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Levoit OasisMist 450S Smart Review

This model stood out thanks to the sleek design, high-end functionality, and sheer convenience of operation
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Levoit OasisMist 450S Smart Review (We measured the sound of each unit on their various settings.)
We measured the sound of each unit on their various settings.
Credit: Matt Lighthart
Price:  $90 List
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Manufacturer:   Levoit
By Sentry Kelly and Ryan White  ⋅  Jun 12, 2024
85
OVERALL
SCORE


RANKED
#2 of 12
  • Effectiveness - 40% 8.9
  • Ease of Cleaning - 25% 8.0
  • Convenience - 20% 9.8
  • Run Time - 10% 5.0
  • Operation Cost - 5% 9.1

Our Verdict

The Levoit Oasis Mist 450S Smart stands out as one of the best humidifiers on the market. We were particularly impressed by its straightforward design, integrated humidistat, and smart app compatibility. This pairing offers a range of useful features, including setting schedules and timers, cleaning reminders, humidity data history, and a comprehensive maintenance guide, enhancing its overall convenience and functionality. The top-fill design and wide opening make the tank super easy to fill back up and clean. The dual nozzle is somewhat of a novelty, but proved useful in distributing humidity in multiple directions. Overall, we were quite pleased with this model, and it sets the bar for top-performing humidifiers. To see how it stacks up against other machines, check out our comprehensive humidifier review.
REASONS TO BUY
Effective
Warm misting option
Smart functionality
Easy to carry
REASONS TO AVOID
Pricey

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Overall Score Sort Icon
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Bottom Line This device sits among the top performers due to its overall effectiveness and intuitive smart designThis is one of the highest performing humidifiers on the market, impressing us with its high output and effortless operationA great choice for a humidifier with comprehensive controls, a smartphone app, and no-fuss filling and cleaningAffordable, feature-rich, and effective, this humidifier is a great all around choiceIt doesn't have the most power, but this device gets the job done at an affordable price
Rating Categories Levoit OasisMist 45... Honeywell HUL430 Levoit Classic 300S... Dreo Smart HM311S Levoit Dual 150 Ult...
Effectiveness (40%)
8.9
9.5
9.2
7.0
5.8
Ease of Cleaning (25%)
8.0
8.0
7.0
7.0
7.0
Convenience (20%)
9.8
8.5
9.8
10.0
7.5
Run Time (10%)
5.0
7.2
7.9
6.9
9.5
Operation Cost (5%)
9.1
8.0
7.2
7.8
6.0
Specs Levoit OasisMist 45... Honeywell HUL430 Levoit Classic 300S... Dreo Smart HM311S Levoit Dual 150 Ult...
Capacity 1.2 gal 1.3 gal 1.6 gal 1.0 gal 0.8 gal
Coverage Area 430 sq. ft. Medium Room 505 sq. ft. 300 sq. ft. 290 sq. ft.
Built in Humidistat Yes No Yes Yes No
Measured Noise (Low) 4.0 dBa 1.5 dBa .6 dBa 1.0 dBa .5 dBa
Measured Noise (Medium) 4 dBa Mode 2: 1.7 dBa
Mode 3: 1.9 dBa
1 dBa 2 dBa 1 dBa
Measured Noise (High) 5 dBa 2 dBa 2 dBa 3 dBa 1 dBa
Nightlight No Yes Yes Yes No
Sleep Mode Yes No Yes Yes No
Available App Yes No Yes Yes No
Modes 1-3, Auto 1-4 1-3, Auto 1-3, Auto Dial
Relative Humidity Range 30-80 None 30-80 30-90 None
Warm Mist Yes No No No No
Auto Shutoff Yes Yes Yes Yes Yes
Filter Required Optional No Optional No Optional
Aromatherapy Capable Yes Yes Yes Yes Yes
Removable Tank Yes Yes Yes Yes Yes
Top Fill / Bottom Fill Top Bottom Top Top Top
Humidification Technology Ultrasonic Ultrasonic Ultrasonic Ultrasonic Ultrasonic
Manufacturer Dimensions 12.0" x 6.0" x 10.8" 13.2" x 8.8" x 8.8" 13.4" x 9.6" x 7.5" 10.2" x 11.0" x 5.5" 11.6" x 7.2" x 8.1"
Weight 5.3 lbs 6.6 lbs 4.3 lbs 3.0 lbs 3.0 lbs
Run Time (High) 9 hr 19 hr 22 hr 18 hr 29 hr
Relative Humidity Change 1 hr 68.8% 74.4% 71.8% 52.2% 41.8%

Our Analysis and Test Results

From effectiveness to operation cost, the Levoit Oasis Mist 450S Smart aced nearly every metric we have for humidifiers. Yes, humidifiers are simple devices that provide a specific function, but not all are created equal. The Levoit proves that it can hang with some of the best out there, and the test results speak for themselves.

Performance Comparison


We subject every humidifier to a comprehensive series of tests designed to find the best of the best.
Credit: Matt Lighthart

Effectiveness


Our main test is conducted to assess each humidifier's capability to alter the relative humidity in a room within a one-hour timeframe.


in our testing we discovered that the Levoit Oasis Mist 450S Smart can produce significant results, changing the relative humidity by 68.8% over the course of an hour. This impressive performance is attributed to its dual nozzle design, which disperses humidity in multiple directions. Although it falls slightly short of the highest-end models, the minor difference wouldn't be noticeable. With a proposed coverage of 430 sq. ft., the Levoit proves highly effective for most room sizes. In this specific test, we used a 150 sq. ft. room, which is the average bedroom size.

The Levoit Oasis Mist comes with a tiny drip tray for essential oils.
Credit: Matt Lighthart

Ease of Cleaning


To assess the ease of cleaning for each humidifier, we meticulously followed the instructions outlined in the manuals and conducted thorough cleaning procedures. Additionally, we identified whether each device featured a top or bottom fill design. Generally, machines with a top-fill design tend to be not only simpler to fill but also easier to clean.


Thankfully, the Levoit Oasis Mist 450S Smart features a top fill design, making it effortless to clean. Unlike some models we tested that had sharp corners or difficult-to-reach nooks, especially without a bottle brush, the Levoit had no obstructions, and the cleaning process was straightforward.

levoit oasismist 450s smart - the levoit oasis mist 450s smart is a breeze to keep clean.
The Levoit Oasis Mist 450S Smart is a breeze to keep clean.
Credit: Matt Lighthart

Convenience


In this assessment, our goal was to evaluate multiple factors. Initially, we checked if each device comes with a humidistat, which adjusts the humidifier's output based on the room's relative humidity. Furthermore, we investigated whether the machine includes any smart features, like a companion app or nighttime mode, and determined the ease of controlling it through the interface/buttons.


The Levoit Oasis Mist 450S Smart boasts an intuitive display complemented by responsive buttons and app control, granting access to a variety of features such as scheduling, voice control, cleaning reminders, timers, humidity data history, and a comprehensive maintenance guide. Additionally, it includes a “Plant Care” mode designed to assist in maintaining optimal humidity levels for various plant species in your home. Another added bonus is that you can add aromatherapy oils to this humidifier via a small tray.

levoit oasismist 450s smart - attractive and refined buttons make the levoit oasis mist 450s smart...
Attractive and refined buttons make the Levoit Oasis Mist 450S Smart fun and simple to use.
Credit: Matt Lighthart

A somewhat rare feature in the world of humidifiers, the Levoit provides a warm mist function, which makes this particular model great for cold winters. However, beware, because the warm mist function does draw considerably more power and will increase the overall cost of operation. More on that below.

levoit oasismist 450s smart - the handle is an added bonus for assisting in refilling the tank.
The handle is an added bonus for assisting in refilling the tank.
Credit: Matt Lighthart

Lastly, as noted earlier, this model features a top fill design complemented by a convenient carrying handle. This feature simplifies the process of transporting the humidifier to and from the sink for refills.

levoit oasismist 450s smart - refilling is super easy - just pop off the top.
Refilling is super easy - just pop off the top.
Credit: Matt Lighthart

Run Time


To assess runtime, we filled each humidifier with the minimum amount of water necessary for operation (200 mL for this model). After the humidifier stopped, we added an additional 50 mL of water directly into the base. Then, we recorded the duration until each device shut off on every setting available. For the Levoit Oasis Mist 450S Smart, which includes low, medium, and high settings, the runtimes were 17 minutes, 9 minutes, and 6 minutes, respectively.


Overall, run time is the general weakness of the Levoit, unfortunately. Due to its high output, it goes through water somewhat quickly. Thankfully, it boasts a 1.2-gallon tank (4542.49 milliliters), so you won't have to worry about filling it up too often. It automatically shuts off at 200 mL.


Considering all the strong points of the Levoit, this is hardly a dealbreaker. Especially given that the overall operation cost is quite low, which leads us right into our next metric.

levoit oasismist 450s smart - the warm mist mode on the levoit consumes significantly more energy...
The warm mist mode on the Levoit consumes significantly more energy compared to the core functionality.
Credit: Matt Lighthart

Operation Cost


Here's where the rubber meets the road. The last thing you want accompanying a new device in your home is additional cost. Obviously, humidifiers, along with other electronics in your domicile, consume energy, but cutting down on it as much as possible is ideal for your bank account and the environment. This is why we've included this metric.


Firstly, we employ the use of a Kilowatt meter and record the power consumption of each humidifier. Then, we calculate it all using the most up to date national average for cost/kwh.

levoit oasismist 450s smart - the 360 dual nozzle aids in the overall power of this machine.
The 360 dual nozzle aids in the overall power of this machine.
Credit: Matt Lighthart

Now, the Levoit Oasis Mist 450S Smart is very efficient, and on average it should only cost you a relatively meager $1.50 per month, unless you run the warm mist feature, which will bump up the operation cost of this device exponentially. Use this function with caution, because it will have a large impact on your energy bill, especially when used on the highest setting.

For complete clarity, we've included a handy chart so you can see the costs for yourself. As long as you use the warm mist function sparingly, it shouldn't be a problem. It's a bummer, though, because we loved the inclusion of this function.

levoit oasismist 450s smart - we analyze the overall efficiency of each humidifier.
We analyze the overall efficiency of each humidifier.
Credit: Matt Lighthart

Should You Buy the Levoit Oasis Mist 450S Smart?


Through extensive testing, we feel as though the Levoit Oasis Mist 450S Smart deserves consideration. It performed at a high level across the board with only a few minor hiccups, which were not deal breakers, in our opinion. This is easily one of the best humidifiers on the market and it proved its worth time and time again in nearly every metric. Overall, the Levoit Oasis Mist 450S Smart combines functionality, efficiency, and convenience, making it a worthwhile investment for improving air quality and maintaining optimal humidity levels in your home.

What Other Humidifiers Should You Consider?


There's a plethora of excellent humidifiers available across various price points. Among the most effective devices we've encountered include the Honeywell HUL430. While it comes with a premium price tag, it offers lots of pure humidifying power and performance. On the other hand, if you're seeking a budget-friendly option without compromising too much effectiveness, the Dreo HM311S is an excellent choice. It provides affordability and ease of use without sacrificing core functionality.

Sentry Kelly and Ryan White