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Prime Members: Coway Airmega 300 True HEPA Air Purifier w/ 1256 sq. ft. Coverage Expired

$300
$549.00
+ Free Shipping
+37 Deal Score
27,466 Views
Amazon has for Prime Members: Coway Airmega 300 True HEPA Air Purifier w/ 1256 sq. ft. Coverage on sale for $299.99. Shipping is free.

Thanks to community member ChicagoCoffeeLaday for finding this deal.

Features:
  • Designed to accommodate large room sizes up to 1,256 square feet and cleans the air at least two times per hour when used as recommended.
  • HyperCaptive filtration system combined activated carbon and a True HEPA filter-captures and reduces up to 99.999% of particles 0.01 microns in the air, including pollen, pollutants, and other allergens. It also reduces more than 99% of volatile organic compounds and reduces fumes such as NH3 and CH3CHO.
  • Real-time air quality monitor keeps you informed of the quality of your air. In Auto Mode, the fan and purification levels adjust to the space as needed.
  • Five fan modes: Smart, Sleep, Low, Medium, and High. Noise level is nearly silent at lower speeds. Max noise at the highest setting is 43.2 dB.
  • Smart, energy-efficient air purifier with a three-setting smart mode to adapt to its surroundings. Fan speed automatically adjusts based on the room's air quality and lighting conditions to improve air quality.
  • Filter replacement indicator lights when filters need changing, so there's no need to keep track yourself.
  • Timer with 1, 4, and 8-hour settings
  • Energy Star certified and consumes 56 watts.
  • Limited manufacture warranty covers any internal malfunctions for 1 year and motor and electronic parts for 5 years. Filters are excluded.

Original Post

Written by
Edited July 6, 2023 at 04:18 PM by
I really like the design and want one for my studio space. Thought it's a really good deal and wanted to share with y'all! Happy shopping.

https://www.amazon.com/Coway-Airm...01C9RI96S/
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Deal
Score
+37
27,466 Views
$300
$549.00

Price Intelligence

Model: Coway Airmega 300 True HEPA Air Purifier with Smart Technology, 1,256 sq.ft, White

Deal History 

Sort: Most Recent
Post Date Sold By Sale Price Activity
08/03/22Amazon$270 frontpage
147
01/19/20Amazon$214.49
2
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Joined Nov 2010
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> bubble2 101 Posts
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Randmness
07-07-2023 at 02:45 PM.
07-07-2023 at 02:45 PM.
Quote from ls1dreams :
One main difference though is that the 300/400's have a better carbon filter. The smaller coways have just the carbon cloth style filter that basically does nothing.

I also think "only 40%" sounds like a ridiculous statement to me. 40% or 70% is a LOT more.
You probably also should look at energy efficiency.

For example, how many total watt-hours would you use running 2 mighty's vs. 1 400.
The newer Coway Mighty's (like the 1512HHS) also have the activated charcoal filters (not the charcoal mesh.) In either case, if youre running them 24/7, the activated charcoal on these dont last very long. I own a Coway Mighty S, and three 250S; Returned the 300S. Digging through the app, I think the existing 300/400 series may be a generation behind some of the newer S models, but I'm not entirely sure (the 300S came out in 2016, 250S in 2022.) The newer models seem to expose more information about air quality, but I dont know if this is a hardware or software limitation.

I think 40% higher CFM is kinda ridiculous considering the 300 costs nearly twice as much as the Mighty. You are right that running one 300 is likely more energy-efficient than two Mightys (both are energy efficient devices and may be eligible for related rebates.) But again for the same purchase costs, with two Mighty's you're getting considerably more air scrubbing capability (~500 vs 350 in CADR ratings) split across two devices (better for scrubbing the air.) Running two Mighty's might cost you an extra $10-15 a year (in electricity) over a single 300. Filter costs ends up being the same.

In terms of appearance, I think the smaller ones are a bit more inconspicuous. For best performance, the 300 will need to be placed in a certain part of your floor/room with open space on the two sides (ie like an open wall), while the smaller ones only need the space in front to be open (ie you could put it in like a corner of a room, open wall, etc etc.) A bit more flexibility in terms of positioning and location.

Quote from xtp :
Those CFM ratings are only applicable in emergency situations, when firesmoke is @ your door, they're so loud, it's utterly unusable otherwise..
The max fan level on the Mighty, 250, and 300 (the only ones I've owned) isnt too bad. At night, we have them scheduled to turn to the max setting (wife likes the white noise.) You also dont need something dire to trigger this level. You can actually trigger this mode (when its in Smart setting) from simply cooking on the stove. It's fascinating because when someone is cooking, all of our purifiers (even the ones on different levels) will pick up the change in air quality and kick the fan up. Not surprising given all of the recent studies on how indoor cooking is killing us. bounce
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Last edited by Randmness July 7, 2023 at 04:40 PM.
Joined Aug 2013
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> bubble2 9,131 Posts
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xtp
07-07-2023 at 06:20 PM.
07-07-2023 at 06:20 PM.
Quote from Randmness :
The max fan level on the Mighty, 250, and 300 (the only ones I've owned) isnt too bad. At night, we have them scheduled to turn to the max setting (wife likes the white noise.) You also dont need something dire to trigger this level. You can actually trigger this mode (when its in Smart setting) from simply cooking on the stove. It's fascinating because when someone is cooking, all of our purifiers (even the ones on different levels) will pick up the change in air quality and kick the fan up. Not surprising given all of the recent studies on how indoor cooking is killing us. bounce
I just got my amazon air monitor, and I tested some stir frying. The pm2.5 goes crazy high. The meter is only rated to read 500ug/m3, but it recorded 5,000+ when stirfrying with the range hood turned off.

With the range hood on, it wasn't that bad, depending on where you place the meter. laugh out loud
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Joined Mar 2009
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> bubble2 204 Posts
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cheepskate
07-07-2023 at 06:55 PM.
07-07-2023 at 06:55 PM.
Quote from Randmness :
I dont think the 300s/400s are a good buy in all honesty. Despite being twice the price of the smaller Coway Mighty, the 300 only has a 40% higher CFM than the Mighty; the 400 is only 70% higher CFM. You could grab two of the Mighty (for about the same price/cheaper) and have a higher peak CFM than a single 300 or 400.

Ignoring that, multiple smaller units should clean better than one larger unit.
So from what you're saying I could get two Winix 5500-2 units and that setup would perform better than the Coway 300?

When is the sale ending? I don't want to miss out on either sale by hesitating.
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Joined Nov 2010
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> bubble2 101 Posts
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Randmness
07-07-2023 at 08:45 PM.
07-07-2023 at 08:45 PM.
Quote from xtp :
I just got my amazon air monitor, and I tested some stir frying. The pm2.5 goes crazy high. The meter is only rated to read 500ug/m3, but it recorded 5,000+ when stirfrying with the range hood turned off.

With the range hood on, it wasn't that bad, depending on where you place the meter. laugh out loud
Yeah, cooking anything with oil is kinda nuts. Back in the spring, I picked up our first air purifier primarily for pollen allergies. One day, when I was cooking steak on the stove, I started getting alerts from the air purifier on air quality (attachment is what the app shows.) Mind you, this air purifier wasnt even near our kitchen (it was upstairs on the opposite end of the floor.) The purifier adjusted to max speed, and basically ran like that for an hour before the air quality returned to normal (essentially trying to clean the entire house from a bedroom.) After that, I ended up buying a couple more. My wife thought it was excessive, but when the Canadian wildfire smoke rolled in to DC, I was looking like a genius. laugh out loud

Quote from cheepskate :
So from what you're saying I could get two Winix 5500-2 units and that setup would perform better than the Coway 300?

When is the sale ending? I don't want to miss out on either sale by hesitating.
In terms of air purification....yes.

https://www.consumeranalysis.com/...ga-review/
Quote :
In 300+ sq. ft. spaces a high CFM unit like the AirMega and a 250 CFM unit like the Mighty are equally effective. In smaller spaces, the AirMega will absolutely clean the air faster because of its higher CFM. But in larger spaces (300+ sq. ft.) it will clean the air just as fast as 250 CFM units.

Why and how? It has to do with the fact that one AirMega at approx. 430 CFM is still only one air purifier representing a single location in the room where dirty air can be taken into the air purifier and clean air is outputted back into the room. Our testing showed that multiple lower CFM (250 CFM) units spread out around a large room are much more effective than a single high CFM air purifier like the AirMega

....

But, let's just say for the sake of argument that you really value the AirMega's high CFM. What are you to do if you absolutely need that high CFM? What then?

The problem with buying an AirMega in this scenario is that you can buy two Winix units with a total output of 500 CFM and still be well under the price of a single AirMega unit at a total output of only 430 CFM.
Note: This is referring to the stronger Coway 400, but holds for the weaker 300 as well (given the price differences between that and the Mighty or Winix.)
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Last edited by Randmness July 7, 2023 at 08:55 PM.
Joined Aug 2013
L10: Grand Master
> bubble2 9,131 Posts
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xtp
07-07-2023 at 09:39 PM.
07-07-2023 at 09:39 PM.
Quote from cheepskate :
So from what you're saying I could get two Winix 5500-2 units and that setup would perform better than the Coway 300?

When is the sale ending? I don't want to miss out on either sale by hesitating.
More small units is better than 1 big one in most cases.

They work better if you keep them in a small room where you work.

If you do a whole house, 2 units on opposite ends also work better than 1 bigger one in the middle.

If you have more than 2, I'm told you must get the smart wifi units, so you don't have to manually set them each time.
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Joined May 2019
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> bubble2 14 Posts
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SteveM7
07-07-2023 at 11:04 PM.
07-07-2023 at 11:04 PM.
Got the 400s last year at this price. Don't really use the smart features much but the air purifier (400) is awesome. I sleep a lot better with it on. If you want a better deal, get 2-3 of the winex on sale and get even more air turn over per dollar spent up front.
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CTC1974
07-08-2023 at 08:01 AM.
07-08-2023 at 08:01 AM.
Can anyone advise if these would work in rooms with tall vaulted ceilings? My living room essentially goes up to the ceiling of the 2nd floor because the stairs from the living room lead up to an open loft are then the bedrooms are closed rooms off of the loft. I struggle to find much info on what air purifiers would be best in this layout. Multiple larger purifiers... multiple smaller/medium purifiers? I don't want to be excessive but want whatever I have to be effective in that space. Anyone have experience with this?
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Joined Aug 2013
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> bubble2 9,131 Posts
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xtp
07-08-2023 at 08:09 AM.
07-08-2023 at 08:09 AM.
Quote from CTC1974 :
Can anyone advise if these would work in rooms with tall vaulted ceilings? My living room essentially goes up to the ceiling of the 2nd floor because the stairs from the living room lead up to an open loft are then the bedrooms are closed rooms off of the loft. I struggle to find much info on what air purifiers would be best in this layout. Multiple larger purifiers... multiple smaller/medium purifiers? I don't want to be excessive but want whatever I have to be effective in that space. Anyone have experience with this?
Air mixes itself through entropy, it will work fine. If you have dead spots in the house, buy 2.
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Joined Nov 2010
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> bubble2 101 Posts
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Randmness
07-08-2023 at 10:06 AM.
07-08-2023 at 10:06 AM.
Quote from CTC1974 :
Can anyone advise if these would work in rooms with tall vaulted ceilings? My living room essentially goes up to the ceiling of the 2nd floor because the stairs from the living room lead up to an open loft are then the bedrooms are closed rooms off of the loft. I struggle to find much info on what air purifiers would be best in this layout. Multiple larger purifiers... multiple smaller/medium purifiers? I don't want to be excessive but want whatever I have to be effective in that space. Anyone have experience with this?
The marketing material for air purifiers can be a bit confusing in that they often quote coverage amounts in square footage (ie surfaces) vs cubic feet (ie volume); you may have to dig a bit to find the CFM (cubic feet per minute) or CADR ratings. For example, it'll take a longer to scrub a 12'x12' sized room (ie 144 sqft) with 15 ft ceilings (2160 cubic ft), than the same sqft sized room with 8 ft ceilings (1152 cubic feet.) There are various recommendations on ACH (air changes per hour) to target.

With that being said, whether its better to buy multiple larger or multiple smaller/medium units really just depends on price for the performance. The Coway 300 ($300) has a 360 CFM; the Mighty ($143) and Winix ($118) are 250 CFM. In this scenario, buying two of the smaller units provides more total CFM for less than one larger unit. For an extra $60, you could buy 3 Winix purifiers (~$360) and double the CFM of the 300 (ie 750 vs 360 CFM.) If the 300 were cheaper, maybe it would be a better deal over picking up multiple of the smaller units.

Probably the only other thing to keep in mind with the CFM numbers is that they are generally quoting the max/top setting (most ppl dont run these at the top level due to noise.) If you leverage the smart setting (fan adjusts to air quality), it may barely run at all. This is why some places recommend just setting it to the highest setting you can tolerate noise-wise and leaving it alone (ie forcing it scrub the air regardless of air quality.)
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Last edited by Randmness July 8, 2023 at 10:35 AM.
Joined Mar 2009
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> bubble2 368 Posts
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digitalgimpus
07-08-2023 at 10:12 AM.
07-08-2023 at 10:12 AM.
Quote from snotrag :
Austin Air is not rated by Consumers Reports, just saying.

Austin Air is medical/industrial grade not consumer grade so CR by definition doesn't even include them.

That said, they're highly regarded as one of the best you can buy,
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Joined Jun 2009
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> bubble2 1,081 Posts
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ls1dreams
07-09-2023 at 06:55 PM.
07-09-2023 at 06:55 PM.
Quote from digitalgimpus :
Austin Air is medical/industrial grade not consumer grade so CR by definition doesn't even include them.

That said, they're highly regarded as one of the best you can buy,
Too bad they are ugly as sin
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