Ultrasonic Diffusers – Choosing the Best Oil Diffuser for Large Room


Ultrasonic DiffusersIf you’re looking for the perfect essential oil diffuser for large room, an ultrasonic one is your best option.

When you’re trying to fill a large room with soothing scents, you need a large aromatherapy diffuser to get the job done right, and we have compiled a list of some of the best essential oil diffuser on the market.

An ultrasonic diffuser works by emitting an electronic frequency, which creates vibrations that course through the water and rise to the surface of the diffuser where the essential oils float. They then vaporize the oils, dispersing them into the air. There are so many benefits to choosing an ultrasonic diffuser over all the other types out there.

Ultrasonic diffusers do not require any heat, so you never face the risk of fire as you would if you used an old-fashioned candle diffuser. This aspect also makes them great for children’s rooms because curious kids won’t get burned if they accidently touch the diffuser or knock it over.

This fact combined with the myriad designs that use colored LED lights make these diffusers the best option for children’s rooms, family rooms and offices.

Heat also destroys certain therapeutic properties in the essential oils that you use. Without the need to use heat to diffuse oils, ultrasonic diffusers are super effective at purifying the air in large rooms while they remove the unwanted odors and provide a level of aromatherapy that is simply unmatched. These are just a couple of the great benefits of choosing an ultrasonic diffuser for your large room. 

Here, we’re going help you choose the best aromatherapy diffuser for large rooms. We’re sure you’ll be able to find the perfect large room essential oil diffuser using our reviews below.

10 Ultrasonic Oil Diffusers for Large Rooms

Ultrasonic diffusers are the best to use in large rooms. This type of diffuser also double as a humidifier, so they’re ideal for dry climates as well.

1. Radha Beauty Aromatherapy Essential Oil Diffuser 7 Colors

This basic diffuser features seven different colored lights. It holds 120 ml of water for you to drop your essential oils into. To use it, simply unscrew the cover, add water to the fill line, drop in two drops of oil, screw the cover back on and it’s ready.

This diffuser is portable and has an adjustable mist mode, allowing you to control the humidity in the room as well. There’s also an auto shut off feature, which turns the diffuser off automatically when it runs out of water.


  • Portable
  • Auto shut-off
  • Adjustable mist mode


  • Light is bright
  • Loud alarm with automatic shut-off

2. Island’s Miracle Aromatherapy Essential Oil Diffuser 7 Color Changing LED Lights

This essential oil diffuser has a beautiful unique design with a leaf pattern cut out where seven different colored LED lights shine through. It holds 170 ml of water for you to add your essential oil to. To use it, just remove the top, add water to the fill line, drop in a few drops of any essential oil, replace the top and press the button to turn it on.

This diffuser doubles as a humidifier and has an auto shut-off feature. There is also a great night mode feature, which allows you to run the diffuser with zero lighting. This one is ideal for rooms from 500 sq. ft. to 800 sq. ft.


  • Unique leaf pattern design
  • Night mode operates with zero light
  • Auto shut-off feature


  • Operates with plug only – no batteries
  • Can’t set the auto shut-off feature for shorter intervals

3. H2EO Ultrasonic Diffuser Multi-Colored Lights Model

This ultrasonic diffuser comes with an array of exciting features. You can choose from four different colored lights for display, which can all be turned off at night for complete operation in the dark.

This model holds a generous 235 ml. You can fill it without unscrewing anything, but by simply pouring water directly into the bowl and adding 5-10 drops of your favorite essential oil. The unit can be set on one of three power settings, and can be programmed to turn off intermittently.


  • Works effectively in very large spaces, from 1500 to 2200 cubic feet
  • Option to turn all lights off for dark operation
  • Can be set to automatically shut off intermittently


  • Maintenance is semi-high, but worth it for all the extra features
  • Inside of lid must be cleaned often when oil drops from mist stick to it

4. MUJI Aroma Diffuser 11SS Ultrasonic Waves with Light

This diffuser is designed to work as a lamp, an oil diffuser and a cool mist humidifier all in one. It’s easy to use, all you need to do is open it, fill water to the fill line, add about 6 drops of essential oil, close the lid and press the mist button to start it.

One of the best features of this diffuser is that you can set an automatic timer in intervals from 30 minutes up to 3 hours. It works well in larger rooms and office spaces and has two light settings.


  • Serves three purposes in one – diffuser, lamp and humidifier
  • Timer can be set at intervals of 30 minutes to 3 hours
  • Easy to use


  • Doesn’t come with detailed instructions in English

5. Now Foods Ultrasonic Wood Grain Oil Diffuser

This diffuser has a unique flower-shaped design that will look great in any room. It’s BPA-free and requires no heat to run. This diffuser holds 500 ml of water for you to put essential oil into, which allows it to run for up to 8 hours. It works effectively in spaces up to 400 sq. ft. and automatically shuts off when it runs out of water.


  • Beautiful decorative design
  • Runs for a long time
  • Automatic shut-off when water runs out


  • A bit difficult to fill and clean properly

6. SpaRoom Spa-Mist Ultrasonic Mystic and Fragrance Diffuser

This spa-like diffuser holds 175 ml and can run for up to 4 hours. It’s ideal for spaces that aren’t too large and can work effectively from 150-200 sq. ft.

You can set it on three different light modes, with solid, rotating multi-colored lights, and off. It’s a simple ultrasonic diffuser with all the basic settings at the touch of a button.


  • Runs for a long time on little water and oil
  • Easy to use
  • Fun light settings with an option to run it with no light


  • Fill line isn’t very clear

7. URPOWER 500ml Aromatherapy Essential Oil Diffuser Ultrasonic Air Humidifier

This oil diffuser plus air humidifier is loaded with features and settings. It holds an impressive 500 ml of water, which allows it to run for up to 10 hours continuously. It also gives you the option of using 4 different timer settings and it has an auto shut-off feature in case it runs out of water. Choose from 7 different warm-colored LED lights, or turn them all of for operation in the dark.


  • 5 in 1 features – it functions as an aromatherapy diffuser, humidifier, night light, ionizer, and air purifier.
  • Warm light settings provide a comforting glow
  • Many settings for timers and lights
  • Works for a long time – 10 hours continuous


  • Needs to be cleaned once a week

8. GreenAir SpaVapor+ Instant Wellness 150ml Essential Oil Diffuser for Aromatherapy

This is a specially designed diffuser for aromatherapy that is built with ceramic discs. While most diffusers use metal, this advanced design ensures the prevention of oil corrosion. It’s BPA-free and is built with patented ultrasonic technology, which creates an ultrafine mist that extends the life of the essential oils you use.

Added features include 6 rotating colored LED lights and an auto shut-off feature that turns the diffuser off when it runs out of water.


  • Built with advanced patented technology to extend the life of the oils and the diffuser
  • Easy to use
  • Multiple light features and auto shut-off


  • Ideally used for smaller rooms of up to 250 sq. ft.

9. QUOOZ Lull Ultrasonic Aromatherapy Essential Oil Diffuser

This diffuser has a beautiful flower-shaped design with soothing LED lights. It holds 200 ml of water for your essential oils, which lasts 8-10 hours.

You can set the lights to your desired brightness or use the unique ‘breathing’ mode in which the light brightens and dims slowly. This feature is a great aid in meditation and breathing exercises.


  • Beautiful decorative design
  • LED lights are not too bright and can be set dim
  • High capacity allows the diffuser to run for long periods of time


  • You need to be careful when removing the lid because condensation builds up inside and can drip out once its removed

10. InnoGear Aromatherapy Essential Oil Diffuser Portable Ultrasonic Diffusers

The last diffuser on our list works in three ways – as humidifiers, aromatherapy diffusers and lamps or night lights. This diffuser is built with three working modes. One emits an intermittent mist every 30 seconds, another allows the diffuser to run continuously and the third turns off the diffuser and acts as a nightlight or lamp.


  • Portable so you can easily use it at home, in the office or for meditation
  • 7 LED mood lights and auto-shut off features makes it perfect for kids room
  • Humidifies dry air effectively


  • Works best in small rooms
  • Difficult to open with slide and twist design


Aromatherapy has many benefits and can be practiced through various ways. Aromatherapy is based on the principle of using scents to soothe, energize or heal your body and mind. It has been found that there are a range of scents derived from natural oils that have different effects on the mind and body.

The practice of aromatherapy has become very popular. People use essential oils in baths, use them to make candles, and even apply them to pressure points on the body. Some of the most powerful soothing scents include lavender, jasmine, bergamot and lemon. Energizing scents include thyme, grapefruit, peppermint and lemongrass. Healing scents include eucalyptus, frankincense, clove and oregano.

There are a few different types of diffusers that each work in different ways. It’s important to choose one that suits the size of your room. Otherwise, if your room is large and you choose the wrong type, you’ll end up not being able to smell the scent of the oil at all.

One of the best and most convenient ways to indulge in aromatherapy at home when you have large rooms is with an ultrasonic essential oil diffuser. An ultrasonic essential oil diffuser is the best oil diffuser for large room. It releases the scent into the air over a prolonged period of time, doubles as a humidifier to soothe you in dry climates, and triples as a night light. Placing these in your rooms at home provides you with a relaxing, refreshing atmosphere.

We hope that you have found our list helpful and that you find the perfect ultrasonic diffuser to help soothe your mind, energize your soul and heal your body while purifying the air around you.


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