Levoit OasisMist 450S LUH-O451S-WCA Smart Warm and Cool Mist Humidifier

With a 4.5 L tank and coverage listed for rooms up to 430 ft², the Levoit OasisMist 450S is designed to add moisture to bedrooms and other living spaces. Choose warm or cool mist, then use the app or Auto Mode to manage your preferred humidity. Its top-fill design makes adding water straightforward, while the wide opening gives you access for cleaning.

For simple, hands-on humidification, the display offers Auto Mode, for a routine you want to manage remotely, the app adds controls and scheduling. The dual 360° rotating nozzles let you direct the mist where it’s useful.

Key specifications

• Type: Ultrasonic warm and cool mist humidifier
• Capacity: 4.5 L
• Coverage: 215–430 ft²
• Runtime: Up to 45 hours
• Controls: App and display, Auto Mode maintains humidity between 40% and 60% RH
• Dimensions: 27.4D x 15.2W x 30.4H centimetres
• Operation: As low as 26 dB
• Warm mist temperature: 40°C to 60°C

Everyday use

The choice of warm or cool mist lets you adapt operation to your room and routine. Auto Mode is intended to maintain humidity in its stated range, while app control lets you adjust settings remotely and create schedules. That’s useful when you prefer to set a routine in advance, the display also provides a direct way to activate Auto Mode.

The top-fill tank is built for convenient refilling, and its wide opening helps with cleaning. Two rotating nozzles make it easier to orient the mist without repositioning the whole humidifier. For a light fragrance, add 2–3 drops of essential oil to the aroma tray—not to the water tank. The manufacturer also lists plant care among the smart features, making this a practical choice for a room shared by people and houseplants.

Buyers often highlight the quiet operation, straightforward setup, ease of filling and cleaning, and the mist output. Feedback on temperature controls and scheduled on/off behaviour is mixed, so the app’s remote controls and Auto Mode are best understood as ways to manage the humidifier rather than a substitute for checking the settings that suit your routine.

Included in the pack

The package contains one 4.5 L smart warm and cool mist humidifier, a quick start guide, an aroma pad, a cleaning brush, a user manual, and a water filter sponge. The aroma pad supports fragrance use through the tray, while the brush and wide tank opening help with routine cleaning.

Final verdict

The OasisMist 450S brings a large-capacity tank, two mist options, app control, and Auto Mode together in one bedroom-focused humidifier. It’s a good fit if you want to manage room humidity with either a direct display control or a scheduled app routine, and value easy top filling alongside flexible mist direction. Its 4.5 L capacity and listed coverage up to 430 ft² make it suited to everyday use in a bedroom or other room within that range.