Winix has long been the quiet overachiever in air purification, and the AM90 represents their push into connected smart purifiers. At $199.99, it undercuts most Wi-Fi-enabled competitors while delivering the same True HEPA and PlasmaWave combination that made the Winix 5500-2 a bestseller. Four months of daily testing reveal whether the smart upgrade is worth the premium over its analog sibling.
Design & Build
The AM90 shares its DNA with the 5500-2 but refines the exterior. It is a flat panel design measuring roughly 15 x 8 x 24 inches, with a dark charcoal finish and a fabric-textured front grille. The overall aesthetic is a noticeable step up from the utilitarian 5500-2. It would not look out of place in a modern living room or home office.
The top panel features touch controls with an LED display showing real-time air quality on a four-color scale. A light sensor automatically dims the display at night, a small but thoughtful feature for bedroom use. The rear panel provides easy filter access with a snap-off cover.
Build quality is typical Winix: solid without being premium. The plastic housing has no flexing or rattling, and the unit feels well-assembled at 15 pounds. It is not going to win design awards, but it blends in comfortably.
Smart Features & Connectivity
The Winix Smart app provides a solid connected experience:
- Real-time air quality index displayed in the app and on the unit
- Remote fan speed control and mode switching
- Scheduling with different profiles for weekdays and weekends
- Filter life monitoring with push notifications for replacement
- Amazon Alexa and Google Assistant voice control
- PlasmaWave toggle via app
Voice control works reliably with both Alexa and Google. "Alexa, set the air purifier to sleep mode" and "Hey Google, turn up the air purifier" both responded consistently in our testing. The app also supports multiple units, useful if you have Winix purifiers in several rooms.
The Wi-Fi setup process took under three minutes with no hiccups, which is better than several competitors that required multiple attempts or specific network configurations.
Air Cleaning Performance
The AM90 uses Winix's proven four-stage filtration: washable AOC carbon pre-filter, True HEPA filter, PlasmaWave ionizer, and the fine mesh housing that catches large debris. PlasmaWave generates hydroxyls that break down odors, allergens, and some VOCs at a molecular level without producing harmful ozone. Winix's PlasmaWave is CARB-certified for ozone safety.
| Metric | Result | Rating |
|---|---|---|
| PM2.5 Reduction (30 min) | 96% | Excellent |
| VOC Reduction (60 min) | 79% | Good |
| Pollen Simulation | 98% | Excellent |
| Dust CADR | 228 | Above Average |
Performance is nearly identical to the 5500-2, which is a compliment. The 228 CADR handles rooms up to 360 sq. ft. effectively. In our 300 sq. ft. living room test, the AM90 brought PM2.5 from 35 to under 5 in about 20 minutes on high speed. PlasmaWave's contribution is difficult to isolate in particle testing, but odor reduction was noticeably better with it enabled, particularly for cooking smells.
Noise Levels
| Speed | Measured dB | Subjective |
|---|---|---|
| Sleep Mode | 27 dB | Very quiet |
| Low | 32 dB | Soft hum |
| Medium | 42 dB | Moderate white noise |
| High | 53 dB | Noticeable fan |
| Turbo | 60 dB | Loud, for quick cleaning |
The AM90 matches the 5500-2's noise profile closely. Sleep mode is quiet enough for light sleepers, and the auto dimming display eliminates any light disturbance. Turbo mode is loud but only needed for rapid air clearing after cooking or other high-emission events.
Running Costs
- Energy: ~$2-4/month
- True HEPA filter: ~$40 every 12 months
- AOC carbon pre-filter: Washable, replace ~$20 every 3 months or wash monthly
- Annual filter cost: ~$80-120/year
Winix's 12-month HEPA filter lifespan is a genuine advantage. Most competitors require replacement every 6-8 months. The washable carbon pre-filter extends the HEPA filter's life further by capturing large particles and odors before they reach the main filter.
Pros and Cons
What We Like
- +Wi-Fi with Alexa and Google support at under $200
- +Same strong CADR as the 5500-2
- +Smart auto mode with air quality sensor
- +PlasmaWave can be toggled off
Could Be Better
- −App is basic compared to Levoit VeSync
- −PlasmaWave produces trace ozone
- −Design is boxy
Winix AM90 vs. Winix 5500-2
The smart upgrade vs. the proven classic:
Choose the AM90 if you want app control, voice assistant integration, and remote monitoring without a significant performance tradeoff. Choose the 5500-2 if you want the same core filtration at a lower price and have no interest in smart features.
The Verdict
The Winix AM90 is the best value in Wi-Fi-connected air purifiers. It takes the proven filtration performance of the beloved 5500-2 and adds reliable smart features, a better-looking design, and voice assistant support for a modest price increase. The 12-month HEPA filter life keeps long-term costs reasonable, and PlasmaWave adds odor-fighting capability that pure HEPA units lack.
At $199.99, it competes with purifiers that cost $100 more for similar connected features. If you want a smart air purifier without paying the smart premium, the AM90 is the one to buy.
Rating: 4.5/5
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