9800 4-Stage True Hepa Air Purifier with WiFi and PlasmaWave, 500 Sq Ft,Black,Large

First, I selected this based on Consumer Lab's ranking of it as runner-up to its #1 Large Space filter. The #1 selection was a ridiculous $600-$800 while this was nice $230 on sale (vs $399 normal). Heck, make this #1. Key features: (1) It has wifi-enabled companion app - but you can control it entirely from the air purifier itself which is good because frankly being able to avoid potentially cyber insecure IOT app for somethign that's largely unnecessary is great. (2) It automatically turns on plasma ionization when you turn it on, but you press the up & down (fan speed) buttons simultaneously for 3 seconds to turn it off. (3) If you run it on auto, when the lights are off (photo-sensitive not motion detection sensitive), it'll power down into ultra-low speed fan mode. Easy solution, turn off auto and leave it in low fan speed. Our dog farts like she's eaten deer poop. It's either get rid of the deer or the dog (joking), but we love our girl too much. Then there's the crawlspaces that were never encapsulated that give the house a musty smell while we're waiting to get them encapsulated this summer. And the skeptical husband. Enter this air purifier. It has approximately 5 air changes per hour for a 600-something SF space if I remember correctly. Within 30 minutes of turning it on, husbando and I noticeably detected fresher air throughout the house. Low and medium fan speeds aren't overly loud, and actually pleasantly low-key background noise. Even the high-speed is not particularly abrasive or overstimulating for you sensory-sensitive people. Plus it gives you 3 carbon filters from the start, each of which lasts 3 months if I remember correctly. So, all in all, super happy with this. Some reviews mentioned the LED light wasn't reliable - but someone who shall not be named (cough, the dog) audibly farted right in front of the purifier when she was sleeping (comically whoopee-cushion like which, if we couldn't breath immediately at least this time it was not because it was noxious but because we were laughing so hard) and the LED indicator IMMEDIATELY turned red. Ran for 5 minutes then the indicator went back to blue. Super great at dust removal, and our nostrils have been less congested between weekly house deep cleaning too.

Purchased 6 months ago to help cut down on house dust and possible cat allergens though mostly because my better half has been wanting one for awhile and I finally broke down. Runs very quiet for the most part except rare occasions when auto fans goes in high mode which is pretty brief. Sensor works well to keep it quiet at night so no problem leaving it in bedroom. I think it is actually doing something because the filters need regular cleaning. It is pretty large but a handle on top makes it easy to lift and move around. The important thing is my wife believes it's helping with the dust. Easy to keep clean and replacement filters are reasonably priced. I plan to purchase another so I can leave one in bedroom and one downstairs.

Much better than a couple smaller, less expensive units i recently bought but, they're good enough to serve their purpous in the other rooms. Much quieter than a larger one i've had for years... this one goes in my bedroom for sure... It's VERY quiet even on fan speed 2 {can fall asleep with it 4 feet from bed} ... On sleep mode, not audible from 4 feet (my ears) at all and can barely hear anything standing right over it. Even at max fan speed the sound is not obnoxious at all while listening to music or TV the "hshshsh" sound fades into the background very quickly. However, setting 1 or 2 moves plenty of air in my room for 24/7 use... well designed. I suspect why it's so quiet is why it's bigger and heavier (as well as whatever airflow engineering from R&D) is reason it is so quiet and yet moves LOTS of air. I suspect more room for sound deadening materials, larger fan motor and fan-wheel plus, large surface area filters makes for higher airflow at lower RPM fan speeds. Comes with One HEPA filter and 4 activated charcoal filter. The HEPA and one of the charcoal filter comes sealed in plastic already installed {don't forget to take the plastic off before use :} the other 3 come in a large resealable plastic bag {nice touch}. My environment is only moderately dusty so i suspect the filter "could" last for longer than recommended but, they are not that expensive so I think I'll replace them as required. As for "Plasmawave" ... there are some reviews that think (among other thing) that it "generates UV radiation" {huh?) or OZONE... Plasmawave was one of the thngs that also attracted me to WINIX. I actually had posted a review for the 9800 a couple days ago , but like a dummy, i posted a link directly to the WINIX website "Plasmawave technology FAQ page" that describes exactly what Plasmawave is and does... I recommend anyone "theorizing" what it is go vist that page... PSA: As for misinformed reviews i've read about Plasmawave... In air-purifiers that have "non-ionising" UV-C lamps, you are not exposed to anything anyway, since the bulbs are inside the unit closed off to direct UV exposure... However, "Plasmawave" has exactly "zero" UV bulbs. And as for those that think they are being exposed to toxic levels of ozone, there are safety regulations and this is NOT an "Ozone Generator" it is a type of "air ionizer" but not a conventional one... to learn more, go to the WINIX website. Great design. Great Technology. Recommended.

I purchased this Winix 9800 air purifier to replace a BlueAir 311 Auto. I was tired of always cleaning that annoying cloth filter on the BlueAir, plus taking that purifier apart to change the filters and reassembling is such a pain. Also, the BlueAir sensor sucks as it only a handful of times in four years ever increased the speed or showed a light other than blue. This Winix air purifier is SUCH a huge upgrade. The product is substantial and very well made. Installing the filters was a breeze and the buttons/app work great. Regarding the PlasmaWave feature, go to the Winix website as the Amazon page doesn’t describe this in detail. The product comes with FOUR replacement charcoal filters (which can't be washed and are supposed to be replaced every three months) plus the HEPA filter lasts a year, so you have what you need out-of-the-box for a full year. The sensors on this Winix air purifier are very sensitive and are constantly ramping up the airflow and turning amber or red. I feel like this is the first air purifier I've bought that actually works! I did a side-by-side comparison of air movement with the BlueAir 311 Auto and the Winix 9800 is about twice as powerful....moves double the amount of air. On the lowest setting there is a slight hum from the unit but it's barely noticeable. Regarding the auto sleep function - the Amazon website doesn't describe this well. The purifier will go into sleep mode ONLY if it's set to Auto and the lights are turned off. If you have the purifier set to a higher speed (meaning not in Auto mode) it will NOT go into sleep mode if you turn the lights off. So for those looking for something that moves a lot of air or creates white noise to sleep, this is for you! Of note is the fact that the blue/amber/red light will not dim unless it's in sleep mode so if the light bothers you while trying to sleep, you'll likely need to turn the purifier away so it's not shining in your eyes. Lastly, before purchasing this I did research for a medical-grade air purifier. IQAir, NuWave and Austin Air were the ones I was considering. In reading online reviews, these products all work similarly, just the aforementioned ones are needlessly expensive (and ugly!). Getting a HEPA filter that can remove contaminants down to .003 microns is what is important and the Winix does this! Of note is the Amazon websites for the Winix products give misleading numbers regarding the actual microns. Look on the Winix website at either the product page or their filter replacement and you'll see that they ALL use high quality HEPA filters that remove particles down to .003 microns. Get this product, it's affordable, elegant, powerful, and actually works!

Pros - This purifier "moves" air, and it does it quietly. Unlike other units I've tried the sensor in this unit actually works ! When it goes to red - "poor air", the fan speed turns up to high. It will turn yellow and the fan speed lowers, then when it senses clean air it switches to blue and the fan speed goes back to one. In the evening, as the room gets darker, the sensing light will go out. I guess they feel it will bother sleeping if used in a bedroom. At first I thought the unit was shutting off, but the fan was still running on low with the light out. It came alive and kicked up the fan speed when it detected poor air as it should. I like the multiple filters in the unit. We notice a big improvement in air quality including dust on furniture. The intake area on this unit is huge compared to other units. Cons - I downloaded the App to use Alexa. The App works on the phone to control the unit, but it will "not" work with Alexa. When asking Alexa to function the unit, it says purifier not responding. It seems to recognize the unit, but just won't control it. Customer service tried to guide me through a cure, but all efforts were fruitless. They couldn't even figure it out. We deleted and reinstalled the Apps a couple times. We don't really care if Alexa controls the unit, but if you are a Alexa die hard, good luck. Other than that, we have no other Cons ! We've been running it a couple weeks now and we are very happy with it. Will update review if anything develops. I gave it 4 stars because of the Alexa issue, but as far as cleaning the air performance, it's a definite "5".

I love this air purifier. It’s very quiet when running on auto. The build quality is excellent and it’s very stylish in my living room. We noticed an immediate improvement in our air quality after installing this unit. The filters are high quality and easy to change. When we start cooking, it automatically kicks into high performance mode and quickly works to clean our air. Sleep mode is great. I cannot hear the unit running when it goes into sleep mode. The “smart” aspect of this unit works great. It was easy to connect to the app. The app needs a little work. I want to have the ability to add a custom name to the unit within the app. The generic standard names don’t work well if you have multiple units. Having the name bedroom 3 or more times isn’t helpful when you want to identify a specific bedroom. We love this unit and have purchased several other smaller models from this company and placed them throughout the house.

I have 3 of these Winix PlasmaWave air purifiers in my 800 sq ft apartment. All three are different models, but they all work great. My apartment has a mold issue, and the smell in the summer time was really bad. The landlord installed a window unit in the wall, and I believe it is leaking water inside the wall. It took me 2 years to figure out where the smell was coming from because I'm not able to see the mold, only smell it. These air purifiers greatly reduced the smell in my apartment, now I just need to get the source of the mold addressed.

*** 1 YEAR LATER UPDATE: I've been using this for a year, changing filters and cleaning it regularly. Suddenly this week it started putting off a BURNING SMELL when turned on. I think the engine must be overheating!!! :( I can't return it now so I guess it's just trash. What a waste of money for a potential fire hazard. Also the app refuses to connect to my wifi anymore, no matter what I do. So I have been unable to put the filter on a schedule for about the past 8 months. I wish I hadn't wasted my money. *** I’m 100% happy with this purchase. My friend has a $500 fancy high tech purifier, but he’s jealous of mine now. The filters are a standard rectangular size so they’re very affordable. It stands relatively compactly near the wall. Takes up less space and is quieter than my living room fan. I was able to hook up the app with no issue and easily set a schedule. It is WHISPER QUIET!!! Even on turbo it just sounds like a big fan blowing, no loud sounds. After only a day I noticed how clean the air in my house smells whenever I come home. I keep it on auto all day with an hour of turbo scheduled when I’m out of the house (everyone in my home has allergies). I’ll update my review when I get the power bill. I love how the light sensor automatically puts it to sleep at night. This thing is so handy! Now on the bad, I only have 2 smallish issues… The app REQUIRES you to give permission to use your exact location just to use it. I don’t know if that is worth using it to create a schedule. I’ll probably delete it for that reason. I hope they make this optional in the future. And the “PlasmaWave” ionizer is a feature I honestly didn’t notice in the product description. FYI if you don’t know: ionizers put off UV radiation and is not advisable to be used indoors at all. If you have asthma or breathing issues it can make them worse or it can give them to you if you don’t have them. Luckily the UV can be aired out of your home over time or with open windows. Ionizers luckily don’t put out THAT MUCH UV but it’s still not recommended to use at all when you’re in the home. I settled on turning on the plasmawave about once a month for an hour, when I’ll be out of the house for at least 2 hours. Glad that I can easily just turn it on or off. I recommend this product very highly. The price may seem large for basically a big fan with a filter on it, but it’s so quiet and has exactly as many features as it needs. Nothing too fancy. Just a good machine that does what’s needed. I can literally forget that it even exists because it’s on a set schedule and I don’t hear it! So happy to score this well on a large online purchase. :)