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LEVOIT · Review

LEVOIT OasisMist 450S Review

The OasisMist 450S is a smart ultrasonic humidifier that can produce warm or cool mist, with a built-in humidity sensor and app control that keeps rooms at a set humidity.

LEVOIT OasisMist 450S Smart Warm and Cool Mist Humidifier

LEVOIT

LEVOIT OasisMist 450S Smart Warm and Cool Mist Humidifier

Best for: bedrooms and large rooms in dry climates

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Our verdict

The LEVOIT OasisMist 450S is a capable smart humidifier with warm and cool mist and accurate auto mode. Mineral dust and regular cleaning are the usual ultrasonic trade-offs.

5L smart humidifier with warm and cool mist, auto humidity mode and app control.

By the numbers

Key specifications

From manufacturer documentation. Confirm current specs on the listing.

LEVOIT OasisMist 450S Smart Warm and Cool Mist Humidifier specifications
SpecificationDetail
TypeUltrasonic, warm and cool mist
Tank4.5 liters, top-fill
Room size (LEVOIT spec)Up to about 505 sq ft
Smart featuresVeSync app, Alexa and Google Assistant
SensorBuilt-in humidity sensor with auto mode
ExtrasAroma pad, sleep mode
The trade-offs

Strengths & limitations

Pros

  • Warm and cool mist
  • Auto mode targets 40 to 60% humidity
  • Large tank with long runtime
  • App and voice control

Cons

  • Built-in humidity sensor can read high near walls
  • Filters and pads add running cost
  • Warm mist uses more power
Fit check

Who should buy it?

A good fit if you…

  • Bedrooms and living rooms up to medium size
  • People who want warm mist in winter
  • Smart home users
  • Anyone wanting automatic humidity control

Look elsewhere if you…

  • Homes with very hard water unwilling to use distilled
  • Large open-plan spaces
  • Buyers who want a filter-based evaporative unit

Warm Mist Option

Warm mist heats water before misting, which can feel more comfortable in cold weather and adds a small amount of heat to the room. It uses more power and the heating element needs descaling, so many owners switch between modes seasonally.

Auto Mode and App

The humidity sensor lets the 450S hold a target humidity, such as 40 to 50%, which is the range often recommended for comfort. Overhumidifying can cause condensation and mold, so auto mode is genuinely useful.

The VeSync app adds schedules and remote control. Voice assistant support works for basic commands.

White Dust and Cleaning

Like all ultrasonic humidifiers, the 450S can disperse minerals from hard tap water as white dust. Distilled or demineralized water prevents this.

Clean the tank weekly and descale regularly, as the EPA recommends for all humidifiers, to prevent bacteria and mold. The top-fill tank makes filling and wiping easier than bottom-fill designs.

LEVOIT OasisMist 450S Smart Warm and Cool Mist Humidifier

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Answers

Frequently asked questions

Does the LEVOIT 450S produce white dust?

It can with hard tap water, like all ultrasonic humidifiers. Distilled water prevents it.

How big a room does the 450S cover?

LEVOIT lists up to about 505 square feet.

Is warm mist better than cool mist?

Warm mist can feel more comfortable in winter but uses more energy. Cool mist is generally considered safer around children due to no heated water.

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