Blueair Blue Signature Large (SP4i) vs Winix 5530
Blueair Blue Signature Large (SP4i)
The short answer
Blueair Blue Signature Large (SP4i) comes out ahead overall with 7.8/10 against 7.6/10 for the Winix 5530. Blueair Blue Signature Large (SP4i) is stronger on noise at sleep-usable speeds, cleaning performance for bedroom size and sleep-friendly features. Winix 5530 is stronger on indoor-air safety & materials, running cost & ownership and value. At current verified prices, the Winix 5530 costs about $220.00 less.
- Choose the Blueair Blue Signature Large (SP4i) if: Light sleepers with a large primary bedroom who will pay for the most quiet airflow and accept an always-on ionizer.
- Choose the Winix 5530 if: Sleepers dealing with cooking, smoke or pet odors who want a carbon-pellet filter for under $180.
Scores by criterion
| Criterion | Blueair Blue Signature Large (SP4i) | Winix 5530 |
|---|---|---|
| Noise at sleep-usable speeds | 9.3HouseFresh: 229 cfm at 40 dB, 34.8 dB in sleep mode. | 7.4RTINGS (search snippet only): 32.4 dBA on low; quiet-speed airflow not confirmed on an opened page. |
| Cleaning performance for bedroom size | 9.0455 smoke CADR rated; 229 cfm measured at a quiet 40 dB. | 7.0253 cfm CADR is reached only at about 60.7 dBA; about 122 cfm under 45 dBA per an unopened RTINGS summary. |
| Sleep-friendly features | 8.3Night mode, laser PM2.5 sensor, app. | 7.6Sleep and auto modes plus app control. |
| Indoor-air safety & materials | 5.0Ionizer cannot be switched off (HouseFresh). | 7.2Switchable, CARB-certified PlasmaWave; it may re-enable after a power loss. |
| Running cost & ownership | 5.5About $180 a year in filters (HouseFresh). | 8.0Filter Q is widely stocked; 65 W max. |
| Value | 5.8$439.99 on Amazon. | 8.5$179.99 sold by Amazon. |
Specifications
| Spec | Blueair Blue Signature Large (SP4i) | Winix 5530 |
|---|---|---|
| Workflow type | — | Standard Room |
| Lowest-speed noise (manufacturer) | 23 dB | 23.5 dB |
| Top-speed noise (manufacturer) | 55 dB | — |
| Lowest-speed noise (independent measurement) | 34.8 dBA | 32.4 dBA |
| CADR (smoke where given, else headline) | 455 cfm | 253 cfm |
| Recommended room size (4.8–5 ACH / AHAM) | 705 sq ft | 392 sq ft |
| Max power draw | — | 65 W |
| Sleep / night mode | Yes | — |
| App control | Yes | Yes |
| Ionizer / electrostatic stage | Ionizer that cannot be disabled (per HouseFresh) | PlasmaWave ionization, switchable |
| Filter type | 7-stage filter incl. pelleted carbon | Washable pre-filter + activated carbon pellets + True HEPA (Filter Q 1712-0123-00) |
Blueair Blue Signature Large (SP4i)
Pros
- 34.8 dB in sleep mode
- About 229 cfm at 40 dB
- Large coverage
- App control and PM2.5 sensor
- Doubles as a side table
Cons
- Ionizer cannot be turned off
- Premium price
- About $180 a year in filters
- Tabletop surface scratches easily
The quietest high-airflow option for a big room, but only for buyers who accept the always-on ionizer and the cost.
Full Blueair Blue Signature Large (SP4i) review →Winix 5530
Pros
- Carbon-pellet filter for odors
- Switchable, CARB-certified ionizer
- App control
- Lower price
- Large coverage rating
Cons
- Loud at max, about 60.7 dBA
- Quiet-speed airflow less established
- Ionizer may re-enable after power loss on earlier models
A good choice when odors are the main problem, and a reasonable bedroom unit overall, provided you leave the ionizer off.
Full Winix 5530 review →Both products are part of our guide The Best Quiet Air Purifiers for Bedrooms of 2026, where you can see every pick, how we score and current prices from each retailer.