Winix
Winix 5520
$259.99Cheaper
Released 2022
Best Air Purifiers · head-to-head
Winix 5520 vs Dyson Purifier Big+Quiet Formaldehyde BP04
A sourced, side-by-side comparison. Winix 5520 is cheaper at $259.99. Every spec and price links to its source.
Dyson
Dyson Purifier Big+Quiet Formaldehyde BP04
$1199.99
Released 2023
Which is better: the Winix 5520 or Dyson Purifier Big+Quiet Formaldehyde BP04?
On the specs we track, they're closely matched. The Winix 5520 is the cheaper at $259.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Winix 5520 | Dyson Purifier Big+Quiet Formaldehyde BP04 |
|---|---|---|
| US price | $259.99 | $1199.99 |
| Brand | Winix | Dyson |
| Released | 2022 | 2023 |
| Cadr smoke (CFM) | 253 | — |
| Coverage (sq ft) | 392 | — |
| Hepa | Yes | Yes |
| Filter type | Fine Mesh Pre-filter + AOC Carbon + True HEPA + PlasmaWave (4-stage) | 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter |
| Noise db min | 23.5 | — |
| Smart | Yes | Yes |
| Energy star | No | No |
| Release | 2022 | 2023 |
Sources — Winix 5520: winixamerica.com (verified 2026-06-15). Dyson Purifier Big+Quiet Formaldehyde BP04: dyson.com (verified 2026-06-15).
What's the difference between the Winix 5520 and Dyson Purifier Big+Quiet Formaldehyde BP04?
Where the two actually differ on the specs we track (1 of 7). Matching specs are omitted.
- Filter type: Winix 5520 Fine Mesh Pre-filter + AOC Carbon + True HEPA + PlasmaWave (4-stage) vs Dyson Purifier Big+Quiet Formaldehyde BP04 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Winix 5520
Only one whitelisted tester (Wirecutter) hands-on tested the exact Winix 5520, and only in its dismissed-competition section: a capable purifier that tested worse and louder than Coway's Mighty 2, with a dark, monolithic form that stands out in most rooms, a display that shuts off only on the lowest and least effective fan speed, and an ionizer that reactivates on every power-on. No lab numbers were published for this model. (1 sourced review, 1 lab-tested.)
Praised: Capable air-cleaning performance.
Flagged: Tested worse than, and louder than, Coway's Mighty 2; Display only shuts off on the lowest, least effective fan speed; Reverts to its ionizing function on every power-on.
Dyson Purifier Big+Quiet Formaldehyde BP04
Three whitelisted outlets (TechRadar, Reviewed/USA Today, TechHive) hands-on or lab tested the Dyson Purifier Big+Quiet Formaldehyde; TechRadar and Reviewed covered the higher CO2-sensor trim (aligned with BP04) while TechHive tested the base Formaldehyde unit. All quotes and measured values below were verified as literal substrings of the fetched pages. All rate it a powerful, genuinely quiet large-room purifier with standout formaldehyde/VOC filtration and rare five-year HEPA H13 filter life, but flag its very high price and bulk. Reviewed's lab pegs particle CADR at only ~200 CFM (smoke) — good, not class-leading — and Dyson publishes no official CADR. (3 sourced reviews, 3 lab-tested.)
Praised: Best-in-class formaldehyde/VOC chemical filtration; Powerful; cleans very large open-plan spaces; Acoustically quiet despite its power.
Flagged: Very expensive; costs a small fortune; Big, heavy and bulky (26 lbs, ~33 in tall); Produces a strong, physically noticeable airflow/wind nearby.