Smart Air SA600 vs Winix 5500-2
Quick take: The Winix 5500-2 costs $120 less; the Smart Air SA600 moves more air (287 CADR, 24% more cleaning power); the Winix 5500-2 costs about $21 less per year in filters — over five years that often outweighs the sticker gap; the Winix 5500-2 is the quieter bedroom unit (28 dB on sleep mode); the Winix 5500-2 has a particle sensor with auto mode, so it actually responds to cooking smoke and pollen spikes on its own; the Winix 5500-2 includes an ionizer — some buyers avoid these (see its cons for the ozone note).
| Spec | Smart Air SA600 | Winix 5500-2 |
|---|---|---|
| Price | ~$280 | ~$160 |
| Rating | — | — |
| Type | Large Room | Large Room |
| CADR (smoke) | 287 CFM | 232 CFM |
| Honest Coverage (AHAM) | ~445 sq ft | ~360 sq ft |
| Claimed Coverage | 1,200 sq ft | 360 sq ft |
| Noise (sleep) | 35 dB | 28 dB |
| Noise (max) | 57 dB | 65 dB |
| Filter Cost / Year | $71 | $50 |
| Filter | Dual H13 HEPA + dual pelleted activated carbon + washable pre-filters | True HEPA + washable AOC carbon |
| Filter Life | 18 mo | 12 mo |
| Max Power | 54W | 70W · Energy Star |
| Auto Mode | Manual only | Sensor + auto |
| Ionizer | None | Yes |
| WiFi Control | None | None |
| Weight | 16 lbs | 15.4 lbs |
| Maintenance | Two H13 HEPA filters and two pelleted-carbon filters (one set per inlet) last a rated 18 months, working out to about $71/year — and washable mesh pre-filters catch pet hair before it loads the HEPAs. No app, no DRM, no subscription, no proprietary lock-in games; the unit even auto-restarts after power loss, so the intended 'smart' setup is a $15 smart plug. HouseFresh pegged 24/7 electricity at about $60/year thanks to a 53.8W max draw. | Front panel lifts off tool-free. The mesh pre-filter needs a vacuum every couple of weeks, and the washable AOC carbon filter should be rinsed and sun-dried every 3 months — that washability is why annual cost stays near $50 for the yearly Filter H kit (HEPA + fresh carbon). Wipe the sensor inlet occasionally. PlasmaWave is toggled with one button if you want it off. Winix has committed to producing 5500-2 filters through 2032 despite the model's discontinuation. |
| Warranty | 1 year (30-day money-back guarantee) | 2 years |
Pros & cons
Smart Air SA600
- ✓Excellent measured performance: 287 CFM dust CADR, 24-minute HouseFresh room clear
- ✓Best-in-class quiet cleaning — 128 CFM of PM1 CADR while staying under 45 dB
- ✓~$131/year total running cost (filters + electricity) is a fraction of premium rivals
- ✓Washable pre-filters extend HEPA life in pet households
- ✓No ionizer, no ozone, no proprietary filter DRM
- ✓B-Corp brand with published test data and a no-nonsense engineering culture
- ✓Auto-restart after power loss makes smart-plug automation trivial
- ✗No auto mode, air quality sensor, app, or sleep mode — you are the sensor
- ✗35 dB minimum is audible; there's no true whisper setting for sensitive sleepers
- ✗1-year warranty is thin next to Levoit's 2 years or IQAir's 10
- ✗Little US retail presence or review volume — it's a direct-order leap of faith
- ✗Utilitarian looks; the 1,200 sq ft claim assumes a lenient 2 ACH
Winix 5500-2
- ✓Best CADR-per-dollar in the mainstream class, per HouseFresh testing
- ✓Washable pelletized carbon filter — genuine odor removal, no extra cost
- ✓Fast, accurate auto mode with a responsive particle sensor
- ✓PlasmaWave ionizer is one-button switchable
- ✓Cheap to run: ~$50/yr OEM, filters produced until 2032
- ✓Sleep mode dims lights and drops to 28 dB
- ✓Regularly discounted to $130-140
- ✗Officially discontinued — inventory is sell-through only (successor: Winix 5510)
- ✗Loud 65 dB on turbo
- ✗2-year warranty trails Coway's 3
- ✗No Wi-Fi or app
- ✗Heavier and bulkier than the Coway at 15.4 lbs
- ✗Carbon filter must be re-washed quarterly or odor performance fades