10 Best Oil Diffusers 2025 in the United States

The LEVOIT Smart Cool Mist Top Fill Humidifier is designed mainly as a bedroom humidifier with the added benefit of essential oil diffusion. It uses ultrasonic technology to quietly add moisture to the air, covering rooms up to about 290 square feet, which fits well for bedrooms or small living spaces. Its 3-liter water tank allows for long operation without frequent refills, and the top-fill design makes filling and cleaning simple and mess-free—no need to flip the tank.

One of the standout features is its smart functionality: you can control it remotely using the Vesync app or voice commands, set timers, and customize humidity levels. It also has an auto mode that maintains the desired humidity using a built-in sensor, which means less manual adjustment. This is especially helpful for people who want a consistent comfortable environment without fuss. Adding a few drops of essential oils turns it into an oil diffuser, adding a pleasant aroma, though it's not primarily marketed as a dedicated diffuser with complex scent settings.

The humidifier runs quietly, making it suitable for bedrooms and nurseries where low noise is important. It doesn’t mention lighting features, so it might lack ambient or mood lights that some diffusers offer. The device’s shape and white finish make it a neutral fit for most rooms, and the materials are easy to clean, which is essential for maintaining performance and hygiene. While it supports essential oils, it’s primarily a humidifier, so users seeking a powerful or highly customizable aroma diffuser might find it less specialized. Since it’s a smart device, relying on app control could be tricky for those less comfortable with technology. It represents a reliable choice for anyone wanting a quiet, easy-to-use humidifier with the added perk of light scent diffusion and modern smart controls.

The Levoit Smart Humidifier is a large-room ultrasonic diffuser designed to cover up to 505 square feet, making it a suitable choice for bedrooms, nurseries, or medium to large living areas. Its sizable 6-liter water tank supports up to 60 hours of continuous use, which reduces the frequency of refills. The top-fill design facilitates easier refilling and cleaning, helping to avoid leaks and hard-to-reach spots.

This humidifier operates very quietly (30dB or less), ensuring it won’t disturb sleep or daily activities. It features multiple modes tailored to different times of day, such as Auto Mode for consistent humidity, Sleep Mode for quiet nighttime use, and Plant Mode to help keep houseplants healthy. Additionally, it supports adding essential oils through aroma pads for aromatherapy benefits. A standout feature is the smart app and voice control, allowing you to monitor and adjust settings remotely, which adds convenience for customizing schedules or checking humidity without being near the unit.

Constructed from durable materials with a modern gray square design, the device fits well in various home styles. It requires occasional filter and aroma pad replacements, and using distilled water is recommended for optimal performance and health. Although it lacks advanced lighting features like color-changing LEDs, it effectively focuses on humidification and scent diffusion. For those seeking a quiet, smart-controlled diffuser that also functions as a humidifier for large spaces, this Levoit model delivers strong performance along with user-friendly features, with some routine maintenance needed.

The LEVOIT 6L Smart Warm and Cool Mist Humidifier is a solid choice for those wanting a large-capacity device that works well in bedrooms or living rooms up to about 430 square feet. Its 6-liter water tank allows for up to 60 hours of continuous use, which means fewer refills and more convenience. It offers both warm and cool mist options, helping reduce white dust and providing a safer warm mist temperature, which is beneficial for people with sinus issues or those who want more soothing air moisture. The ultrasonic operation keeps noise levels low, making it suitable for quiet environments like bedrooms.

You can control it remotely via an app or use the built-in display to set schedules and maintain ideal humidity levels automatically, which adds to its ease of use. The diffuser also supports essential oils, enhancing the room aroma. Design-wise, it’s rectangular and solidly built, with included accessories like aroma pads and a cleaning brush, which help keep maintenance simple.

On the downside, while it offers smart features and a quiet operation, the size might be a bit bulky for very small spaces or for users wanting a compact diffuser. It requires hand washing for cleaning, which might be less convenient for some. Lighting features are not highlighted, so if mood lighting is important to you, this might not be the best pick. This humidifier is best suited for those who need large coverage, long runtime, and smart control, with the added benefit of essential oil diffusion.