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The Winix 9800 is Winix’s large-room flagship, and it is one of the few purifiers in its price range that gets the fundamentals right: AHAM-verified CADR, True HEPA filtration, and a 500-square-foot rated room size, with Wi-Fi and app control thrown in. It typically sells for around $329, with drops to $279 on sale, which puts it in direct competition with the Coway Airmega AP-1512HH Mighty below it and the Levoit Core 600S and Blueair Blue Pure 211i Max beside it.
After comparing its published specifications, AHAM verification, and independent test data, our verdict is that the Winix 9800 is a strong buy for large bedrooms and living rooms up to 500 square feet — with one caveat. Its CADR is lower than the Blueair 211i Max and the Levoit Core 600S at a similar price, so if raw cleaning power per dollar is your priority, those two edge it out. But if you want AHAM-verified performance, a washable pre-filter, and Wi-Fi scheduling in a proven design, the 9800 is hard to fault.
Winix 9800 at a Glance
| Spec | Detail |
|---|---|
| CADR (smoke / dust / pollen) | 323 / 336 / 384 CFM |
| Room size (AHAM-verified) | 500 sq ft |
| Filtration | 4-stage: washable pre-filter, activated carbon, True HEPA, PlasmaWave |
| Particle capture | 99.99% of particles as small as 0.003 microns |
| Noise level | 26.2 dB (lowest setting) |
| Power consumption | 95 watts |
| Fan speeds | 4 + auto mode |
| Dimensions | 23.2″ H x 11.8″ W x 16.5″ D |
| Weight | 19 pounds |
| Smart features | Wi-Fi, Winix Smart app, Amazon Alexa |
| Certifications | AHAM Certified, CARB Certified, UL Certified, Energy Star |
| Warranty | 2-year limited |
| Typical price | Around $329, as low as $279 on sale |
Design and Build
The Winix 9800 is a tall, slim tower in matte black, 23.2 inches high, 11.8 inches wide, and 16.5 inches deep, weighing 19 pounds. It has a carrying handle on top, which matters more than it sounds — at 19 pounds this is a purifier you will want to move between rooms, and the handle makes it a one-hand job. The front panel is a clean touch interface with fan speed, auto mode, timer, and PlasmaWave controls, plus a small air-quality indicator light.
The build is solid without being heavy, and the black finish hides dust better than the white towers that dominate this category. It needs 12 to 18 inches of clearance from walls for maximum airflow, per the manual, so it is not a unit you can push flush into a corner. The 2-year limited warranty is standard for the category — shorter than Coway’s 5-year warranty on the Airmega 400, but longer than Levoit’s 2-year coverage on the Core 600S.
Filtration: 4 Stages, and What Each One Does
The Winix 9800 uses the same 4-stage system as the rest of the Winix line, and it is a genuinely good one:
Stage 1 — Washable fine-mesh pre-filter. Catches pet hair, dust, and large particles before they reach the main filter. Rinse it under water every couple of weeks and it lasts the life of the machine. This is the feature that keeps the running costs down.
Stage 2 — Activated carbon filter. Reduces VOCs and household odors from cooking, pets, and smoke, and helps prolong the True HEPA filter’s life. Replace it every 3 months — the shortest interval in this purifier, and the one owners most often forget.
Stage 3 — True HEPA filter. Captures 99.99% of airborne allergens including pollen, dust, smoke, and pet dander, down to particles as small as 0.003 microns. Lasts about 12 months under normal use.
Stage 4 — PlasmaWave. Winix’s ionizer technology, which the company says helps break down pollutants at a molecular level. It can be switched off, and we recommend leaving it off: the HEPA filter does the real cleaning, and ionizers can produce trace amounts of ozone. The purifier works perfectly well with PlasmaWave disabled.
Performance: CADR, Coverage, and Noise
The numbers that matter are independently verified. The Winix 9800 is AHAM-verified with a smoke CADR of 323, dust at 336, and pollen at 384, and AHAM rates it for rooms up to 500 square feet. That means it delivers 5 air changes per hour in a 500-square-foot room — the standard allergists recommend. Winix also claims it cleans rooms up to 2,420 square feet in one hour, but that is the one-air-change figure and should be ignored for sizing purposes.
In practical terms, the 9800 is a strong performer for a large bedroom or a living room. Independent analysis of its AHAM data puts it at about 8 air changes per hour in a 300-square-foot room, which is excellent — the air in a typical bedroom is fully exchanged roughly every 7 to 8 minutes on high. Noise is 26.2 decibels on the lowest setting, quiet enough for a bedroom, rising to the mid-50s on the highest speed. At 95 watts on high it is not the most energy-efficient purifier in its class — the Blueair 211i Max does more cleaning on 46 watts — and Consumer Reports puts its annual electricity cost at about $85 and its annual filter cost at about $80.
Smart Features and App
The Winix 9800 has Wi-Fi built in, and it connects to the Winix Smart app for iOS and Android, with Amazon Alexa voice control. Through the app you can change fan speeds, set schedules, check the filter life, and monitor air quality remotely. The app is genuinely useful for scheduling — set the purifier to run on high while you are at work and drop to sleep mode before bedtime — but it is not required. Every function is also available on the touch panel, so the purifier works fine without a phone.
One note: the 9800 has a VOC sensor, not a full PM2.5 particle sensor, and its air-quality display is a simple indicator rather than a numeric readout. If you want precise PM2.5 numbers on the machine itself, the Levoit Core 600S or the Coway Airmega 250S give you more detail.
Winix 9800 vs the Competition
Winix 9800 vs Coway Airmega AP-1512HH Mighty. The Mighty is cheaper at $229.99 and has a similar CADR (233 smoke vs 323), but it covers only 361 square feet to the 9800’s 500, and it has no Wi-Fi. If you want app control and a bigger room, the 9800 wins. If you want the best value and do not care about Wi-Fi, the Mighty wins.
Winix 9800 vs Levoit Core 600S. The Core 600S has a higher CADR (410 smoke) and a lower price ($299.99), plus dual PM2.5 and VOC sensors. But its CADR is manufacturer-stated, not AHAM-verified, and its filter is HEPA-grade only in sleep mode. The 9800’s AHAM verification and true HEPA at all speeds make it the safer choice for allergy households.
Winix 9800 vs Blueair Blue Pure 211i Max. The Blueair has a higher CADR (410) and uses half the power (46 watts vs 95), and it typically costs less at $250 to $300. But its HEPASilent filtration is not a traditional H13 True HEPA design, and its AHAM verification status has been disputed by independent reviewers. The 9800’s AHAM-verified True HEPA is the more conservative, more verifiable choice.
Winix 9800 vs Winix 5510. The 5510 is the successor to the discontinued 5500-2, with a smoke CADR of 253 and a price of $179.99. It is the better buy for rooms under 400 square feet. The 9800 is the better buy for rooms between 400 and 500 square feet, where the 5510 runs out of headroom.
Pros and Cons
Pros:
- AHAM-verified CADR of 323 smoke, 336 dust, 384 pollen
- 500-square-foot rated coverage at 5 air changes per hour
- 4-stage filtration with a washable pre-filter
- Wi-Fi, app, and Alexa control with scheduling
- Quiet 26.2-decibel low speed
- CARB, UL, and Energy Star certified
Cons:
- Lower CADR than the Blueair 211i Max and Levoit Core 600S at a similar price
- 95 watts is thirsty compared with Blueair’s 46 watts
- Carbon filters need replacing every 3 months
- PlasmaWave ionizer adds nothing and should be left off
- No numeric PM2.5 display on the unit
Who Should Buy the Winix 9800?
Buy the Winix 9800 if you have a large bedroom or living room between 400 and 500 square feet, you want AHAM-verified performance you can check independently, and you value Wi-Fi scheduling. It is also a good pick for allergy households, because its True HEPA filter works at full efficiency on every fan speed — something not every competitor can say.
Skip it if your room is under 400 square feet — one of the best air purifiers under $200, such as the Winix 5510 at $179.99, does the same job for less — or if maximum CADR per dollar is your priority, in which case the Blueair 211i Max and Levoit Core 600S both deliver more cleaning power for similar money. And if your room is over 500 square feet, step up to the Coway Airmega 400, which covers 1,560 square feet at 2 air changes per hour. Our full Coway Airmega 400 review covers that upgrade in detail. For smoke-heavy regions, our guide to air purifiers for wildfire smoke compares the strongest models for that job.
Frequently Asked Questions
Is the Winix 9800 a good air purifier?
Yes. It is AHAM-verified with a smoke CADR of 323, covers 500 square feet at 5 air changes per hour, and uses a 4-stage True HEPA filtration system. Independent analysis rates it A- among air purifiers in its class. Its main weakness is value: the Blueair 211i Max and Levoit Core 600S offer higher CADR for similar money.
How big a room does the Winix 9800 cover?
AHAM verifies it for rooms up to 500 square feet. Winix also claims it cleans up to 2,420 square feet in one hour, but that is the one-air-change figure. For allergy-level performance at 5 air changes per hour, use the 500-square-foot number.
How often do I replace the Winix 9800 filters?
The washable pre-filter should be cleaned every 14 days and never needs replacing. The activated carbon filters need replacing every 3 months. The True HEPA filter lasts about 12 months. The filter indicator on the panel lights up when a change is due — and knowing how often to clean an air purifier filter, starting with a monthly vacuum of the pre-filter, stretches every filter’s life.
Should I leave PlasmaWave on?
We recommend leaving it off. The True HEPA filter does the actual cleaning, and PlasmaWave is an ionizer that can produce trace amounts of ozone. The purifier performs exactly the same with it disabled, and the button on the panel makes it easy to switch off permanently.
Does the Winix 9800 work with Alexa?
Yes. It connects to the Winix Smart app for iOS and Android and supports Amazon Alexa voice control for fan speed and power. Google Assistant is not officially supported — if you are a Google Home household, the Levoit Core 600S is a better fit.
Is the Winix 9800 better than the Winix 5500-2?
The 9800 covers a bigger room (500 vs 360 square feet) and adds Wi-Fi, but the 5500-2 was discontinued in May 2025, so the comparison is mostly academic. If you already own a 5500-2, Winix guarantees replacement filters through 2032. If you are buying new, the choice is between the 9800 and the 5510, the 5500-2’s successor.
The Bottom Line
The Winix 9800 is a thoroughly good large-room air purifier with honest, independently verified numbers and a filtration system that does what it claims. At around $329 it is not the cheapest way to get a CADR over 300 — the Blueair 211i Max and Levoit Core 600S both beat it on raw power per dollar — but it is the most verifiable pick in its class, with AHAM certification, CARB certification, and a washable pre-filter that keeps running costs down. For a 400 to 500-square-foot bedroom or living room, especially in an allergy household, it is an easy recommendation. For smaller rooms, save the money and buy the Winix 5510. For bigger rooms, step up to the Coway Airmega 400.