At the time of research, this product is $45 lower (29.03% savings) normally priced for $154.99 (as part of Winix Spring Sale sitewide)
About the Deal
The Winix C535 offers true HEPA filter that captures 99.99% of airborne allergens including pollen, dust, smoke, pet dander and other ultrafine particles (as small as 0.003 microns) w/ PlasmaWave Air cleaning technology
Recommended for medium size rooms (up to 1776 sq. ft
Offer valid while promotional price/supplies last
Additional Details
Product is eligible for hassle free returns w/ purchase
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At the time of research, this product is $45 lower (29.03% savings) normally priced for $154.99 (as part of Winix Spring Sale sitewide)
About the Deal
The Winix C535 offers true HEPA filter that captures 99.99% of airborne allergens including pollen, dust, smoke, pet dander and other ultrafine particles (as small as 0.003 microns) w/ PlasmaWave Air cleaning technology
Recommended for medium size rooms (up to 1776 sq. ft
Offer valid while promotional price/supplies last
Additional Details
Product is eligible for hassle free returns w/ purchase
The Winix C535 is a long running True HEPA purifier that stands out for durability, strong filtration, and simple operation. The prefilter catches a lot of dust and helps protect the HEPA, and the larger Filter A cartridges are said to last well and often go on sale. The C535 also avoids the C545 WiFi feature, which is described as unnecessary, while matching it on air cleaning, noise, and power use. The main cautions are filter compatibility, since C535 and C545 filters are not interchangeable, and some units can develop motor noise after years of heavy use. A solid pick if you want a proven, no frills purifier with the right filters on hand.
people who want a Winix that can run almost 24/7 for years because one buyer says their C535 has been running nearly 24x7 for 7+ years and is still working perfectly.
homeowners who already know they need "Filter A" for the C535 because commenters say C535 uses Filter A/21 and the filters are not interchangeable with other models, so matching the correct filter type by model matters.
buyers who plan to keep replacing filters long-term because multiple commenters report genuine Filter A for the C535 often goes on sale ($20-$30 for about a year supply), while other Winix filter types don't see the same sale frequency.
people who don't care about Wi‑Fi smart features because commenters say the C535's performance/noise/power are essentially the same as the C545, and they specifically call the C545 Wi‑Fi unreliable/useless.
renters or DIY-minded users who want a purifier with a prefilter that helps protect the HEPA because one commenter prefers it to their Corsi boxes since the prefilter catches a lot and helps protect the HEPA.
buyers comparing this to Costco bundles because one commenter says Costco previously had the C535 on sale for $99 with two sets of filters, while this package includes only one set, so it may not be the best value versus that prior deal.
people who want to buy refurbished only if it's in great condition because a commenter says the refurb option's condition is "fair" and recommends spending the extra $35 for a new unit instead.
buyers who need a purifier that will be quiet indefinitely if they run it 24/7 because commenters report the motor can start squealing after a couple of years and becomes annoying enough to require replacement.
people who are sensitive to early reliability issues because one commenter says a related Winix model (5510) had issues since day 1 with an annoying noise, making them cautious about similar units.
buyers who want to avoid any risk of motor-bearing wear over time because a commenter reports a common issue on older Winix models where motor ball bearings can wear out and develop a grinding sound after several years.
It can run for years: one unit has been used almost 24/7 for over 7 years and still works perfectly, and several others have run 27/7 for 6+ years. A reported weak point is the motor, which can start squealing or develop bearing noise after a couple of years or several years of heavy use.
No. The C535 uses Filter A/21, while the Costco C545 uses Filter S, and they are not interchangeable. Buyers should match filters by model number before ordering replacements.
Yes. Genuine Filter A replacements often go on sale for about $20-$30 for a year supply, and Amazon pricing around $26 per set was cited. Third-party carbon and HEPA replacements are also available.
The C535 and C545 are described as having similar air-cleaning performance, fan noise, and power use, but the C545 adds Wi‑Fi. The C535 is also described as better built and more reliable long term, while the C545's Wi‑Fi is called unreliable.
The refurbished Walmart option is about $75, but its condition is listed as "fair." A new unit at $109.99 costs about $35 more and avoids the refurb condition risk.
New units reportedly include extra filters, but that may not apply to refurb units. The purifier also has a prefilter that catches a lot of debris and helps protect the HEPA filter.
Is this the one you have to get filters from Costco?
You're probably thinking of the c545.
Here is info copy and pasted from Google:
The Winix C545 uses Size S filters (approx. 11 x 13.25 inches), while the Winix C535 uses Size 21/Filter A (approx. 12.6 x 16.3 inches). The C535 filter is significantly larger in surface area, and they are not interchangeable. [1, 2, 3]
Winix C545 (Size S / 1712-0096-00)
• Dimensions: H: 13.1" x L: 10.9" x W: 1"
• Fitment: Typically sold at Costco, uses a smaller filter area, often referred to as "Filter S".
• Carbon Filters: Often requires 4 charcoal pre-filters, changed every 3 months. [1, 3, 4, 5]
Winix C535 (Size 21 / 115115 / Filter A)
• Dimensions: H: 16.34" x L: 12.60" x W: 1.18"
• Fitment: Compatible with 5300, 6300, 5300-2, and P300.
• Carbon Filters: Uses a larger, thicker filter assembly. [2, 6]
Key Takeaway:Ensure you purchase the correct filter by model number. The C545 uses Filter S and the C535 uses Filter A/21. The C535 filter is larger and incompatible with the C545. [2, 3, 7, 9]
I got this one from costco over 7 years ago, and almost use it 24x7. And it is still working perfectly as of today. Also you can get 3rd party carbon and HEPA filter replacements from amazon.
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I got this one from costco over 7 years ago, and almost use it 24x7. And it is still working perfectly as of today. Also you can get 3rd party carbon and HEPA filter replacements from amazon.
It's an amazing machine. I hope they never stop making them.
The only difference between c535 and c545 is the c545 has wifi connection for smart home features. There is no significant difference between air quality performance, fan noise, or power usage. Long term value, I find the OEM c545 air filters cheaper to buy than c535 filters.
The only difference between c535 and c545 is the c545 has wifi connection for smart home features. There is no significant difference between air quality performance, fan noise, or power usage. Long term value, I find the OEM c545 air filters cheaper to buy than c535 filters.
My experience is the 535 holds up much better long term and is a more well-made machine. And the Wi-Fi of 545 is useless and unreliable.
I have both. Never use the WiFi of the C545. Have several extra of the genuine "Filter A" for the C535 because it often goes sale ($20-$30 for 1 year supply). Genuine Filter S for the C545 doesn't go on sale, but there are cheaper options third party. C535 uses larger filters which might have a slight advantage in longevity, but also makes unit slightly larger.
All I know is I have this model. I bought filters from Costco during a sale. It's literally the type I need, but somehow they are thicker than the prior filters. And it's definitely Winix branded.
Not a deal at all. Costco had this model before the C545, but Costco package contains two sets of filters for $99 on sale. This package contains only one set of filters.
Costco carried C535, then C545, and now the round one, C610. For the genuine Winix filters, Amazon has a better price for C535 (Size A) filters, $26 a set.
Last edited by MichaelM6202 March 26, 2026 at 04:28 PM.
I have 3 of these....great units. When purchased new they come with extra filters just fyi not sure if that's the case for refurb. Prefer to my corsi boxes as the prefilter catches a lot and protects the HEPA
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Condition is "fair" though. Probably best to spend the extra $35 on a new one.
Nope.. got it today.. its brand spanking new ..in a brand new sealed box... trying to attach a picture of it slickdeal not allowing me to . I will be happy to email it though to anyone interested.
Last edited by beakeru2 March 26, 2026 at 04:41 PM.
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Community Reviews
The Winix C535 is a long running True HEPA purifier that stands out for durability, strong filtration, and simple operation. The prefilter catches a lot of dust and helps protect the HEPA, and the larger Filter A cartridges are said to last well and often go on sale. The C535 also avoids the C545 WiFi feature, which is described as unnecessary, while matching it on air cleaning, noise, and power use. The main cautions are filter compatibility, since C535 and C545 filters are not interchangeable, and some units can develop motor noise after years of heavy use. A solid pick if you want a proven, no frills purifier with the right filters on hand.
The C535 can keep running near-continuously for years without failing, based on long-term use reports.
The C535 filter type is supported by third-party carbon and HEPA replacements, which can help with ongoing maintenance options.
The C535 often benefits from more frequent sales on genuine Filter A, which can lower long-term filter costs.
The C535 prefilter can help capture debris and protect the HEPA filter, which may improve practical day-to-day performance.
The C535 uses Filter A/21 and filters are not interchangeable with the Costco C545's Filter S, so model confirmation is required.
The C535 motor can develop squealing noise after a couple of years, which may require a replacement if the sound becomes annoying.
The C535 may share a motor bearing wear issue seen on older Winix models, and repairs can be difficult due to required tools.
A refurbished option can arrive in fair condition, so it may be better to pay extra for a new unit if condition matters.
Common Questions (6)
AI-generated summary based on comments from the community. Updated ago
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Here is info copy and pasted from Google:
The Winix C545 uses Size S filters (approx. 11 x 13.25 inches), while the Winix C535 uses Size 21/Filter A (approx. 12.6 x 16.3 inches). The C535 filter is significantly larger in surface area, and they are not interchangeable. [1, 2, 3]
Winix C545 (Size S / 1712-0096-00)
• Dimensions: H: 13.1" x L: 10.9" x W: 1"
• Fitment: Typically sold at Costco, uses a smaller filter area, often referred to as "Filter S".
• Carbon Filters: Often requires 4 charcoal pre-filters, changed every 3 months. [1, 3, 4, 5]
Winix C535 (Size 21 / 115115 / Filter A)
• Dimensions: H: 16.34" x L: 12.60" x W: 1.18"
• Fitment: Compatible with 5300, 6300, 5300-2, and P300.
• Carbon Filters: Uses a larger, thicker filter assembly. [2, 6]
Key Takeaway:Ensure you purchase the correct filter by model number. The C545 uses Filter S and the C535 uses Filter A/21. The C535 filter is larger and incompatible with the C545. [2, 3, 7, 9]
AI can make mistakes, so double-check responses
[1] https://www.reddit.com/r/AirPurif...nix_
[2] https://www.amazon.com/Colorfulli...B0
[3] https://www.amazon.com/JORAIR-Rep...B09KFS4JW
[4] https://www.amazon.com/Cabiclean-...B09T9974GG
[5] https://www.youtube.com/watch?v=Tx_jy2X
[6] https://www.amazon.com/APPLIANCEM...B0
[7] https://www.facebook.co
[8] https://www.winixameric
[9] https://www.gemefindust
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Costco carried C535, then C545, and now the round one, C610. For the genuine Winix filters, Amazon has a better price for C535 (Size A) filters, $26 a set.
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