4 Of The Best Essential Oil Diffusers For Large Rooms & Spaces – Great Scents, Great Value!

I’d love to help you enjoy the benefits of aromatherapy. I’ve put together a list of 4 of the best aromatherapy essential oil diffusers that work well for large rooms.

There’s also lots of helpful info to know before shopping, too.

What are essential oils?

Diagram showing examples of essential oils used in diffusers

Essential oil diffusers are small machines powered by electricity that offer aromatherapy benefits. That means they release scented oils called “essential oils” into a room. They’re great for many purposes including relaxation, better sleep, focus, and providing a healthy way to relieve stress.

Essential oils are concentrated liquids taken (normally) from plants. They’re extracted from a variety of plants such as eucalyptus, orange, lime, cinnamon, myrrh, and many more.

The liquid is extracted by a process called distillation that makes a product that’s able to easily evaporate at normal temperatures (also called hydrophobic).

Why are they called “essential” oils?

They’re called “essential” because they keep the natural essence (in other words, the natural properties and scent) of the plant they’re derived from. Unlike other oils you may have used before, they usually can evaporate without leaving a residue or oil behind.

Typically you’ll buy essential oils for aromatherapy in very small vials made of glass or plastic. They’re very efficient at making scents in a room – normally only a few drops are needed each time!

What does an essential oil diffuser do?

Illustrated diagram of how essential oil aromatherapy diffuser works

Diagram showing an essential oil diffuser and how it works. Diffusers are a version of cool mist humidifiers that convert stored water into a vapor that rises into the air. A few drops of essential oil are added to the water and it’s evaporated as part of the process. The result is wonderful scents that fill a room’s air.

Essential oil diffusers work by using electricity to power an electrical water vaporizer (also called a nebulizer) that turns water into a fine mist.

The mist rises into the air and carries evaporated essential oil with it.

Diffusers are a different type of cool mist humidifier as they work using the same principle: they turn water into a super-fine mist that rises into the air and fills a room. They’re different, however, in their features, style, mist production, and water capacity.

In fact, they’re so similar that some cool mist humidifiers include an essential oil tray as an option.

Image of cool mist humidifier essential oil tray example

Shown: As they work the same as diffusers, some cool mist humidifiers include an essential oil tray feature. Shown is the popular Everlasting Comfort large room humidifier which includes this neat option.

Cool mist humidifiers vs essential oil diffusers

There are a few differences between the two, however. Here are a few to know:

  • Diffusers are available with a smaller water capacity and are ideal for smaller rooms. Humidifiers often come with a much later water tank.
  • Essential oil diffusers are more likely to be offered with decorative features like LED night lights or accent lighting. Some also have a more stylish outward appearance (whereas humidifiers are a bit more practical in design)
  • Cool mist humidifiers often offer an adjustable mist output. Many standard essential oil diffusers do not, or offer 1 to 3 fixed output level options.

How to use essential oils with a diffuser

Image showing how to add drops of essential oil to a diffuser

Essential oils are added to a diffuser by carefully placing a few drops (usually 2-3 or so) into the water reservoir. The cap is then placed over it before turning it on.

Water is poured into the diffuser’s cup or tank then a few drops (about 2-3 drops typically) of aromatherapy (essential) oil are added. As most are concentrated, you won’t need much. They’re very efficient at adding a noticeable scent throughout a room.

After the water cover is placed over the top, the unit is turned on and the diffuser begins working immediately.

Water is pulled through the nebulizer and rises inside the cover, escaping silently through a small vent. At the same time, the water supply is bubbled a bit to help mix the oil with the water evenly.

As it runs the result is a very fine mist that resembles the look of smoke but is in fact just harmless, cool water with a pleasant scent added.

Is a diffuser good for you?

Image of an essential oil diffuser on table near bedroom

Diffusers offer a safe, healthy alternative to other ways of adding aromas to a room. There aren’t any health risks involved in using them.

Unlike incense or oil warmers, there’s no danger of a fire hazard, hot ashes, or inhaling smoke. Additionally, while candles are generally safe they can be knocked over by accident, causing a possible burn or fire hazard with the hot wax or flame.

The health benefits of using a diffuser

While essential oils can be used on your skin for a range of reasons, there’s a risk of having an allergic reaction. That’s not the case with essential oil use.

It’s thought that inhaling the aromas from the oils stimulates certain areas of the brain that play a role in memories, behaviors, emotions, sense of smell, and thoughts. However, there’s no real scientific proof of any true healing abilities.

For the most part, natural (essential) oils offer some aromatic therapy benefits that candles, incense, wax warmers, and reed oil diffusers do but with much easier maintenance, lower cost per use, and more safety.

Essential oil health benefits and other uses

Quality oils can help with a number of everyday life and health problems:

  • Stress, anxiety, and depression
  • Headaches and migraines
  • Sleep and insomnia issues
  • Reducing inflammation
  • Sickness & germ fighting: Antibiotic and antimicrobial
  • Happier, fresher home or office environment
  • Mosquito repellant

Additionally, high-quality and properly prepared oils don’t use synthetic chemicals or other substances that are potentially a health hazard over time. That’s in contrast to others like incense sticks which burn other substances that you’ll inhale unknowingly.

Personally, I’ve suffered from headaches triggered by someone using incense and I was exposed to too much of the smoke over time. Unlike those, I can easily control how much (or how little) aroma I have in the air when using a diffuser.

How diffusers are good for skin

Image of dry hand skin cracking due to dry air

Severely dry air leads to a lot of uncomfortable symptoms including skin problems. Dry, painful cracking can occur and even lead to bleeding! The great news is that diffusers act like small humidifiers and can give some nice benefits you might not know about.

As I mentioned earlier, diffusers are a smaller type of cool mist humidifier. Because they release extra moisture into the air, humidifiers and diffusers provide a number of bonus benefits.

  • The added moisture helps with dry skin symptoms
  • Reduces allergens in the air, causing fewer skin irritants to be around
  • Help reduce scratching the skin for you, your pets, and children

Additionally, they help with dry noise conditions and nosebleeds as well as dry eyes. After running in a room for a long time the humidity increases to a more comfortable level.

They’re beneficial in both warm climates and during winter when the air is severely dry.

What makes a good oil diffuser for large rooms?

Image showing tips for what makes a good diffuser for large rooms

Buying a diffuser for a larger room (as opposed to a smaller room like a bedroom or office) isn’t going to be difficult if you know what to look for. There are a few things you’ll want to know first, however, before shopping.

My main suggestion for getting the right diffuser for a large room is one with a larger water capacity. This is because they’re able to run longer and since a medium or large room has more air volume it takes more time for the aroma to cover it completely.

Note: Diffusers are often made overseas where the metric system is used. Because of this, water capacity is often listed in milliliters (mL). 

They’re also often listed in 100s of mL (100mL, 500mL, and so on).


URPOWER small room essential oil diffuser example image

Example of a small room diffuser with a capacity of about 100mL. While it’s good for your bedroom, office, and other areas, the capacity is a bit small for larger rooms.

For example, my most recent purchase is the popular URPower color-changing diffuser for small rooms. At 100mL capacity, it’s fine for my bedroom but not for large rooms like a living room.

In that case, you’d want one with a water holder or tank several times that size. 500mL or larger is a good choice.

Features to look for

Larger capacity isn’t the only thing you should shop for. A good diffuser will also have nice features to make using it easier as well as for accenting your home, too.

Here are a few examples:

  • Adjustable mist level output (not required but very helpful)
  • Accent lighting features
  • Timer options for setting the run time
  • Easy to use
  • Easy to refill the water supply
  • Remote control option
  • Great buyer reviews, in general

Generally speaking, nearly all oil diffusers are very quiet if they’re well-designed. In fact, they’re so quiet they’re nearly impossible to hear in my experience.

Additionally, you’ll want to shop for one with many happy buyer reviews as people don’t like hassle or problems. A well-selling, highly rated diffuser is pretty much a sure bet.

★ 4 of the best diffusers for large rooms ★

Our top picks at a glance

URPOWER 700mL Square
  • A super-popular favorite! Great value and nice features
  • Long run time on one tank (20hrs)
  • Auto-off timer, LED accent lighting, and 2 mist levels
Check On Amazon →See Customer Reviews →
Pure Enrichment PureSpa XL
  • Provides up to a whopping 50 hrs on one tank!
  • Works as humidifier or diffuser. Simple push button controls
  • Cool accent lighting feature. Great 5 year warranty
Check On Amazon →See Customer Reviews →
Exqline 1500mL Adjustable
  • Simple to maintain + long run time. Great for many large areas
  • Built-in water gauge. Adjustable dial mist level, rotating nozzle
  • Accent lighting includes dimmer
Check On Amazon →See Customer Reviews →
URPOWER 1000mL Round
  • Best-seller with remote control & 15-23 hour run time
  • 7 color lighting. Works as night light too
  • High/low mist output. Timer: 3, 6, 9 hr options
Check On Amazon →See Customer Reviews →

Reviews, details, and pros & cons

1. URPOWER 700mL Ultrasonic Color Changing – An affordable best-seller that’s feature-packed.

Best seller product review badge graphic image

URPOWER square 700mL essential oil diffuser product image

Thinking you’ll have to spend a lot to get a great diffuser? Think again!

The URPOWER square 700mL diffuser is not only a great value and a good choice for large rooms, but it’s one of the best-selling models you’ll find for under $40.

Check out the great features you’ll get:

  • Whisper-quiet operation
  • Auto shutoff upon empty water
  • Lovely selectable 7-color LED accent lighting (with dimmer)
  • 700mL water capacity for over 20 hours of use between refills
  • 2 mist modes: Low & high
  • Steady on and auto-off timer modes (1, 3, and 6 hours)
  • Modern, stylish design looks great anywhere
  • Easy maintenance – takes only seconds

URPOWER square 700mL diffuser maintenance how-to diagram

It’s not only a great value but easy to use, too. Definitely a good design in my opinion. Just remove the cover, fill it with water (water cup included), add a few drops of oil, and turn it on. Now sit back and enjoy lovely fragrant scents!

I could talk about the features for a long time, but despite the nice things it offers it’s still really easy to use. Maintenance is a snap, and I’m sure you’ll agree too when you get one of your own.

To get it ready for use, just a few steps are needed:

  • Remove the top cover
  • Fill water to the top (note: there’s a nice little water filler cup provided)
  • Add a few drops of oil
  • Turn it on

..and you’re done. Optionally you can set the accent lighting to one several modes and brightness levels while it’s working.

URPOWER square 700mL diffuser LED color options image

Pick from 7 lovely colors with either a steady-on or color changing mode. Need a comforting night light? Just adjust the brightness as that’s a built-in feature, too. It’s a really nice looking design I love and I’m sure you’ll enjoy it as well. Great for both adults and children.

The LED light accent feature is pretty cool. In fact, while it’s optional, you’re not stuck with only 1 mode or 1 color. Choose from 7 soft glowing colors and 2 modes: steady-on or color changing.

Feel like it’s a bit bright? Just use the light button to adjust the brightness or turn the light back off. It’s easy to do and becomes second nature in only minutes, in my experience.

Controls, run time, and mist adjustment features

URPOWER square 700mL diffuser controls diagram

With 700mL water capacity (about 24 oz) it’s a great choice you’ll get just over 20 hours of continuous run time on a single refill!

Not only that, but 2 mist output levels are available: Low and high. That’s a great option as sometimes you don’t feel like waiting – you want your favorite scent right away.

3 buttons are provided for easy-to-use controls:

  • Light mode & color button
  • Mist level button
  • On/timer auto-off select button

Select steady-on mode or push again to choose one of the 3 timer settings: 1, 3, or 6 hours of use before it conveniently shuts off automatically. Very nice!

What to know

I do have a few minor gripes, though: The owner’s manual could be a bit better, and there’s no essential oil included. You’ll need to remember to pick up one yourself to get started.

Overall, it’s a fantastic buy and I really recommend it. Makes a great gift, too!

  • Affordable and a good value
  • Good capacity/run time (700mL, > 20 hrs)
  • Lovely LED accent lighting
  • Selectable high/low mist output
  • Easy maintenance
  • Includes water filler cup with measurements
  • Simple 3 button control
  • Auto-off timer options
  • Modern styling looks great
  • Whisper-quiet operation
  • Water capacity is lower than some
  • Owner’s manual could be a bit better
  • No remote control option
  • No directional nozzle for mist
  • Some water can drip when removing the cover

Honestly? It’s tough to beat! Unless you need a model with even more water capacity or higher output for use as a humidifier, it’s a fantastic choice.

No wonder it’s a bestseller! Find out for yourself why it's one of the highest-rated diffusers you'll find at Amazon.

2. Pure Enrichment PureSpa XL – One of today’s best large room diffusers you’ll find. Style, features, and 2000mL capacity.

Product image of the Pure Enrichment PureSpa XL diffuserPure Enrichment is one of today’s top air quality product manufacturers, including great humidifiers that people love. It’s no surprise that the PureSpa XL is one of today’s best large room diffusers for the money.

With 2000mL (about 1/2 gal.) water capacity, it’s one of the longest-running models you’ll find. Even better, it’s still affordable at under $60 if you shop smart.

Have a look at some of the excellent features you’ll get for your money:

  • Large 2L (1/2 gal) easily removable water tank
  • Simple push button electronic controls
  • Ionizer feature produces clean air ions
  • Soft glow LED 7-color lighting
  • Lighting option works without the diffuser on
  • 5 year warranty
  • High/low mist output levels
  • Works as both a humidifier or diffuser
  • Amazing 50 hours run time! (Low mist setting)
  • Up to 350 sq. ft. aromatherapy coverage
  • Super-quiet operation

Without a doubt, it’s one of the best I’ve had the pleasure of trying.

Pure Enrichment PureSpa XL diffuser parts diagram
The PureSpa XL is really simple and easy to understand! The controls are straightforward and I really like it. A simple 2-level mist button turns on and controls the output level while a nice LED lighting button lets you change the color and lighting mode.

Controls are simple, well-designed, and really easy to use. Just push the mist control button to get started and choose one of 2 output mist levels (high or low). Push the light button to switch on a soft glow in one of 7 colors.

Wonderful lighting options

Image of the Pure Enrichment PureSpa XL LED lighting at night

You’ll get some lovely lighting that’s a great addition to any room – and it makes a great night light, too! What I really like about the PureSpa XL is that the light feature works separately from the diffuser function.

Switch on the LED feature and the PureSpa XL begins gracefully and slowly moving through 7 lovely colors. You can choose to stay with 1 of the available 7 colors, too.

Easy maintenance, too!

Maintenance is easy and it’s a breeze in my opinion. Just remove the water tank & turn it upside down. Fill with clean water from your faucet and then add your desired essential oils.

Place it back on the base and you’re done! You’ll be enjoying great humidifier and/or essential oil therapy in seconds.

Pure Enrichment PureSpa XL diffuser humidifier product image #2

What’s truly amazing is how you’ll enjoy an unheard of 50 hours of run time on the low mist setting and a huge 22 hours on high. The competition simply can’t match that, even for more expensive models.

And unlike humidifiers from the competition with an essential oil feature, there’s no tiny, annoying tray that doesn’t work as well as adding the oil directly into the tank. It’s a real diffuser, not a gimmick!

I do wish there were adjustable mist dial and timer functions, but it’s a great diffuser that works really well and looks great anywhere. Honestly, you’ll be hard-pressed to find a better diffuser if you want a super-long run time and ease of use.

  • Amazing 50 & 22 hours on water refill
  • Attractive design
  • Hold 2L (0.5 gal.) of water
  • Lighting feature work without diffuser running
  • 2 mist levels: low & high
  • Great 5 year warranty
  • 7 color LED soft accent lighting
  • Push button electronic controls
  • Great design & build quality
  • Super-quiet operation
  • Works as a humidifier also
  • Easy maintenance
  • Steady color option for lighting
  • No timer feature
  • No adjustable mist dial (only 2 settings)
  • Alternate color not available
  • Beeping controls might not be for everyone
  • Costs ~ 2x smaller units
  • Removing water tank may lead to some dripping

Reviews are fantastic, just like my opinion of it. Honestly, I’m impressed. For an aromatherapy diffuser that’s so affordable ($60 or less, if you’re lucky) it’s excellent.

It works great, looks great, and well…it made my room smell great!

Have a look for yourself. Find out why it's one of the best-selling large room diffusers of all time at Amazon.

3. Exqline 1500mL Large Room Diffuser – Excellent for large rooms. Adjustable mist and fantastic run time.

Product image of Exqline large room essential oil diffuser humidifier

When it comes to large room essential oil aromatherapy, the Exqline diffuser and humidifier is one of the best available today. With a huge 1500mL (nearly 1/2 gallon) of water capacity, you’ll get up to a whopping 22 hours working time.

That means hours of hands-off, hassle-free aroma. Not only that, but despite its big large room performance and features it’s still wonderfully easy to use.

Speaking of features, check out some of the excellent ones you’ll get for a great price:

  • 7 accent light options great for mood setting or a night light
  • 360 degree rotating mist output nozzle
  • Precise adjustable rotating mist level output knob
  • Whisper-quiet operation – so quiet it’s nearly silent!
  • Great 325 to 450 square feet coverage
  • Not only a diffuser but true humidifier performance as well
  • Incredibly easy to use & keep up – takes only seconds
  • Auto-shutoff when water runs out

In fact, despite being both a humidifier and diffuser, it’s a cut above other models. Instead of a tiny oil tray on the side like others offer, you can add water and your favorite essential oils right at the top.

Maintenance & ease of use

It’s a snap to refill and get going again – it’s one of the easiest I’ve seen yet.

Image of Exqline maintenance features

Maintenance is a snap! Just remove the top cover, fill it with water, and add a few drops of wonderful aromatic oil. Switch it on and enjoy the aromatic air!

Not only is it powerful and really long-lasting, but you won’t have to worry about annoying maintenance like with some competitor models.

Maintenance is a breeze! Just 4 simple steps:

  • Remove the top cover
  • Fill with water
  • Add your aromatherapy oil
  • Replace the cover & turn on. Adjust output as desired

That’s it! You’ll be enjoying that wonderful scent you love in seconds.

The convenient rotating nozzle lets you point the mist output in any direction you like. It’s a great feature I find smart and well-designed.

Want to check the remaining water level? No problem! You can easily see the water through a small window right on the front. No need to worry about what happens when the tank is empty as the diffuser shuts off automatically.

Cool accent lighting features

Exqline diffuser lighting features diagram

One thing that really sets it apart, in my opinion, is the great accent lighting feature. Pushing the LED light button lets you easily switch between one of 7 soft-glowing colors.

It’s a great way to add a pleasant touch to your room. Use the built-in dimmer and it makes a great night light, too!

Final thoughts

As great as it is, like any other product, Exqline large room humidifier isn’t perfect. I do wish there was an auto-off timer feature with selectable hours. Also, there’s no way to use a remote control with it, but that’s not something I really missed when using it.

  • One of the largest capacities around
  • Over 22 hours use on low mist setting
  • Up to 450 sq. ft. coverage
  • Whisper-quiet operation
  • Adjustable mist output with dial
  • Super-easy operation
  • Great LED lighting feature with dimmer
  • Auto-off when the tank is empty
  • Visible water level gauge
  • 360 degree rotating nozzle
  • Maintenance is fast and simple
  • Great as both humidifier AND diffuser
  • Decent but brief instructions
  • No timer features
  • No additional color options

If you like simplicity, long run time, and practicality that’s affordable, it’s an excellent choice. In fact the adjustable mist level is something I really love about it – few offer that!

It works fast, looks great, and is easy to refill and get working quickly.

Check it out! Find out now why it's one of the top rated large room diffusers at Amazon.

4. URPOWER 1000mL With Remote – An excellent large room diffuser for everyone!

URPOWER 100mL diffuser with remote product image

The URPOWER 1000mL has many of the same features their popular other models do. However, not only do you get a long run time on one tank (up to a generous 20 hours) a remote is included too!

What’s especially appealing to me about it is the price: it’s very affordable (under $35 if you shop smart). It’s also one of the most popular today.

It’s a very good value because of the great features you’ll get:

  • Remote control with buttons for all features (includes battery)
  • 1000mL (~ 1/4 gal.) water tank for long run time
  • High or low mist output settings
  • LED soft-glow accent lighting with solid-on or color changing options
  • Night light option when the diffuser isn’t in use
  • Auto-off upon water empty condition
  • Timer function: 3, 6, or 9 hour settings
  • Long run time: up to 15 hours in high mode/23 in low
  • Easy maintenance – refilling is quick and painless

Controls & use

Diagram of URPOWER round 1000mL diffuser controls and remoteControls are straightforward easy to use, both on the remote and front panel. Push each button to change the mist level, lighting mode, and steady-on or timer functions. Although I’m unsure why they’re using a rather generic remote that says “HDMI switch” on top.

The pushbutton controls are simple and work well. Just either the remote or front panel, just push the mist button to select one of the 2 provide output levels (high, low). Turn on the LED color changing or solid-on modes with the LED button.

What’s pretty cool about the URPOWER diffuser is the timer feature – I really like it! Using this button you’re able to choose from 3 auto-off timers: 3, 6, or 9 hours. Really handy for overnight use or when you want hands-off, worry-free operation!

Maintenance is easy!

Much like the other nice products from the company, it takes only seconds to refill the unit:

  • Remove the top cover
  • Fill with water (1000mL, ~1/4 gal.)
  • Add essential oil droplets

You’re ready to go!

URPOWER 1000mL diffuser LED colors image

The URPOWER diffuser provides several neat accent lighting options: Off, color-changing, or steady-on with your choice of 1 of 7 lovely colors. Additionally, unlike some competitors, you can use it as a night light as the lighting works the diffuser is off. Nice!

Want a nice mood light, accent lighting, or even a night light? You’re covered there, too.

Choose from one of the built-in LED accent lighting modes:

  • Off
  • Gradual (slow) color changing – 7 colors
  • Steady on (your choice of color)

What I like especially is that unlike others I’ve tested, you’re not stuck using the lighting only when the diffuser is running. Since the LED lighting works separately when you’re not running the diffuser it makes a great night light, too.

While I do have a few complaints (the odd printing on top of the remote, basic instructions are decent but not great, and the buttons could be labeled a bit better) it’s a great one and I’m sure you’ll say the same, too.

  • 1000mL (1/4 gal) capacity
  • 15-23 hour run time on one refill
  • Up to 430 sq. ft. coverage
  • Works as a small humidifier
  • High or low mist output
  • Remote control works well
  • 3, 6, and 8 hour timer feature
  • Super-quiet operation
  • LED color accent light (changing or steady)
  • Lighting works separately from the diffuser
  • Nice, stylish shape looks good
  • Easy to use controls
  • Auto-off water feature
  • Odd remote control label
  • Basic instructions could be better
  • Would prefer slightly different button labels
  • No wood grain accents like other URPOWER model
  • Doesn’t include essential oils

It’s a cool-looking, easy to use, and well-designed little unit that’s made even more convenient thanks to the remote.

It’s just a tiny bit more generic looking than some more expensive units, but I like it. For ease of use and great room-filling aromatherapy, it’s a great choice.

Head over now and find out why it's one of the most popular diffusers at Amazon.

Grant Williams

About the author

Grant is a professional engineer by trade and has experience with both maintenance and do-it-yourself home projects. He enjoys sharing his expertise & ideas with others to help them improve their comfort and quality of life. Read more »

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