LEVOIT OasisMist 4.5L Warm and Cool Mist Humidifier: features and specs

The LEVOIT OasisMist 4.5L is a smart ultrasonic humidifier that can produce warm or cool mist. It has a 4.5-litre tank filled from the top, two adjustable nozzles and app control. It is aimed at bedrooms and living rooms where winter heating leaves the air dry. Here is what its features mean.

Warm and cool mist

Cool mist is the usual choice for warmer weather, while warm mist can feel more comfortable in winter. LEVOIT sets the warm mist temperature between 40°C and 60°C and says warming the water also reduces the white dust that mineral-rich water can leave on furniture. In general, using distilled or filtered water cuts that dust further.

Auto mode and humidity targets

In Auto Mode the humidifier keeps the room between 40 and 60 percent relative humidity (RH), a range often used as a comfortable indoor level. You can choose a target in the VeSync app, or turn on Auto Mode from the display. The app also shows real-time humidity.

Coverage and dual nozzles

LEVOIT recommends it for rooms of 215 to 430 square feet (about 20 to 40 m²). Two 360° rotating nozzles let you point the mist in different directions, and a double duct design is meant to spread moisture more evenly and quickly.

Top-fill tank

You pour water straight into the 4.5 L tank from above, without flipping it over. A wide opening and a handle make it simpler to reach inside for cleaning, which matters because humidifiers need regular upkeep.

Quiet operation

LEVOIT describes triple noise reduction technology, and its description gives a sound level as low as 26 dB, which the brand compares to whisper-quiet. The display lights can be turned off for sleeping. Real noise depends on the room and the mist setting.

Aroma tray

An aroma tray takes two or three drops of essential oil on an aroma pad. Only use oils in the tray, as the manual directs, not in the water tank.

Smart control

The free VeSync app handles remote control, schedules, timers and mist output.

What's in the box

LEVOIT lists the humidifier, a cleaning brush, three aroma pads, three absorption pads, two water filter sponges (one of each pre-installed), a user manual and a quick start guide. It measures 10.8 x 6.0 x 12.0 inches (about 27 x 15 x 30 cm) and weighs 5.3 lb (about 2.4 kg).

What to check before you buy

• Room size: compare the 215 to 430 sq ft coverage range with your room.
• Cleaning: clean and fully dry it after use, as LEVOIT advises, and follow the manual.
• Water: check the manual on suitable water and how often to change it.
• Spare parts: confirm you can get genuine replacement pads and sponges.
• Placement: put it on a level, water-resistant surface away from walls and electronics.
• Wi-Fi: the app needs a compatible phone and network.

The short version

• A 4.5 L ultrasonic humidifier with warm and cool mist.
• Auto Mode holds 40 to 60 percent RH.
• Top-fill tank and dual 360° nozzles.
• Aroma tray, app schedules and a quiet design (as low as 26 dB, per LEVOIT).
• About 5.3 lb; rated for rooms of 215 to 430 sq ft.

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