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This Winix C545 review looks at the published specs, certifications, filter costs and owner experience for one of Winix’s most popular compact purifiers. The short answer: it offers verified, near-5500-2 cleaning power in a slimmer body, with Wi-Fi control added. It is a strong value for rooms up to about 360 square feet, provided you keep up with the carbon filter swaps.
Winix C545 review: the verdict
The Winix C545 is a smart, compact tower with AHAM Verified CADR ratings of 232 for smoke, 243 for dust and 246 for pollen. Those figures match the long-running Winix 5500-2. However, the C545 is smaller, lighter and app-connected.
It is also CARB listed and backed by a two-year warranty. The main trade-off is maintenance. Its thin carbon filters are meant to be replaced every three months, so you handle filters more often.
Overall, the C545 is an easy recommendation for bedrooms and home offices. It is especially good value when it goes on sale, which happens often.
Key specs
These values come from Winix’s official product listing. Anything the manufacturer does not publish is marked as such.
| Spec | Winix C545 |
|---|---|
| CADR (smoke / dust / pollen) | 232 / 243 / 246 cfm |
| AHAM Verified room size | 360 sq ft |
| Air changes per hour | 4.8 in a 360 sq ft room (Winix figure) |
| Filtration | Washable fine mesh pre-filter, activated carbon filter, True HEPA filter, plus PlasmaWave |
| Fan speeds | 5 |
| Noise | From 27 dB on the lowest speed (top speed not published by the manufacturer) |
| Power draw | Not published by the manufacturer |
| Dimensions (W x D x H) | 13.7 x 8.4 x 20.5 in |
| Weight | 11 lb |
| Smart features | Wi-Fi, Winix Smart app, Amazon Alexa |
| Modes | Auto mode with dual sensors, automatic sleep mode, 3-color air quality light |
| Certifications | AHAM Verified, CARB, UL |
| Replacement filter | Winix Filter S (1712-0096-00): HEPA every 12 months, carbon every 3 months |
| Warranty | 2 years |
Strengths
Verified performance in a small footprint. The C545 matches the 5500-2’s CADR ratings while standing about three inches shorter. It also weighs nearly four pounds less, so moving it between rooms is easy.
App and voice control. The Winix Smart app lets you change speed, view air quality and switch modes from your phone. In addition, Alexa support adds hands-free control.
Smart automatic modes. Dual sensors drive auto mode, so the fan speeds up when air quality drops. Meanwhile, sleep mode kicks in automatically when the room goes dark.
Low entry price. Winix lists the C545 at $189.99, but it is frequently discounted. Some retail bundles also include extra filters in the box.
Quiet low settings. Winix rates the lowest speed at 27 dB. That is quiet enough for most bedrooms at night.
Limitations
Frequent carbon filter changes. Winix recommends a new carbon filter every three months. That is more hands-on than purifiers with a single combined filter.
Thin carbon layer. The carbon filters are slim sheets. As a result, they are fine for light everyday odors but are not built for heavy smoke or strong chemical smells.
PlasmaWave ionizer. PlasmaWave is an ionizing feature. The unit is CARB listed, so it meets California’s ozone limit. Even so, some owners prefer to switch it off, which takes one button press or an app tap.
No timer. Winix lists no timer function. If you want the unit to shut off on a schedule, you will need a smart plug.
Availability varies. The C545 sometimes shows as out of stock on Winix’s own store. However, it is widely sold through big retailers.
Who it suits and who should skip it
The C545 suits anyone who wants verified HEPA performance and app control at a budget price. It is a great match for bedrooms, nurseries, dorm rooms and home offices up to roughly 360 square feet.
You should skip it if you dislike frequent filter maintenance. Also skip it if you need strong odor or smoke control. In that case, a purifier with a thicker carbon bed is a better choice. Larger open-plan spaces also call for a higher-CADR model.
Winix C545 review of filters, running cost and maintenance
The C545 uses Winix Filter S, part number 1712-0096-00. Each set contains one True HEPA filter and a four-pack of activated carbon filters. That covers one year of use.
Winix lists Filter S at $59.99, and it is often on sale for around $45. Winix also offers variants with AllergenGuard, PetGuard and SmokeGuard treatments for a little more. You can confirm current options on the official Winix C545 product page.
A simple care routine keeps it working well:
- Vacuum the washable pre-filter every two weeks or so.
- Swap in a fresh carbon sheet every three months.
- Replace the True HEPA filter every 12 months.
- Wipe the sensor openings when auto mode seems slow to react.
How this Winix C545 review was researched
We did not run hands-on tests for this Winix C545 review. Instead, it draws on Winix’s official product listing, its AHAM Verified CADR ratings, its CARB listing, Winix filter pages and recurring themes in owner feedback. We compare those numbers with similar purifiers so you can judge the Winix C545 fairly. Where the manufacturer does not publish a figure, we say so rather than guess.
Alternatives to consider
- Winix 5500-2: the same CADR ratings, a washable carbon filter and no app.
- Winix AM90: a slightly larger Wi-Fi model rated for 373 square feet.
- Levoit Core 300S: a smaller, app-connected option for compact bedrooms.
- Coway Airmega 150: a simple, stylish pick for small rooms.
- Blueair Blue Pure 211i Max: a step up for larger living spaces.
Browse more models on our Winix brand page, or read how we research and score our reviews.
Winix C545 review: FAQ
Is the Winix C545 the same as the Winix 5500-2?
No, but they share identical CADR ratings and room size. The C545 is smaller and adds Wi-Fi. The 5500-2 uses a washable carbon filter and has no app.
How often do I replace the Winix C545 filters?
Winix recommends a new carbon filter every three months and a new True HEPA filter every 12 months. One Filter S set covers a full year.
Can I turn off PlasmaWave on the C545?
Yes. You can switch it off with the button on the unit or in the Winix Smart app. The purifier still filters air normally with it off.
To wrap up this Winix C545 review: it delivers verified, mid-size-room performance with handy smart features for a modest price. If you can stay on top of the quarterly carbon swaps, it is one of the best budget purifiers you can buy.
