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frontpagegmfitzg2 posted Jul 26, 2026 10:42 PM

Costco Members: 2-Pk Winix Replacement Air Filters (C545 / C535 / C909)

$60

$80

25% off
+ Free S&Hat Costco Wholesale
7.4K Views
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Deal Details
Costco Wholesale has for Costco Members: 2-Pack Winix Replacement Air Purifier Filters (various) on sale listed below for $59.99. Shipping is free.

Thanks to Community Members gmfitzg2 for sharing this deal.

Available:Features:
  • True-HEPA Filtration
  • Captures up to 99.97% of Particles as Small as 0.3 Microns
  • Activated Carbon Filters: Reduces VOCs and Odors from Cooking, Pets, and Smoke

Editor's Notes

Written by Wiznaz | Staff
  • This offer matches our previous Frontpage Deal from April 2026.
  • Rated 4.7/5 stars (740+ reviews) and 4.8/5 stars (1,450+ reviews) by Costco members.
  • $20 manufacturer's savings is valid through 8/2/26. While supplies last.
  • If you don't have a Costco Warehouse Membership, you can sign-up here
  • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by gmfitzg2
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has for Costco Members: 2-Pack Winix Replacement Air Purifier Filters (various) on sale listed below for $59.99. Shipping is free.

Thanks to Community Members gmfitzg2 for sharing this deal.

Available:Features:
  • True-HEPA Filtration
  • Captures up to 99.97% of Particles as Small as 0.3 Microns
  • Activated Carbon Filters: Reduces VOCs and Odors from Cooking, Pets, and Smoke

Editor's Notes

Written by Wiznaz | Staff
  • This offer matches our previous Frontpage Deal from April 2026.
  • Rated 4.7/5 stars (740+ reviews) and 4.8/5 stars (1,450+ reviews) by Costco members.
  • $20 manufacturer's savings is valid through 8/2/26. While supplies last.
  • If you don't have a Costco Warehouse Membership, you can sign-up here
  • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by gmfitzg2

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20 Comments

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Jul 26, 2026 10:52 PM
4.8K Comments
Joined Jan 2007

This comment has been rated as unhelpful by Slickdeals users.

Jul 27, 2026 1:13 AM
31 Comments
Joined May 2013
Frostking79Jul 27, 2026 1:13 AM
31 Comments
Quote from geoffkin :
Ouch, how often do people change these? I sure feel sorry for people that don't have clean air to breathe!
That's 2 years worth
Jul 27, 2026 1:18 AM
2.1K Comments
Joined Feb 2007
techie333Jul 27, 2026 1:18 AM
2.1K Comments

Our community has rated this post as helpful. If you agree, why not thank techie333

Outrageous what winix is charging for these
1
Jul 27, 2026 1:21 AM
144 Comments
Joined Dec 2009
reckless37Jul 27, 2026 1:21 AM
144 Comments
Many less expensive generic options on Amazon...
1
1
Jul 27, 2026 5:40 PM
407 Comments
Joined Feb 2017
siricepickJul 27, 2026 5:40 PM
407 Comments

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

Quote from reckless37 :
Many less expensive generic options on Amazon...
Yeah, but Project Farm found many of those generic ones to be poor in filtration
3
Jul 29, 2026 3:27 AM
1.5K Comments
Joined Feb 2017
mixpieJul 29, 2026 3:27 AM
1.5K Comments
Quote from reckless37 :
Many less expensive generic options on Amazon...
You get what you paid for. Genuine replacement is less than $3 for one month.
Pro
Jul 29, 2026 4:53 AM
2.1K Comments
Joined Jun 2011
mkdenar
Pro
Jul 29, 2026 4:53 AM
2.1K Comments
Quote from siricepick :
Yeah, but Project Farm found many of those generic ones to be poor in filtration
I read up on this didn't watch it, his testing methods for this are heavily criticized for this video.

If there is a PM meter in your house you can monitor it directly, or sensor in the unit set it to auto and forget it (I only recommend these and will only buy these)
Similarly, the DIY options with 120/140mm PC fans is the cheapest and most reliable. Probably pair it with a Ikea ALPSTUGA (now $35) and a tp-link p110m ($28/4-pack) to a matter thread to trigger it yourself.

But I've got two winix C545 (one bearing starting to get annoying I'm going to try and DIY repair) and two C610 (just bought another from costco as I saw it was 99.97 and had the star of death) and only bought generics for the C545 (replaced them when the app called for it since they are like $6/each)
Last edited by mkdenar July 28, 2026 at 10:00 PM.

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Jul 29, 2026 2:02 PM
367 Comments
Joined Mar 2014
SteakNCheeseJul 29, 2026 2:02 PM
367 Comments
Quote from Frostking79 :
That's 2 years worth
Unless you have 2 cats, then its 6 months worth.
Jul 29, 2026 2:03 PM
367 Comments
Joined Mar 2014
SteakNCheeseJul 29, 2026 2:03 PM
367 Comments
Quote from techie333 :
Outrageous what winix is charging for these
Buy the knock offs on amazon.
Jul 29, 2026 2:05 PM
367 Comments
Joined Mar 2014
SteakNCheeseJul 29, 2026 2:05 PM
367 Comments
Quote from mkdenar :
I read up on this didn't watch it, his testing methods for this are heavily criticized for this video.

If there is a PM meter in your house you can monitor it directly, or sensor in the unit set it to auto and forget it (I only recommend these and will only buy these)
Similarly, the DIY options with 120/140mm PC fans is the cheapest and most reliable. Probably pair it with a Ikea ALPSTUGA (now $35) and a tp-link p110m ($28/4-pack) to a matter thread to trigger it yourself.

But I've got two winix C545 (one bearing starting to get annoying I'm going to try and DIY repair) and two C610 (just bought another from costco as I saw it was 99.97 and had the star of death) and only bought generics for the C545 (replaced them when the app called for it since they are like $6/each)
I have done the bearing replacement and it has been flawless for over 2 yrs. Need a soldering gun btw.
Jul 29, 2026 2:11 PM
656 Comments
Joined Nov 2011
MusicsAllWeGotJul 29, 2026 2:11 PM
656 Comments
Quote from mkdenar :
I read up on this didn't watch it, his testing methods for this are heavily criticized for this video.

If there is a PM meter in your house you can monitor it directly, or sensor in the unit set it to auto and forget it (I only recommend these and will only buy these)
Similarly, the DIY options with 120/140mm PC fans is the cheapest and most reliable. Probably pair it with a Ikea ALPSTUGA (now $35) and a tp-link p110m ($28/4-pack) to a matter thread to trigger it yourself.

But I've got two winix C545 (one bearing starting to get annoying I'm going to try and DIY repair) and two C610 (just bought another from costco as I saw it was 99.97 and had the star of death) and only bought generics for the C545 (replaced them when the app called for it since they are like $6/each)
Sucks when Costco stopped carrying the 545.
Bought the 610 and I'm honestly not a fan of it.
Definitely did not like the way the filters were stuck together, very much prefer the 545 filter setup.

Quote from SteakNCheese :
I have done the bearing replacement and it has been flawless for over 2 yrs. Need a soldering gun btw.
Good to know!
Jul 29, 2026 2:18 PM
367 Comments
Joined Mar 2014
SteakNCheeseJul 29, 2026 2:18 PM
367 Comments
Quote from MusicsAllWeGot :
Sucks when Costco stopped carrying the 545.
Bought the 610 and I'm honestly not a fan of it.
Definitely did not like the way the filters were stuck together, very much prefer the 545 filter setup.


Good to know!
I checked a few months back and on Winix's website you could still buy them.
Jul 29, 2026 2:36 PM
186 Comments
Joined Mar 2020
JollyHose932Jul 29, 2026 2:36 PM
186 Comments
Been using generic "cheap" ones from Amazon for my coway for the past 6 years. No issues and there is no dust on my fan blades. Lots of dust and hair on my filters so they do the job. Cant speak for anything smaller the eye can't see.
Pro
Jul 29, 2026 7:34 PM
2.1K Comments
Joined Jun 2011
mkdenar
Pro
Jul 29, 2026 7:34 PM
2.1K Comments
Quote from SteakNCheese :
I have done the bearing replacement and it has been flawless for over 2 yrs. Need a soldering gun btw.
Damn thought just soldering iron would do the trick. Might do more research and see if I can find a deal on one, or if a hair dryer would work as a heat gun type replacement :p

Quote from MusicsAllWeGot :
Sucks when Costco stopped carrying the 545.
Bought the 610 and I'm honestly not a fan of it.
Definitely did not like the way the filters were stuck together, very much prefer the 545 filter setup.

Good to know!
For the C545 I read the type of carbon filter isn't very effective and really only works for a very short period (I think 1 week) of the 3 months they stated, the charcoal filters with actual charcoal in pockets are better, so I never bought replacements for that and just vacuum out the last one when I replace the hepa :p

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Yesterday 2:26 AM
751 Comments
Joined Nov 2007
NikolaiYesterday 2:26 AM
751 Comments
Quote from mkdenar :
I read up on this didn't watch it, his testing methods for this are heavily criticized for this video. If there is a PM meter in your house you can monitor it directly, or sensor in the unit set it to auto and forget it (I only recommend these and will only buy these) Similarly, the DIY options with 120/140mm PC fans is the cheapest and most reliable. Probably pair it with a Ikea ALPSTUGA (now $35) and a tp-link p110m ($28/4-pack) to a matter thread to trigger it yourself. But I've got two winix C545 (one bearing starting to get annoying I'm going to try and DIY repair) and two C610 (just bought another from costco as I saw it was 99.97 and had the star of death) and only bought generics for the C545 (replaced them when the app called for it since they are like $6/each)
Funny I've also two C545's and one with bearing humming a bit. Wife doesn't mind it in her office tho, so ...meh?

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