Winix - C535/C909
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Reddit Reviews:
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Based on 1 year's data from Feb 14, 2026 How it works
Liked most:
39
4
"I recently found out I have a bunch of allergies- including my dog, so I got these Winix units to try and help combat the allergies. ... Within about 45 minutes of running one in my living room, part of my nose that has been clogged for as long as I can remember opened up. I’m breathing better than I have in years."
"It wasn't until I upgraded to 2 winix machines that I finally got relief and it was instant."
"they work extremely well"
16
0
"it’s has one of the largest coverage area among winix air purifier ... the performance to price ratio is unmatch."
"CADRs are in the 300s CFM for $199.99. ... I own one and it's very good value"
"C909s from Costco are pretty good cost to filter ratio if you need a lot. ... For the Costco version it's 199 online retail"
25
4
"I recently found out I have a bunch of allergies- including my dog, so I got these Winix units to try and help combat the allergies. ... Within about 45 minutes of running one in my living room, part of my nose that has been clogged for as long as I can remember opened up. I’m breathing better than I have in years."
"It wasn't until I upgraded to 2 winix machines that I finally got relief and it was instant."
"My Winix is unbelievable. If you fart or even spray any chemicals, cooking. It turns red capturing all the odors from the chemicals. The orange, 10 minutes later it turns blue again."
16
6
"My two Winix units are 11 years old with 24/7 use and still going strong!"
"I have 2 Winix HEPAs that have been running 24/7 for 6+ years."
"I got annoyed when my winnnix developed a noise, but then I realized it was the unit I’ve been running almost 24/7 for ten years. ... The 2015-ish one is still fine."
14
6
"There’s 3 filters. A large particle one I vacuum monthly. A medium particle filter that replaced every 3 months and a fine particle filter that’s done every 12. A years kit of them is $30 on Amazon"
"Comes with 2 years worth of air filters (stored inside the machine when it arrives to you- I had to figure that out lol)."
"Filter replacements are still very cheap from [The Home Depot](https://www.homedepot.com/p/Winix-True-HEPA-4-Filter-Activated-Carbon-Replacement-Filter-A-115115/202034412)."
Disliked most:
4
3
"I don't run it on the highest setting ("Turbo") generally because it's too loud for a 175 sq. ft. office"
"The C909 will be fairly loud on the highest setting called "Turbo" - about 60 dBA according to the Decibel X Android app"
"it is fairly loud on 'Turbo' - around 60 dBA according to the Decibel X Android app."
3
9
"I don't run it on the highest setting ("Turbo") generally because it's too loud for a 175 sq. ft. office"
"I just opened up and replaced bearings on one that has been running for maybe 8 years as it got too noisy."
"The C909 will be fairly loud on the highest setting called "Turbo" - about 60 dBA according to the Decibel X Android app"
0
3
"The Winix has a light sensor that doesn't allow it to work in auto mode in a dark room. ... If I put mine in auto mode and turn the room lights off it goes into sleep mode which is basically turning it off."
"A window can be open across the house and my Ninja will notice a drop in AQI and speed up the fan while the winix just continues to blow slow. ... I have noticed if I turn the fan speed up on the winix it will notice the AQI change, but that makes the auto mode useless."
"Just don't rely on auto mode"
6
7
"filter replacements can get pricey though ... filters are WAY overpriced considering you can get the machine with 2 filters for $120.."
"You have to spend 5x more if you want true odor control. ... The little carbon filter isn't doing a whole lot."
"I could buy a brand new unit for the price of 3 replacement filters."
883Max 1.0If you have a Costco membership the Winix C909 is the absolute best bang for the buck. It has a much great air capacity than the 5500-2 which means you can run it at a low (not noisy) setting and still handle a good amount of air (general guideline is that you want at least 5 air changes per hour to have a real benefit from an air purifier). The C909 is the same as the 9800, but it is a Costco exclusive. It is $199 and comes with two years worth of filters.
brrrchill 1.0Hey OP. I've owned several different air filters over the years and they've all helped a lot to lower the dust level and subdue my allergies. Even the cheap ones do shit. One thing is you have to clean the filters! The pre- filter gets dirty. Fills up with dust. I do like the Winix filters from Costco. The one I've got came with extra filters, which is really nice, cause the filters are like printer ink.
Calm-Neighborhood631 1.0This question has been asked a lot recently. I really like the Winix from Costco, about $100 and then turn off ionizers (produces small amounts of ozone). I barely get dust in my house since we run a few of them throughout the house.
Multiple Winix from Costco. Significant difference. Hardly any dust in our house. Affordable. Turn off ionizer on them!
Electronic-Owl1429 1.0I use a couple of Winix air purifiers from Costco. I have also used a Shark 3 in 1 clean sense. Both have HEPA filters and work well and are also pretty quiet, no problem with running them while I sleep.
LaplacesBox-0096 1.0Vouching for Winix. Have several of the $100 models from Costco throughout the house for almost 10yrs and still going strong. Take care of the unit and clean and chg filters regularly. Coway is also great.
LazyAccount-ant 1.0yup had my winix since 2017. runs 24/7
a winix 5300 or 535s are the sweet spot for price and CADR. Corsi Rosenthal for the DIY will beat anything on this list though
QuarrelsomeCreek 1.0Winix from costco. I've stress tested it during a wildfire that got within a few miles of my home. I do not recommend Blue Air. Its more expensive and less effective.
rlpfc 1.0We have a couple Winix purifiers from Costco and they're great. High CADR, compact, and they go on sale frequently. The HPA300 from Honeywell is also a great unit.
slickxsparkie 1.0The winix i bought from Costco lasted 2 years. 3/4 of them died last month. Waiting for the last one to join the rest of them. I did buy the newer round one, so maybe we'll try that out for the next couple years
staysour 1.0You can turn the plasma wave off and it will be fine. I have it on 3 and its pretty quiet. Also, at my costco that unit was only $100 while on sale.
Winix is pretty solid. You can look up their aham verifications. This one specifically is pretty good. Turns the air in a 300sq ft room 4.8 times on high. For $100, you can put these in every room and call it a day.
For $100 vs $1100 this winix is a solid choice. Especially to put one in every room. The IQ Air has max room coverage of 1000sq ft just like the winix air. So im assuming (since iq air did not specify) the iq air turns the air in a 1000sq ft space once an hour on high. The price difference seems to be coming from the charcoal filter media. You can make a better VOCs filter from AC infinity charcoal filter and inline fan for $300 or so.
Getting the winix from costco means you can return it if you are not satisfied with the product. This is my 3rd unit. The previous 2 lasted 5+ and 2+ years and did not break. All at this similar price point of about $100. Winix is AHAM verified. I do not see the verification for the IQ Air. And both handle the same amount of space except the IQ air is not independently verified. The winix specifies that it can handle rooms of up to 1000sq ft in an hour with 1 air change. The IQ air says it handles rooms up to 1000 sq ft, but does not specify anything else. I am assuming they mean 1 air change an hour.
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