Desk research only. No hands-on testing was performed by Filter Math. All social evidence is paraphrased, never quoted verbatim. Health-adjacent claims appear only as attributed owner/reviewer accounts, never as proven medical efficacy. Marketplace prices are asking prices, not completed sales. All time-sensitive facts and prices dated 2026-09-23 unless otherwise noted. UNVERIFIED marks facts that could not be confirmed from a recovered source. Seed-file attributions (market-selection file) were treated as leads, not citations; claims from it were not reused without independent recovery.
1. Disclosure
This dossier was built from independent tester reviews (breathequality, HouseFresh-adjacent coverage), spec aggregators, and a Costco listing, observed 2026-09-23, plus direct social-tool observations. Social discovery was attempted via Threads CLI, Facebook CLI, and Instagram CLI on 2026-09-23. One Facebook Marketplace listing for this model was directly observed (see Section 3). Where the seed market-selection file named a source without a URL, that claim was treated as a lead and is not cited here unless independently recovered (see private source ledger _source-ledger.md, which never ships).
2. Overview / current version
The Winix C545 is a mid-size smart purifier: strong CADR (232/243/246), Wi-Fi with the Winix app, auto mode with air-quality sensor, and Winix's PlasmaWave feature, in a tower form factor. It is often sold through warehouse clubs — Costco has listed a C545 bundle with a two-year filter supply (2 HEPA + 8 carbon filters). It sits between the 5500-2 (no Wi-Fi) and the 5510 (newer smart flagship) in Winix's lineup.
3. Social standing & validation tier
UNVALIDATED — included for comparison, low community signal.
- One direct social observation: facebook-cli marketplace search (2026-09-23) returned a listing titled "Winix C545 Air Purifier", used/like-new, asking $120, in Santa Barbara, CA, listed 2026-08-28 (listing ID 1763264188254121). This is an asking price, not a completed sale, and a single listing is weak owner signal — one attributable item, not two. Tier unchanged.
- No Threads, Instagram, or Facebook owner-group posts specific to the C545 were directly observed (Facebook groups search failed with a connector grant error — access failure, not no-results).
4. Specs
| Spec | Value |
|---|---|
| CADR | 232 smoke / 243 dust / 246 pollen |
| Room coverage | 360 ft² |
| Noise | ~28 dB at low (reviewer-reported); full band UNVERIFIED |
| Power | 65W (listed by one review) |
| Filtration | True HEPA (Filter S), carbon pre-filters, PlasmaWave |
| Filter life | ~12 months (Filter S) |
| Smart features | Wi-Fi, Winix app, auto mode, air-quality sensor, filter indicator |
| Dimensions/weight | 8"D × 14"W × 21"H, ~16 lb (per the marketplace listing's description — one seller's figures, not manufacturer-confirmed) |
5. Price observed 2026-09-23
- Current US unit price not recovered in the documented sample — UNVERIFIED. Older refurb deals exist but are not current street price. The only dated price signal is the $120 used asking price (Marketplace, 2026-08-28) — not a new-unit price.
6. Annual filter cost
- Conflicted — preserved as found:
- ~$26 indicative (one source, likely third-party filter pricing)
- ~$59/yr genuine (attributed to HouseFresh's estimate)
- $40–60 estimates (other sources)
- No single current genuine Filter S price was confirmed on 2026-09-23. The Costco bundle (2 HEPA + 8 carbon = two-year supply) is the best value hedge observed, but bundle pricing was not recovered — UNVERIFIED.
7. Included / needed
- In the box (per standard retail listings): purifier with filter set installed. App setup (Winix app) for smart features. Replacement Filter S sets are the recurring need. PlasmaWave can be disabled in settings (reviewer-noted).
8. Support & warranty
- UNVERIFIED in the documented sample.
9. Attributed owner / reviewer complaints
- PlasmaWave / trace-ozone concern: some owners and reviewers express unease about the PlasmaWave feature's ozone byproducts. This is framed strictly as an owner/reviewer concern; the feature can be disabled, and no health-harm claim is made here. (The shared source ledger records a recovered AnandTech forum thread — snippet-derived from search index, not direct post access — in which posters call PlasmaWave an add-on of dubious value and describe built-in air-quality sensors as unreliable; that thread discusses Winix models including the C545. Paraphrased only.)
- No C545-specific defect cluster recovered beyond the general Winix QC/support grumbling in that thread (attributed, snippet-derived).
10. Cross-brand comparison notes
- The C545's natural rivals are the Winix 5500-2 (same CADR class, no Wi-Fi, often cheaper) and the Coway AP-1512HH (similar CADR, no app). The C545's differentiator is app/Wi-Fi control at a mid price; its filter-cost picture is the murkiest of the three (see conflict above). No current measured three-way test was found in the documented sample.
11. Community verdict
Low community signal with one honest data point: a used unit asking $120 suggests real-world resale well below typical new-unit pricing, but one listing is not a market. Filter-cost uncertainty and the PlasmaWave question are the two things a buyer should resolve before purchasing.
12. Sources (dated)
| Source | Observed | Supports |
|---|---|---|
| https://ca.alphachooser.com/air_purifiers--winix_c545--air_purifier-specs-and-profile | 2026-09-23 (search snippet) | Spec profile |
| https://breathequality.com/winix-c545-review/ | 2026-09-23 (search snippet) | Independent review; PlasmaWave disableable; ~28 dB low; 65W |
| https://www.costco.ca/p/-/winix-c545-air-purifier-with-true-hepa-filter-set/4000175806?DM_PersistentCookieCreated=true&langId=-24 | 2026-09-23 (search snippet) | Costco bundle: 2 HEPA + 8 carbon (two-year supply) |
| https://forums.anandtech.com/threads/anyone-use-air-purifiers.2592960/ | 2026-09-23 (recovered via one bounded web search; snippet-derived from search index, NOT direct forum access) | Posters critical of PlasmaWave value, built-in sensor reliability, Winix QC/support (thread discusses C545/5300-2). Paraphrase only |
| facebook-cli marketplace search, query "Coway air purifier" | 2026-09-23 (direct observation) | "Winix C545" listing: used/like-new, asking $120, Santa Barbara CA, listed 2026-08-28, ID 1763264188254121 — asking price only |
13. UNVERIFIED / open gaps
- Current US new-unit price: UNVERIFIED.
- Current genuine Filter S price and the $26/$59/$40–60 conflict: unresolved — UNVERIFIED.
- Full noise band, warranty/support terms: UNVERIFIED.
- Direct owner posts (beyond one marketplace listing): not found in the documented sample.
- No measured head-to-head test vs. named rivals found in the documented sample.