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💨 Elevate your air game — breathe smarter, live better!
The LEVOIT OasisMist 4.5L Smart Humidifier combines large-capacity ultrasonic humidification with warm and cool mist options, smart app and voice control, and whisper-quiet operation. Designed for large rooms up to 430 sq ft, it features auto humidity adjustment, effortless top-fill design, and an aroma diffuser for customizable wellness. Perfect for improving sleep, relieving congestion, and creating a spa-like atmosphere with minimal effort.













| ASIN | B0B1DQ8KV3 |
| Best Sellers Rank | #15,565 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #23 in Humidifiers |
| Brand | LEVOIT |
| Brand Name | LEVOIT |
| Capacity | 4.5 Liters |
| Color | White |
| Control Method | Voice |
| Customer Reviews | 4.4 out of 5 stars 10,241 Reviews |
| Filter Type | Water Filter Sponge |
| Floor Area | 430 Square Feet |
| Global Trade Identification Number | 00810043375542 |
| Included Components | 1 × 4.5-Liter Smart Warm & Cool Mist Humidifier, Aroma Pad, Cleaning Brush, Water Filter Sponge |
| Item Dimensions D x W x H | 10.8"D x 6"W x 11.97"H |
| Item Shape | Rectangular |
| Item Type Name | Auto Customized Humidity, Ultrasonic Top Fill Oil Diffuser for Baby and Plants, Quiet, 4.5L |
| Item Weight | 5.3 Pounds |
| Manufacturer | LEVOIT |
| Material | BPA-Free Meterial, suitable for babies and adults |
| Model Name | OasisMist Smart Cool and Warm Mist Humidifiers for Bedroom Large Room Home, |
| Model Number | LUH-O451S-WUS |
| Operation Mode | Ultrasonic |
| Other Special Features of the Product | Aroma Diffuser, Auto Shut Off, Easy Top Fill, Humidistat, Remote Control, Run All Night, Schedule, Smart Vesync APP, Voice Control, Warm and Cool Mist for Faster and Healthier Relief |
| Part Number | Warm & Cool Mist Top fill humidifier |
| Power Source | ETL Certified AC Power Adapter |
| Room Type | Baby,Bedroom,Bedrooms, Bedroom, Large Room, Living Room, Office |
| Runtime | 45 hours |
| Smart Home Compatibility | Smart Home Compatible |
| UPC | 810043375542 |
| Unit Count | 1.0 Count |
| Voltage | 120 Volts |
| Wattage | 12 watts |
J**E
Quiet, effective, and smart — perfect bedroom humidifier!
I'm really impressed with this LEVOIT humidifier! It works great for large rooms and the smart warm and cool mist feature is a nice touch. The quiet operation is fantastic — I barely notice it running at night, which makes it perfect for the bedroom. Setting it up was straightforward and the app connectivity works smoothly. The large water tank means I don't have to refill it constantly. Humidity levels in my home have noticeably improved and my sleep quality has gotten better. Highly recommend!
L**E
Great product, works immediately
Wow - my sleep quality went from a 2 to a 10 in my house! I wasn’t sure why my sleep was so awful and it seems new heater devices in house just fried-dried up my house. I thought it was just typical wintertime but nope- this humidifier took my rooms from 29% to 57% and I couldn’t be happier in may 30?minutes tops! . The device shows you the humidity levels, gives you cool or warm mist and three levels too. Super easy to use and clean. The sound isn’t bad but the higher the mist level the more sound you hear so I put it in low overnight. To be able to breathe fully is priceless! The thing stays lit but I just face it backward at night. I’ve run this almost continuously 24/7 since I received it and I’ve had zero issues. One of the best buys I’ve made from Amazon.
K**G
The Best Humidifier I’ve Ever Owned – Worth Every Penny! A Game-Changer for Comfort and Health
I recently bought the Levoit OasisMist 450S Smart Humidifier, and it has honestly changed our lives—especially for my daughter. She used to get sick often during the winter with constant coughing and congestion at night. Since using this humidifier, she’s not feeling nearly as sick anymore, and her nighttime congestion has improved dramatically. It even helps reduce her cough and cold symptoms within just one night. I was blown away by how fast it worked. What I Love: • Warm & Cool Mist: We mostly use the warm mist at night, and it’s been amazing for clearing up stuffy noses. The cool mist is great during the day or in warmer weather. • Smart Controls: I use the VeSync app to control everything from my phone. I can check humidity levels, set timers, or just adjust the mist level without getting up. • Auto Mode: This is one of my favorite features—it senses the room’s humidity and adjusts automatically, so I don’t have to think about it. • Large Tank & Top Fill: The 4.5L tank lasts through the night and then some. Top-filling is super convenient, and it’s easy to clean. • Quiet Operation: It runs silently, so it doesn’t disturb my daughter’s sleep at all. • Aromatherapy Option: I add a couple of drops of lavender oil at bedtime, and it helps create a calm, spa-like vibe in her room. We use the aroma box regularly, and when my daughter is sick, I put Vicks drops on aroma pad and place it near the nozzle. It works like a charm to open up her airways and ease her breathing overnight. Final Thoughts: If your kids struggle with winter colds, coughs, or nighttime stuffiness, I highly recommend this humidifier. It made a noticeable difference after just one night, and it’s now part of our daily routine. Levoit really nailed it with the OasisMist 450S—worth every penny!
V**B
Works great! Quite! Functionality locked behind an app :(
Okay, so this unit looks great, works super well, and is easy to clean! I purchased mine to help my skin in the winter/drier months. I like that it has an auto mode which maintains a humidity, different mist warmth settings, and is very quite. I DO have issues with it though. Features/functionality were purposefully left off of the actual unit in order to force buyers to use their app- yup they want access to your wifi, location, and all the other juicy privacy data they can sell; oh, and of course, when you open the app there's multiple notification marks to entice you into other menus which are advertising their other products. The unit has a sleep button- this will not work the way you think it would. It's not a setting for you to use at night when you sleep. It turns off any warmth setting, display, and runs *continually*. The first night I used it, I woke up to greenhouse of a room; when I turned the display back on, it read that the room was at 95% humidity. The sleep setting is just a low-noise, no-display mode, and needs constant tending to maintain a target humidity level- it does not auto shut off. Target humidity can be set, but you need to do it in the app. I see no reason the buttons on the device couldn't be multi-purpose. E.g. long-hold the auto button and enter a mode which allows you to adjust the target humidity with the other buttons. Same for the display, long-hold on/off or sleep to turn the display off. So how do you use this at night? Download the app... set your target humidity level, put the device in auto, adjust the warmth setting to your preference, and then scroll to the bottom of the app and find the toggle to turn off the display. Doing all this will let your device run at night with the display off and will turn itself off/on to maintain the target humidity. I honestly want to rate this lower because I just don't believe this needs an app (I'm very concerned about data privacy), and I know exactly why this was made the way it was...but it just works well. It's so quite, maintains humidity well, and is easy to maintain.
A**R
Another great product by levoit
Love this humidifier. It will humidify a 200 square room in no time, I own a Vicks humidifier and there is no comparison between the two. The app works flawlessly and is so convenient to control the humidifier before going to sleep. The only complaint I could have is that the sensor reading is inaccurate but that is not a concern to me, I keep a hygrometer in the room for measurement, given that it blows out humid air, I don’t think there is a way to make that accurate unless maybe the sensor placement could be improved. I adjust the schedule to run for 20 minutes each hour at night and this keeps the room comfortable in the driest season. Overall, this is a great humidifier to have. Cleaning it is not as bad as others say, I clean it weekly by putting the parts in water and vinegar and this keeps it perfectly clean.
O**!
Much improved over our old humidifier! Nice automated features.
Neat, quiet, integrates well with Alexa. I use only distilled water in this unit, which means it seldom needs cleaning. It's almost silent in operation. It has an app (sigh...doesn't everything these days?) that makes it easy to set up a schedule to run the unit only during our sleep time. For times when the schedule isn't suitable, it's easy to control the unit by voice through Alexa. We have used only the cool mist function, not the warm mist setting.
J**.
Love the humidifier, plenty of details to share
The noise level on this humidifier is so incredibly low that I barely know it’s on. Actually, I don’t know that it is on unless I look for the mist. Other than working reliably, having a quiet humidifier is important to me because I am incredibly noise sensitive. Even in a very quiet room, I don’t notice that’s this humidifier is on. Other features that are important to me: it is very sturdy and and yet lightweight. Easy to carry from them to room, very portable, and there are no leaks when the tank is full. I particularly like the sleep mode so I can sleep through the night without any light at all. This humidifier was the ONLY thing that made me comfortable when I had a very bad cold, with symptoms as bad as the flu. This cold was a beast and I was down for a week. Nothing relieved the total stuffiness in my nose except for this humidifier. Not nose sprays, not over-the-counter medication,nothing. But all I had to do was fill the tank on the humidifier then turn it on and…relief. I won’t say I had instant relief but within hours I did. Also, the heat level is high enough to be effective and yet low enough that I could lean over the mist to loosen the mucus in my nose and relieve the stuffiness.
H**R
Quiet, Effective and worth every penny
I’ve been using the LEVOIT OasisMist 4.5L humidifier in my bedroom for several weeks, and it has exceeded my expectations in multiple ways. The combination of warm and cool mist, plus the ability to set custom humidity levels, has made it easy to keep my room comfortable throughout the day and night. For reference I suffer from Sjogren's syndrome and this humidifier has been my saving grace. What stands out most is how quiet this humidifier is — even on higher settings it barely makes a sound, which is great for light sleepers. The top-fill design is another huge advantage; refilling it takes only a few seconds, and cleaning is simple compared to other humidifiers I’ve owned. You can turn off the light which was another contributing factor as to why i purchased this humidifier. Performance-wise, the 4.5L tank easily lasts through the night, and the unit increases humidity noticeably fast, which helped reduce dry throat and sinus discomfort during colder months. Overall, this humidifier is well-designed, efficient, and user-friendly. If you’re looking for a dependable option for a bedroom or medium-to-large room, the OasisMist is the way to go.
A**.
Nog nöjd
Bra funktioner men låter för mycket efter ett par år. Det hjälper inte att rengöra
S**N
Top Gerät
Nicht zu groß, kein Geräusch, funktioniert super
S**O
10 de 10
Maravilloso. Todo funciona como debe. Muy Intuitivo y con la app es fantástico el control. 10/10
C**A
Impressive!
This humidifier is so quiet! It is in a large room, but it’s really just for me and it’s still keeping it at about 50% humidity. I have it set on the highest setting and the tank has lasted 24 hours. Super easy to fill, either by removing the tank and filling elsewhere or filling from the top. Very happy about this purchase!
D**4
Fait le job
Très content de mon achat. je mets la puissance maximum ainsi que la température de l'eau car j'ai un espace important à humidifier
Trustpilot
1 month ago
2 weeks ago