I have owned this product for less than 24 hours as of this writing. More updates as I have more to say/remember to do them. Also, I will be very verbose, the sort of in-depth information I want when I am researching products over $99 for purchase, so you really know what's going on. Hopefully it helps, but it may be TL;DR for some. My background: I am not a smoker and never have been. I was raised by a chain smoker and have spent the majority of my life around second hand smoke from parents, family and friends. I have stress induced asthma and have also been through experimental chemotherapy that has apparently permanently damaged my lungs. Over time, my lungs are slowly degrading, and as they do I become more and more sensitive to more and more things, which trigger my lungs to get irritated and produce phlegm to coat my lungs and prevent the irritation, which causes me to cough more and more over time. (It has been a lot of fun having this sort of lung disorder during the pandemic, let me tell you.) "Well, why don't you see a doctor then?" you may reasonably ask. My experience with doctors in the past has consisted of watching both my mother and grandmother die with (no joke) 30+ prescriptions each all at once (with 3 to 5 doctors all prescribing simultaneously and admitting to me in private that A) they were not consulting with one another, and B) nobody on earth could possibly keep track of the side effects of so many prescriptions at once), and my uncle wasn't far off that number when he died. I also have repeated personal experience with the medical industry that strongly supports my experience and belief that going to the doctor is going to be a financially insane choice (whether or not I have insurance) that I get little to nothing out of regardless. So I choose to avoid doctors and the medical/drug big business establishment like the plague whenever possible. When I realized recently that my lungs were noticeably irritated all the time when I was in my own home, but I was fine if I went outside, I decided it was time to step up my game. Enter this unit, which I researched before buying. My unit is brand new, not a returned unit. Upon turning it on, it told me that my air in all areas of the house tested was as good as it gets, with a reading of 001. This did not please me, because I know it's nowhere near that good. So I did an update of the firmware to see if that would fix the issue, and it did. The new display read 005, which was significantly lower than I expected, but the unit reduced that to 3, then 2, then 1 relatively quickly. Within about 15 minutes, the air in my (door closed) office started to smell noticeably different. Lighter, cleaner, fresher, more neutral. I was surprised. I also noted that over the next few hours, my coughing decreased significantly as long as I stayed in my office. When bed time came, I put the unit in my bedroom and turned it on full blast with the doors closed while I went to the kitchen to have a snack. At first, the bedroom registered 5. The unit quickly brought it down to 1. I noted that my coughing increased when I was in parts of the house that had not had the benefit of this device to clean the air. Returning to my bedroom after my snack, I noted that once again, there was a nice difference in how the air smelled in my bedroom compared to my kitchen. Normally it takes me a while to stop coughing enough to fall asleep when I got to bed each night, but last night while there was still coughing before sleep, it was markedly less, which my girlfriend commented on today. This morning, I woke up to the pleasant realization that my lungs did not feel irritated for the first time in a long time. I hadn't even realized how irritated my lungs were when I would usually awaken until it was gone. Moved the unit into my home office again, and turned it back on. It started at 5, and again rapidly cleaned the air until it was at 1. Then I began doing more experiments. I noted that when the AC kicks on, it goes from 1 to 2 or 3. When it turns off, the unit returns it to 1. When I open the door to my office, it goes to 2, and then back to 1 when I close it. When my cat walks into my office, it goes from 1 to 2 if I close the door after him, and stays there for as long as he is moving around. If I pet him, it goes to 3. Thinking this level of sensitivity was too good to be true, I decided to try further experiments. I closed my office door again, waited until it settled down, and sprayed some air freshener in my office. No change - it evaporated. Just as expected. Then I went down the hall and into my living room and lit a stick of natural compressed sandalwood powder incense. I returned to my office and closed the door. Within 2 minutes, this unit detected the incense in the air, rising to a 4-5-6 and then back to 3 when the AC turned off. The next AC cycle, it jumped into the teens, and then into the 20's, 30's, 40's as the smoke got going during the next cycle. When the count hit 45, it turned the ring green and stepped the fan up a notch. I found that I could watch the numbers go up when the AC was on, and down when it was off. It got up to around 86 at one point, and the ring sometime before that turned orange and stepped the speed up another notch. Now that the incense has burned out, it's dropping, with highs in the 50's, and lows i the 20's and cycling lower each time the AC kicks on again. It's been interesting to see it power up and down to match the particulates in the air. Build quality seems good, but the bottom can come off easier than I'd like. A couple times now I have tried to lift it only to find that it had un-screwed and the bottom and filter were not lifted with the rest of the unit. Easily fixed in a second or less, but if the bottom had a bit of "click into place", this would not happen when moving the unit. It is so quiet in sleep mode that last night when we went to bed, after I had it running on high for a few minutes while we had our snack before bed, that even three feet from it, my girlfriend could not tell if it was running and asked. This was with the AC not active. That's pretty darned quiet. It also was no issue for me to handle, and I am extremely sensitive to sound when I am trying to sleep. The top two levels of fan speed are relatively loud, with the highest speed being louder than my AC when it's kicked in. It is, however, the most smooth and beautiful white noise I have ever encountered, and I am an audio engineer. So far my experience with this is almost entirely good. Here;s what I don't like. 1. The bottom unscrews too easily. No big deal, but irksome. 2. The sensor didn't work when I got it until I updated the firmware, which forced me to download the app, sign up, and then give the app location permissions and blue tooth permissions. I also naturally had to sign it into my wifi network. I didn't want to use the app, or give the app these permissions. The app, however, will not run without them. Ostensibly, it uses location data to give you a report on local 2.5um particulate levels in your area (which it does), but I don't know what else it is being used for, and I don't much like having my location tracked by Google and every other company on earth these days. So far so good. It appears that particulates in my house are probably not as much of an issue as what those particulates are made of, and that I need to be more focused on reducing VOCs in the air in my house. But so far this unit has helped me breathe significantly better, and I'm very happy with how well it works.

I bought this for a small 100ft2 bedroom, overkill, I know, but that is the point. The bigger the unit, the more efficient it is, so I can get away with using a lower fan speed. This is ideal since it is quieter and won't get dirty as quickly due to the lower speed; also, if I need to clean the air ASAP, this purifier can do it quickly. Although, it is a bit louder than the 400s. It also has the same variety of modes and settings to tinker with and the device is pretty easy on the eyes. The app used to control the device is also very well made, which I found a bit surprising since companion apps tend to be mediocre at best. However, the air sensor is not the most reliable since it only detects the air in the immediate vicinity, but I knew this before purchasing it. For a more accurate air quality level, I suggest a separate air quality detector. The filters are also on the pricier side, but they supposedly last 6 months. After two weeks of use, mine is hardly dirty and I have a dog, a bird, as well as a steady flow of food odors. Overall, I am satisfied with the performance, it leaves my room with the faint smell of a freshly cleaned hotel room. The purifier also does does not emit ozone, if that is a concern. It was for me due to my pets as well as general health concerns.

Back in 2016 I spent a $849 on a competing air purifier for a large room. It was okay, except when it went into high-speed mode, at which time it sounded like an old DC-3 taking off. Annoying when it happened in the middle of the night. Plus the replacement filters were expensive. Next, the sensor would change it to high speed and it wouldn't turn off, disturbing sleep. You had to literally unplug the machine. I tried following the instructions for cleaning the sensor and it still would not turn off. So I did some research, and found a website called housefresh.com, which highly recommended the Levoit air purifiers. First of all, the one for a large room was less than half the price of the competitor. Next, the filters were much less expensive. But mostly, I have been happy with the fact that it's up-to-date technology, so that I can monitor things from my phone, and schedule it to turn on and off during the day. It also provides data on the air quality on my phone, something which the old machine didn't do. And lastly, it's very quiet in the automatic mode, which is where I leave it all the time. You can turn it up to high speed if you want and it's definitely louder (but still not nearly as loud as the old machine), but I see no reason for the high-speed mode. When I first got it, I ran it once for an hour at high speed to clear out the room, and it's been on automatic ever since.

The title says a lot. Fantastic, reliable, easy, informative, accessible. The app works (almost) top notch. What I really appreciate is that they are spot on reliable using wifi apps at any location away from my house to inside my house. Their response time is fast from the app. Scheduling, setting up smart home features all run well through the app, easy to learn and use. I will be buying more, trying to get a friend to get one (two). No regrets buying them. Not so great things that I wish they’d develop or get rid of: Adding ability to control locally through Bluetooth (or zigby or z-wave) and not only through wifi and the cloud. This was problematic when internet was cancelled or interrupted. Thankfully they kept their schedules, but I had to run them on phone wifi hotspot to access them through the app. The base units work manually, but will keep the schedule in the app, unless you do a full reset. The app room arrangement doesn’t really work, and their readings don’t exactly match or refresh. (But this is in development, but probably won’t take off.) I do not like that the app can be an bit invasive on every part of my privacy/life. Like trying to get me to buy into their health tracking logging what I eat, or making it mandatory to set location etc. in setup. The ploy to be there for health to basically gain marketing data. Too many apps and even work apps play this game and it’s a bit deceptive marketing data gathering. I’m totally techy smart home and software junky, but there’s a clear line that is getting crossed. The company sends me prodding emails to track my health. I cannot get rid of the icon in the app, wish it wasn’t a part of this. That was negative, Back to positive. Because they are fantastic. I’ve watched every YouTube video on all the brands repeatedly. I now have 4 of these and a few smaller finer filter ones from Medify, and two Winnix 5500’s. The Levoit are hands down my favorite. They are quiet and easy over wifi. I’ve turned my non-smart Winnix to smart by adding switch bots to them, but the Levoit are smart from the start. The smaller med brand one cannot be turned smart as there’s no place to put switchbots on them. They get too loud in medium and high, so I will not buy that brand again, keep with the Levoit. (Possibly try Austin Air someday, but that’s just more money.) Levoit is Not glitchy. A favorite feature when I’m cooking in the kitchen is the number and color reading. It shoots up so fast when cooking certain ways or foods. It’s funny because a Winnix will turn orange or red in a heartbeat when I pour alcohol in a glass 4 feet away in front of it! But it doesn’t provide a number, which the Levoit 600 shows. These filter the air so well, that when I drop peppermint oil at doorways or spots in a room (deters spiders and I think ants, I use a lot on a sailboat. Works like a charm), if my Levoit is running, it removes the essential oil smell too fast. Way too fast. It’s a battle I will not win if I run these air filters, because they work so well.

Solid build. Good construction. Easy to replace filter. Quiet. Love to app. Easy to use. Digital readout allows you to monitor progress. Amazed at how sensitive the readout was to simple things like cooking in another room. Upon increased reading, the fan speeds up until the number goes back down. Fan changes are super quiet, you don’t even know the fan is running. It works and works well. Hardest thing is remembering to shut it off if you open the windows (no sense filtering the universe and using up your filter capacity scrubbing the neighborhood air LOL). I bought a second unit based on satisfaction. Can’t comment on odor reduction, but it certainly excels at particulate removal and I love the fact I can read the level on the meter.

I bought two and, so far, I am extremely happy with my purchases. I have one in my livingroom and one in my children's room. They're whisper quiet, very nice and sturdy. Easy to set up and connect to with an app and to my existing Alexa units. The app is easy and simple to use with built in settings for auto off and on so you don't need to program a long tedious schedule of off times and on times. I noticed a measurable difference with the 24 hours I've had them. My house smells fresher and cleaner. I returned home from a quick errand and the house didn't smell. (You know it's bad if you smell your own house.) Prior to receiving them, I did a thorough dusting, vacuuming and shampooed the carpets. My house was long overdue for a deep clean. I and my family were waking up with headaches, coughing, sneezing, just overall feeling unwell for what seems like years. Falling asleep was difficult due to an indescribable uncomfort too. I had the idea it is probably the dust build up, as one night I finally had a clearing of my sinuses and I smelled old dusty dust really thick. And I'm not one to dust often which is not good but lesson learned. I live in a 100 year old craftsman house on a gravel driveway on a very busy countryside road. We have a dog and 2 cats and they are about 70/30 indoor outdoor pets respectively. It gets dusty and grimey and there are so many places for that dust creep in and settle. We also have wildfires in our area that become so thick with unhealthy levels of smoke and particles. I'm beyond happy and comforted knowing I have these quality machines to help keep our home clean, fresh a most important healthy. I will update as time passes. But so far km loving these air purifiers.

LEVOIT Air Purifiers for Home Large Room Up to 1980 400s model is quiet, even on middle fan mode you can hardly tell it's on. Huge filter with plenty of surface area that has a cleanable pre filter. Lasts literally a year or more without replacing. Auto controls will auto set speeds as it's dust laser detects particles in the air. Pulls very little power & energy star rated. I keep it on medium 24x7 and so far so good. I would recommend it for living room or bedroom and must have for a dorm. This thing is hepa rated and catches mold etc.

We live in the desert so I bought this to remove some of the dust that gets into the house. It works great. It removes almost all the dust and any dusty smells that go with it. It is a larger machine and can remove almost all the dust in half of the whole house. I put it on high in the morning when I get up. Within an hour I kick it down to "Auto" mode as it has lowered the dust to almost nothing. Auto mode controls the fan according to how much dust it senses. It works very well. The sleep mode drops it so quiet I have to check it sometimes to see if it is actually running. The Wifi just makes it easier so I don't have to get up to change it. I can just pull it up on my phone and use the app to adjust it. We just bought this so its not been used enough to rate durability. It seems to be well built, but only time will tell. Its not cheap enough to just go out and buy another if it dies, so I'm hoping it lasts. Further posts will be made if it breaks.

We purchased one of these on sale in the hope it would help moderate the severity of pollen season in upstate NY and the dander generated by two large labradors. It has a nice, clean look and small foot print, which we feel is important. The HEPA filter was shipped inside it in a bag that needs to be removed but doing so was incredibly quick and easy to do. Twist the top a quarter turn and place to one side. Lift out the filter, remove the bag, lower the filter back in using the two tabs provided on it for that purpose, lift the lid back on and quarter twist to close. It takes 2 mins. Then its' plug-in, turn on and choose ""Auto" or a fan speed using the touch sensitive panel on top. You can control it from your iphone if you're into that but it certainly isn't necessary. The first thing we noticed is how quiet it is. Effectively soundless in sleep mode and at fan speed 1. Barely noticeable at fan speed 2, unless you're right next to it, noticeable at fan speed 3 when you are in the same room as it but not obnoxious. Noticeably louder at fan speed 4 which should be considered a 'Turbo" mode. Then we noticed the impact of running it - vastly reduced swelling of the eyes and sinuses of those suffering from hay fever and a significant reduction in the doggy smell of our labradors. It works really well. We have taken advantage of the ability to control this by iPhone to set a schedule where it automatically runs in sleep mode (low, continuous fan) from 10pm to 5am. Then at fan speed 2 from 5am to 5:30am, ramping up to fan speed 3 from 5:30am to 8am before switching to auto from 8am to 10pm. Because of the relatively severe allergies suffered by a couple of our family members the P2.5 micron threshold is set to 2 ug per meter cubed and this filter has been able to attain that incredibly low level with that schedule within a few hours of all windows and doors to the outside being closed to the 1800 sq. ft area it services. At this point we have an oasis for our hay fever sufferers to return to each evening and it's made an incredible difference to their comfort. Do they still take Claritin or Allegra during pollen season? Yes, we've found it necessary to deal with the pollen at work and in the garden. Are they doing better than they were before we got this filter? Yes, the continuously swollen and itchy, weeping eyes are gone. The inflamed nasal passages are gone. Their sleep deprivation is gone. Their quality of life has improved dramatically. We had no idea how dramatic an impact adding a quality, appropriately sized HEPA filtration system would have. This unit is rated for something like 3000 sq. ft. We're using to control air quality in a 1800 sq.f.t open plan area and its doing a great job of that without having to run the fan at high speed for prolonged periods of time. We've had this for several weeks now and experienced 1st hand how well it can deal with really terrible air quality when the smoke from the fires in Quebec blew into NY. Opening the door to come into the house with the shopping during the worst of it briefly dropped the air quality from a PM2.5 of 001 to as high as a PM2.5 of 185 within 12 feet of the door. This was then quickly reduced to a PM2.5 of less than 20 in an hour and back to 001 in about 2 hours after the door was closed. The outside airs PM2.5 was apparently North of 300 at this time (sources accuweather and the news), the air was literally a hazy brown like smog and this filter was able to detect it, automatically adjust its fan speed to clear it and maintain perfect air quality in the house. Does it work? Absolutely, quietly and brilliantly. Would we buy this again? Yes, in fact we have so that we can control the air quality for one of our allergy sufferers in another area where they have to spend prolonged periods of time. That one's been in place for about 3 weeks and has done exactly what we hoped it would do - improve the quality of life at work in a 7000 sq.ft. open plan office area. Now this is well beyond the manufacturers claimed coverage for a unit and it looks like they're right based on who's apparently benefiting and who isn't but here's the important point. The benefits to the workforce have been so noticeable to management they're now considering upgrading the offices HVAC system to include HEPA filtration. I think that speaks volumes.

I have used this for 5 months. I’ve used it 2.5 months in my 350 square foot bedroom, and another 2.5 months for my 650 square feet living room. Yes, I know this is rated for like 400 square feet, but here’s my review anyways. So here are the summary PROS and CONS, if you’d like to skip all the extensive details I will be going into… PROs: - Has auto sensors - Has quick timers on it that include 1h, 2h, 4h, and 8h - Has 4 fan levels - High CADR of 403, which means it is for large spaces and performs at 5x air changes per hour (ACH) at max of 403 sq ft. - Carries easily from room to room - Turn on/off display - Design/aesthetics - Price point with its features are incredibly competitive compared to products in the same exact level (as in, this would have been a lot more expensive because of its features) - Filters quite well - Keeps smoke and odor at bay - We love fan setting 2 to use for sleep - Vesync integration (Levoit’s app that controls everything by Levoit) - Alexa integration - Apple’s Home integration - Along this line, pretty sure it will connect with many other smart homes, like Google - Vesync app itself is probably in a whole other category of PROs because it’s actually really great - Vesync app tracks both indoor AND outdoor PM2.5, so you can see a history of air quality both inside and outside your house. - Vesync app lets you set up smart scenes from within the app, so you can program it to do anything when any condition is met - Vesync app has been frequently updating to be better and to support more, so there’s ongoing improvements beyond what I consider to be really great already. - No deceptive ads for this listing; it tells you exactly how many sq ft it covers based on industry standards of 5x air changes, and not based on 1x air change. CONs: - Doesn’t filter allergens as well as some other brands do, like Coway. - Another brand may be much better for people who suffer from pet allergens. - The bottom comes off sometimes when moving it around. - Vesync app does not always update air purifier immediately. - Vesync programming scenes can be finicky and not always work as intended. - Noise level on the highest setting is very loud (but so are pretty much ALL air purifiers set on highest). NEITHER Pros nor Cons: - Price of replacement filters (costs about $49.99/6-12 months) REVIEW: I REALLY wanted to love this air purifier. For the price, it had absolutely everything I wanted, especially the auto sensors and app integrations. It honestly did extremely well in almost all areas, except for the fact that as allergy-sufferers, this just did not work as well as I thought it would. My wife is the one who suffers from pet dander, pollen, and dust, and gets asthma from extremely bad air. For her, the air purifier didn’t make a difference at all. I’m pretty okay and just suffer the occasional seasonal allergies, so I couldn’t really tell if it was making a difference for me or not. All I could tell was that from the filters, I could see that fur and dust was getting sucked up. When I cleaned it every month, it collected a lot of stuff. So that’s good! On that note though, no, air purifiers are not meant for fur and won't help with fur. I used to think air purifiers helped keep the fur at a minimum, but nope, doesn't help at all. I have a husky... I still gotta vacuum every day cuz the fur is still everywhere. Anyways, the purifier would also automatically kick on when we fried food in the house or stir fried anything on a skillet. On very rare occasions, the forest fire smoke would come all the way from the next state over and the purifier would sense this smoke and also kick on. I was very happy with that. I tried this Levoit’s air purifier for a total of 5 months. 2.5 months in my 350 square foot bedroom, and another 2.5 months in my 650 square foot living room. It worked pretty much the same in both areas. I couldn’t tell much of a difference at all. However, I also tried Coway’s Airmega AP-1512HH for the same amount of time. I alternated between these two air purifiers for 2.5 months at a time in the bedroom and living room as well (total of 5 months). And Coway’s air purifier was the one that actually made a difference for my allergies. For my wife, it only helped a little, but for me, I could tell a difference in as little as 10-15 minutes when Coway’s was turned on high. Even though the Airmega was rated for 350 square feet, it still made a difference in my 650 square feet living room. The airflow on this thing is amazing as well; I could feel it's airflow on high from across the room! I have so many good things to say about Coway's Airmega, but the huge tradeoff is that it isn't Wi-fi enabled. Levoit's Wi-fi capabilities plus the app made such a big difference in convenience and scheduled cleanings, that I really wanted to hate Coway's Airmega. I can't, however, deny that Coway's helped my allergies. One day after coming home from an incredibly windy day out, we both started feeling increasingly stuffier (with headaches and migraines coming on) as the evening came to a close downstairs in the living room where the Levoit air purifier was. The sensor on the Levoit shows the air was still excellent, so we just thought we were exhausted from being outside for too long. We did not take any meds. We just headed upstairs to go to bed, where the Coway air purifier was. Pretty much in 15-20 minutes with Coway purifier on high, our stuffiness eased and we could finally breath without straining, and our headaches and migraines lifted. Like magic. Allergy meds don't even work that fast sometimes. That was probably one of the very few times that we could actually compare the two air purifiers because it made such a huge difference. All the other days, our air upstairs and downstairs were usually both very equal and neither purifiers made much difference (to the point that made me feel like air purifiers are just myths sometimes, but obviously isn't). So, after 5 months of trying BOTH these products where both have very similar CADR, I came to the conclusion that I will be sticking the Levoit in an area that has the least traffic since it doesn’t help much for allergy-sufferers. As a purifier for smoke and odor, this is actually a pretty good one though. When I cook and this turns on, my house smells less – although it doesn’t completely eliminate the smell. In fact, neither the Coway nor the Levoit was able to completely eliminate smells (but that was not my concern at all). The best thing about the Levoit, and I feel is the biggest selling point, is that it’s Wifi-enabled for an amazing price. The app is so dang good and useful that you can set this to turn on 4 times a day at 1 hour every time (or however many times a day for however many hours you want!), or control it from across the world, or set it to turn on and clean the air right before you come home. It is so handy! Plus, it works really well with Alexa. And the auto sensors do actually work really well. At the end of the day though, my purpose for buying this were for allergies. Coway won in the area of purifying enough to help allergy-sufferers and auto-sensing. I don’t know how, but the sensors on the Coway are much more sensitive than Levoit’s; so sensitive, that opening a door activates Coway’s, while Levoit's sensors tells me that the air quality is still excellent. Now, I wasn’t here to review Coway at all, but I couldn't give a review of Levoit's air purifier without comparing the two. Looking at other people's reviews about how Levoit's air purifier helped with their allergies and such though, made me feel like either I got a defective device from Levoit, or our allergies are actually much more severe than the regular folks with allergies. Anyways, given that Levoit gave me no relief from my somewhat allergies in comparison to the other brand that I bought and tried at the same time, I will admit that I would probably not buy Levoit’s purifiers for myself ever again. If I had a friend that just needed something to keep the air clean and somewhat help with odors, AND really wanted one that’s Wifi-enabled, I’d definitely recommend this though. The app is a game-changer, and should be given an award – it’s so good and it’s always being updated; Levoit has a ton of Wi-fi-enabled products as well and all controlled with this one app. In fact, I have a Levoit humidifier, AND I also have a different small Levoit purifier for the cat’s bathroom that works extremely well too when it comes to keeping the odor at bay (so Levoit for fighting odors seems to be working pretty well in that department). Both are Wi-fi-enabled and just a game-changer. I just wish Levoit’s purifier for my living room worked better for allergies as well, but sadly, this model just didn’t and couldn’t. Pretty disappointed. ENERGY CONSUMPTION: Auto Mode: 4w - ? Sleep Mode: 3w Fan Speed 1: 5w Fan Speed 2: 8w Fan Speed 3: 15w Fan Speed 4: 35w Product's Rated Power from product's website: 38w