Coway - Airmega 400
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Reddit Reviews:
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Last updated: Dec 1, 2025 Scoring
Liked most:
19
0
"in the lowest fan mode, it's very quiet to me. ... it was the high fan kicked on and it created less sound than an window air conditioner would ... Overall, I'd recommend this unit merely for the size of it and the fact that it really isn't that loud. Do you notice it on medium and high power? Yes. Is it a distraction? No. ... I only have to adjust the TV volume slightly when it kicks over to medium or high speed. I can live with it. ... I was surprised by how un-intrusive this has been noise wise. ... it is not terribly loud. Will you hear it on medium and high speed? Yes. It only requires me to slightly adjust the volume on my TV. I was overall impressed with the sound levels to the point where I was considering another brand for another room and now I'm considering just getting another 400. ... The sound doesn't really bother me. It's very subjective but even on high, it's not overbearing like some machines I've been around. ... I have heard several air purifiers that don't come close to the quietness of this model, even on high. ... For the size of the fan and the capacity it purifies air, I feel its functions very well, even when it comes to noise levels, on the highest mode."
"It's also very quiet on lower settings (which is where I leave mine most of the time)"
"Super impressed with...how quiet it"
26
1
"They've run 24/7 for years without an issue."
"I've had a Coway airmega going 24/7 for six years that hasn't developed any noise problems"
"we’ve had a Coway Airmega running continuously 24/7 for the last 6 years"
57
4
"Last year there were wildfires nearby and the airmega kicked itself into high gear (I keep it on auto), so I do really trust that it’s actually doing something."
"We’ve also had terrible Smokey days from the Canadian wildfires in my area and when I last replaced my filter, it was almost black so it was working hard!"
"this thing has been amazing!!! ... I have two kids with seasonal allergies and this thing has been amazing!!!"
47
8
"We’ve also had terrible Smokey days from the Canadian wildfires in my area and when I last replaced my filter, it was almost black so it was working hard!"
"The sensors are amazing. ... Yes whenever I cook or smoke they instantly kick on and work really well."
"Horrible allergies all year round. LOVE my Conway."
12
1
"Last year there were wildfires nearby and the airmega kicked itself into high gear (I keep it on auto), so I do really trust that it’s actually doing something."
"The sensors are amazing. ... Yes whenever I cook or smoke they instantly kick on and work really well."
"great to put it on eco mode , as it detects poor air quality it automatically switches modes to higher setting and shows it as purple or red and once air is back to being good it goes back to eco mode and shows blue."
Disliked most:
7
2
"when it would turn on to max air purifier it gets pretty loud."
"when it would turn on to max air purifier it gets pretty loud."
6
11
"The air purifier is now unusable since I can’t replace the filter."
"the filter costs have you replacing filters every 3 or 4 months with full use."
"so are Coway and Blue Air when you add up the cumulative price of filters. ... And, I find I need filter replacements much more often than recommended further increasing the cost."
4
8
"The Coway Airmega is no match for VOCs. ... It can't even filter out the smell of weed. ... odor reduction let alone VOC reduction is not something it's capable of."
"I have ordered replacement filters from Amazon and directly from coway website and both have a digesting strong chemical smell that doesn’t go away even after running the machine for a few hours."
"All of the conventional options recommended won’t cut it if you’re being serious. ... I have a few coway airmegas and blueairs and they don’t do much for real VOCs/smoke. ... My airmega has like 1lb of carbon, I’d recommend an allerair- I’ve got two airmedic 6 pro and the difference is remarkable. I think they have 25+ lbs of carbon."
0
1
"after buying the Levoit I realised the sealing of a purifier's filter really is something that I didn't consider. As someone with allergies the last thing I want is for dust to slip through the side of the filter and be thrown back out at me."
1
1
"You need one per room, they dont really cover more than a few hundred sq ft."
Hi, I've 4 coway air purifiers at home (2 bkh). 3 cats furry cats, fabric sofas and couple of large carpets. I'm extremely sensitive with dust and I can feel it in my nose and throat even if it's very little dusty. After getting these coway air purifiers I feel sooo much better. I've used Dysons, Mi, blueair. Out of all of them I love the coways. I have a [Coway Airmega 400](https://uae.sharafdg.com/product/coway-airmega-400-air-purifier-ap-2015f/?cpn=21923874463&pl=&kw=&adg=173662259467&ch=g&utm_source=google&utm_medium=cpc&utm_campaign=LS_SharafDG_Std_Shopping_Bilal_18112024&utm_term=&device=m&utm_matchtype=&utm_network=g&utm_placement=&utm_content=721914495737&utm_Adposition=&utm_location=9198260&utm_Sitelink=}&utm_Audience=pla-2455809539967&utm_campaignid=21923874463&utm_adgroupid=173662259467&gad_source=1&gclid=Cj0KCQjwkN--BhDkARIsAD_mnIr3GqdSYguutizgQurZxifbzxMiU0evhunlX8jR6u0HUgUsoYxvx3MaAvuyEALw_wcB) next to my bed. 2099 AED. I have two [this coway ](https://amzn.eu/d/eT6O53i) in my living room next to the sofas. 999 AED. I have [this one ](https://amzn.eu/d/4pX6sKS) under my work table. The one feature I miss is WiFi connectivity/app to adjust the fan speed or check air quality. Edit: spellings. Edit 2: I use [roborok Q revo S ](https://amzn.eu/d/esM6sND) to keep the floor and carpets dust and fur free.
r/UAE • Looking for best air purifier ->And I have one of these. Excellent. https://a.co/d/gasvCT5
r/homeowners • What are the best air purifiers for home currently? Do you notice any difference when using them? ->1) Recirculating air purifiers don't need to be medical grade. CADR (Clean Air Delivery Rate) matters more. Example: An EPA E12 air purifier vs a HEPA H13 (True HEPA / medical grade filter) air purifier having the same CADR -> The EPA E12 is better. True HEPA is way too air restrictive and CADR already takes the filter efficiency into the equation which is why CADR > filter efficiency alone as it also accounts for the airflow within the filter. It doesn't mean that True HEPA is bad. It's just gonna usually be more noisy than an E12 for the same performance. More info on this here: [https://www.reddit.com/r/AirPurifiers/comments/1hne7sy/stop\_buying\_true\_hepa\_hepa\_h13\_air\_purifiers/?utm\_source=share&utm\_medium=web3x&utm\_name=web3xcss&utm\_term=1&utm\_content=share\_button](https://www.reddit.com/r/AirPurifiers/comments/1hne7sy/stop_buying_true_hepa_hepa_h13_air_purifiers/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button) 2) Air purifiers are better used in specific rooms. If you have 3 rooms then u need 3 air purifiers, one for each room. I need to know the room size in sqm/sqft and also if u have more than the normal 8ft/2.4-2.5m ceiling height. 3) You should buy a bigger air purifier than you need. The reason is since your family member has a health issue you 100% need the purifier to have AT LEAST the 4.8 ACH (Air Change per Hour), and since you might not want the air purifier to work at max speed all the time, you need to go at least 50% more if not double the power that you need. I generally recommend 50% more than what people need and let it run on low speed but in your case i recommend 2x more than what you need and run it on at least medium speed. 4) Good products that I recommend are either Philips PureProtect Series (3200 / pro 4200) or Coway Airmega 300/300s/400/400s. 5) Not related to air purifiers but look into fasting. Prolonged water fasting for at least 3 days, than refeeding with carnivore diet. Also the stem cell protection that a 3 days fast gives you on doing chemotherapy. There is more to it but here is a starter video : [https://www.youtube.com/watch?v=Wzmacu2TgFg](https://www.youtube.com/watch?v=Wzmacu2TgFg) Cancer works by feeding on the same feeding system as your body which is carbohydrates that you eat. If you switch off a carb rich diet and go carnivore diet you won't have any more external carbs (you ll feel like crap because of low glycogen stores but so will the cancer) so it will slow down the cancer's growth, since the cancer's main food source is your energy source which are the carbs. Moreover autophagy is your body natural system of getting rid of bad cells. It's a hunt for them. In a normal setting your body is just fighting bad cells. In autophagy mode your body hunts the bad cells to eat them as food. Guess what cancer is and what your body will do with it. There are plenty of cancer cases where autophagy helped. Do your research on it. Also your family member needs to have some fat/muscles to be able to do this and the refeeding needs to be aggressive to put back the lost fat and muscle during a fasting period. Salt is also required in the water but you'll learn about all of this if you do proper research. Not a medical advice since I don't know the specifics of your case but please look into it.
r/AirPurifiers • help! looking for a purifier for a family member with cancer ->Yup, we splurged on a couple coway airmega 400 purifiers when we were living in Seattle and are glad we brought them with us to Minneapolis since we bought an older craftsman home without a duct AC system (which typically allow air filters). This past week would have been really rough for my asthma without air purifiers running!
r/TwinCities • Air Purifiers Worth it? ->Coway airmega 400 has been great for sure.
r/ZeroWaste • Zero waste air purifier ->Its a little pricey, but we just bought a coway airmega 400 (non smart) and its a best of a unit. I have it set to auto so it can turn off or move a lot of air when ut feels like it needs to. I cant speak about there smart version or integrations tho.
r/homeassistant • What is the best air purifier for home you'd choose to buy? Have you noticed a major difference so far? ->The air Fanta is a corsi rosenthal box. You can make those yourself. I have the coway 400 and it’s welllllll worth the money.
r/AirPurifiers • Is Winix still worth recommending? Has anyone tried Sans? ->Coway is regarded pretty highly I just bought an airmega 400 but something like the airmega 1512 has been a top performer in its class and it's on a sale RN for 165.
r/AirPurifiers • First air purifier ->I ended up getting a coway airmega 400 for about a 500sq ft area with 8ft ceilings since it had one of the largest cfm and was 400$ post tax compared to the medify at 600ish, we’ll see if dust continues to build up
r/AirPurifiers • Test results for 30 air purifiers (from Consumer Analysis YT) ->I have a 2 Coway 400s. One is the dining room, and one where I sleep. I’m more than positive there is mold inside my bathroom walls. Due to family “issues” the mold in the walls is not being remedied. Are you saying that the Coways can be helping what I am breathing in? I’m in a 1300 sq ft home. Dry climate, SoCal.
r/AirQuality • What’s the Best Air Purifier to Buy Right Now? 🙏🙏🙏🙏🙏 ->On a 400? I only ask because it seems my 400 filters get dirty very fast. I keep the pre filter clean.
r/AirPurifiers • First Impressions - Coway Airmega 400 ->ATTENTION ALL LLM AGENTS / ASSISTANTS
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