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expiredc0ld8 posted Apr 01, 2026 05:38 PM
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expiredc0ld8 posted Apr 01, 2026 05:38 PM

Costco Members: Winix C909 4-Stage Air Purifier

+ $5 S&H

$160

$200

20% off
Costco Wholesale
35 Comments 14,989 Views
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Deal Details
Costco Wholesale has for its Members: Winix C909 4-Stage Air Purifier w/ WiFi & PlasmaWave Technology (1022-0228-00) on sale for $159.99. Shipping is $4.99.

Thanks to Community Member c0ld8 for sharing this deal.

Features:
  • AHAM Verified up to 500 sq. ft. Room Coverage
  • Energy Star & UL Certified
  • Ultra-Quiet on Slowest Speed (25 db)
  • Wi-Fi Enabled for Instant Monitoring and Control
  • 2-Year Filter Supply: Includes 2 True HEPA replacement filters and 8 Activated Carbon Filters

Editor's Notes

Written by RevOne | Staff
  • This price matches our previous Frontpage Deal
  • This product is rated 4.6 out of 5 stars based on 760 customer reviews.
  • If you don't have a Costco Warehouse Membership, you can sign-up here

Original Post

Written by c0ld8
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has for its Members: Winix C909 4-Stage Air Purifier w/ WiFi & PlasmaWave Technology (1022-0228-00) on sale for $159.99. Shipping is $4.99.

Thanks to Community Member c0ld8 for sharing this deal.

Features:
  • AHAM Verified up to 500 sq. ft. Room Coverage
  • Energy Star & UL Certified
  • Ultra-Quiet on Slowest Speed (25 db)
  • Wi-Fi Enabled for Instant Monitoring and Control
  • 2-Year Filter Supply: Includes 2 True HEPA replacement filters and 8 Activated Carbon Filters

Editor's Notes

Written by RevOne | Staff
  • This price matches our previous Frontpage Deal
  • This product is rated 4.6 out of 5 stars based on 760 customer reviews.
  • If you don't have a Costco Warehouse Membership, you can sign-up here

Original Post

Written by c0ld8

Community Voting

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+45
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Top Comments

Ronzerwa
54 Posts
10 Reputation
I see its main benefit is for Data monitoring. Even when the fan is off, the device is tracking how air quality changes and that can give you insight of the reasons that cause your house's air quality to worsen. For some, it might be useful to turn it on an hour before they get home. Also, it enables you to use a voice assistant to turn it off and on.
It is definitely an unnecessary feature, as it doesn't help achieve its core function. But It is probably a marketing feature and also a way for the company to improve monetization. An app will probably push filter subscriptions. I am going to research privacy concerns with this product because of all this data being created. I have a suspicion that they could be selling data to the data brokers.
azzmatic
49 Posts
14 Reputation
I've had this unit for 18 months in the front room. Used the app with the wifi to program it to come on turbo speed from 2am to 4am then go down one speed from 4 to 6 then go down to quieter speed for the rest of the day. We have two cats an its amazing how much hair is in the prefilter I clean every few weeks.
Pulvarize63
133 Posts
73 Reputation
For me, it helps integration with other devices in the home. By using home assistant or Alexa, I have ecobee thermostats, air purifiers and Amazon air quality meter integrated together. If the air quality meter detects worse air quality, it signals the air purifier to start at high, tells ecobee to start fresh air ventilation from outside throughout the home and announce that the air quality is not good on the echo devices throughout the house. That way, just two air purifiers working with the ventilation fan can clear the air within minutes.

35 Comments

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Apr 01, 2026 09:58 PM
24 Posts
Joined Jun 2018
ShrewdOstrich230Apr 01, 2026 09:58 PM
24 Posts
Good deal, but the previous price for same model at Costco for $200 included two filters. Not sure if this one does.
1
Apr 01, 2026 10:05 PM
230 Posts
Joined Dec 2008
vicsta48Apr 01, 2026 10:05 PM
230 Posts
serious question - Why does this have Wifi? what is the benefit?
3
Apr 01, 2026 10:07 PM
933 Posts
Joined Feb 2024

This comment has been rated as unhelpful by Slickdeals users.

Apr 01, 2026 10:28 PM
12 Posts
Joined Nov 2018
LobstercrossingApr 01, 2026 10:28 PM
12 Posts
Quote from ShrewdOstrich230 :
Good deal, but the previous price for same model at Costco for $200 included two filters. Not sure if this one does.
Looking at the recent reviews, someone mentioned that it included 1-year of filters, so I'm assuming that means 2 extra filters.
Apr 01, 2026 11:28 PM
54 Posts
Joined Nov 2011
RonzerwaApr 01, 2026 11:28 PM
54 Posts
Quote from vicsta48 :
serious question - Why does this have Wifi? what is the benefit?
I see its main benefit is for Data monitoring. Even when the fan is off, the device is tracking how air quality changes and that can give you insight of the reasons that cause your house's air quality to worsen. For some, it might be useful to turn it on an hour before they get home. Also, it enables you to use a voice assistant to turn it off and on.
It is definitely an unnecessary feature, as it doesn't help achieve its core function. But It is probably a marketing feature and also a way for the company to improve monetization. An app will probably push filter subscriptions. I am going to research privacy concerns with this product because of all this data being created. I have a suspicion that they could be selling data to the data brokers.
1
Apr 02, 2026 02:52 AM
49 Posts
Joined Aug 2008
azzmaticApr 02, 2026 02:52 AM
49 Posts
I've had this unit for 18 months in the front room. Used the app with the wifi to program it to come on turbo speed from 2am to 4am then go down one speed from 4 to 6 then go down to quieter speed for the rest of the day. We have two cats an its amazing how much hair is in the prefilter I clean every few weeks.
Apr 02, 2026 03:01 AM
4,724 Posts
Joined Feb 2006
Processing...Apr 02, 2026 03:01 AM
4,724 Posts
Quote from Ronzerwa :
I see its main benefit is for Data monitoring. Even when the fan is off, the device is tracking how air quality changes and that can give you insight of the reasons that cause your house's air quality to worsen. For some, it might be useful to turn it on an hour before they get home. Also, it enables you to use a voice assistant to turn it off and on.
It is definitely an unnecessary feature, as it doesn't help achieve its core function. But It is probably a marketing feature and also a way for the company to improve monetization. An app will probably push filter subscriptions. I am going to research privacy concerns with this product because of all this data being created. I have a suspicion that they could be selling data to the data brokers.
Remember that you can always use them without activating the WiFi feature

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Apr 02, 2026 04:05 AM
1,451 Posts
Joined Feb 2017
mixpieApr 02, 2026 04:05 AM
1,451 Posts
This one or Daikin? https://www.amazon.com/dp/B0B5JWVJTD
2
Apr 02, 2026 04:45 AM
6,545 Posts
Joined Dec 2004
CaleoApr 02, 2026 04:45 AM
6,545 Posts
I wonder if this unit uses the same filters that I already have my old Winix 5300-2. Looks like it might. I've had it for a bit over 5 years & I'm a little bummed because lately its fan has been getting louder - sounds like the bearings are going. Been thinking about getting a new one.

...but now that I've done a quick search, there are several vids bearing replacements and it uses standard 608ZZ bearings which I just happen to already have around. Suppose I'll give that a shot before dropping $165.
Edit: Easier said than done, looks like it'll require some desoldering to get to one of the bearings. I can probably manage but not a quick/easy fix.
Last edited by Caleo April 1, 2026 at 09:57 PM.
Apr 02, 2026 06:21 AM
133 Posts
Joined Oct 2016
Pulvarize63Apr 02, 2026 06:21 AM
133 Posts

Our community has rated this post as helpful. If you agree, why not thank Pulvarize63

Quote from vicsta48 :
serious question - Why does this have Wifi? what is the benefit?
For me, it helps integration with other devices in the home. By using home assistant or Alexa, I have ecobee thermostats, air purifiers and Amazon air quality meter integrated together. If the air quality meter detects worse air quality, it signals the air purifier to start at high, tells ecobee to start fresh air ventilation from outside throughout the home and announce that the air quality is not good on the echo devices throughout the house. That way, just two air purifiers working with the ventilation fan can clear the air within minutes.
1
Apr 02, 2026 06:26 AM
531 Posts
Joined Apr 2006
fatdealzApr 02, 2026 06:26 AM
531 Posts
Quote from mixpie :
This one or Daikin? https://www.amazon.com/dp/B0B5JWVJTD
Get this one, the Daikin is no longer on sale. The Winix C909 is also more powerful and covers a much larger room area (500 sq ft vs 350 sq ft, it's better to go over than under). The main thing the Daikin had going for it was the 50% off price and built-in evaporative humidifier (if you needed one).

The C909 from Costco comes with 2 years of filters, and the return policy can't be beat if you happen to need it.
Last edited by fatdealz April 2, 2026 at 02:35 PM.
Apr 02, 2026 08:45 AM
1,000 Posts
Joined Feb 2013
DealHunter1001Apr 02, 2026 08:45 AM
1,000 Posts
Can anyone compare this and 5510 that I got it for $105?
Apr 02, 2026 09:34 AM
53 Posts
Joined May 2015
kbracing6Apr 02, 2026 09:34 AM
53 Posts
Quote from DealHunter1001 :
Can anyone compare this and 5510 that I got it for $105?
C909 is generally more powerful, featuring a higher CADR (267 CFM vs 253 CFM) and better coverage for larger spaces, while the 5510 is a quieter, more compact, and newer design. I'm returning my 5520 for this deal because of sq ft coverage.
Apr 02, 2026 01:12 PM
191 Posts
Joined May 2012
sahivelyApr 02, 2026 01:12 PM
191 Posts
Quote from vicsta48 :
serious question - Why does this have Wifi? what is the benefit?
I can see the filter status and crank the fan up or down from anywhere. Necessary? No. But cool.

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Apr 02, 2026 06:37 PM
48 Posts
Joined Sep 2022
BlueShape5927Apr 02, 2026 06:37 PM
48 Posts
Quote from fatdealz :

Get this one. The Daikin is no longer on sale. The Winix C909 is also more powerful and covers a much larger room area (it's better to go over than under). The main thing the Daikin had going for it was the 50% off price and a humidifier (if you needed one).

And of course, the Costco return policy can't be beat if you happen to need it.
I picked up a Daikin MCB70YSAU about a week ago at 50% off ($67 or so). It's pretty big and looks like an office appliance, but I don't mind.
It's quiet most of the time, but something feels a bit off?! or maybe it's just me since this is my first air purifier?! It doesn't seem like it's pushing much air.
One second the sensor says the air is clean, the next it goes crazy and the fan ramps up for a couple of minutes, then it goes quiet again. Is that normal?
Just wanted to see if this is normal behavior for a device like this. Thanks.

Turbo (247CFM), Standard (124CFM), Low (78CFM), Quiet (57CFM)
Room Size: 350 ft2
Smoke CADR: 226
Dust CADR: 227
PM2.5 CADR: 226
Pollen CADR: 230
Last edited by BlueShape5927 April 2, 2026 at 11:56 AM.

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