400 for $350 but I would rather get add'l units depending on your home layout. Even if you have 1000+ sqft of space the performance depends on rooms walls etc..

Coway Airmega 300 Smart HEPA Air Purifier (White)

$249

$443

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