How to Choose a Diffuser for a Large Room

Last update April 15, 2021
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Whether you want to add a soothing element to your office or home or you’re a fan of aromatherapy and searching for an air freshener, buying an essential oil diffuser can be the answer.

That said, a lot of people ask themselves questions “How to choose a diffuser” and “Which diffuser will be right for their space”, wondering if the one they pick will be able to handle the area and provide the full benefits that these devices can offer. Is it what you’re asking yourself too? Hopefully, after reading this article, you’ll get all the answers and picking the best essential oil diffuser won’t be a problem for you. 

Tips on Choosing an Oil Diffuser

Larger Capacity Doesn’t Mean More Power

Larger capacity doesn't mean more power

First things first bear in mind that a large diffuser doesn’t mean a powerful diffuser. What “large” usually means is the capacity of a water tank that a diffuser accommodates. Does a larger capacity allow it to cover bigger space? No, not at all. Unlike what some people mistakenly believe, larger size options only mean that an oil diffuser can run for a longer time before a refill is required, not that it will be able to handle larger open spaces. 

Two Is Better Than One

Two oil diffusers in a room

Next, it’s essential to understand that there is a certain limit to how far the mist can be spread around the room. So, if you have a living area that is bigger than 1,000 sq.ft., expecting one unit to provide a strong mist to cover the whole space would be just too optimistic. In cases like this, it would be much more reasonable to get not one but two diffusers and get two of the same things that feature the same strength, the same power, and the same water tank capacity. By doing this way, you’ll achieve bigger coverage and get confidence that the mist will reach the farthest corners of a room. 

Use High-Quality Oil

Essential oils

Naturally, in order to have a strong scent, it is important to use premium essential oils. Anything that is too cheap is usually diluted down with other ingredients that not only weaken the oil strength but can actually cause headaches and other unpleasant health conditions. 

Aside from this, it is important to use enough oil. If you add just a small amount of oil drops to your diffuser, the mist will be weak and you won’t feel it in a spacious room. The recommended ratio to go by for a room of average size is between 3-6 drops of oil per 100 ml; for a larger work or home space, this amount can be safely doubled. 

To give you an idea of how to estimate the needed amount of oil droplets, a 300m diffuser with a 150ml water tank capacity will need around 9-10 drops of oil. This means a 500ml essential oil diffuser will need at least 15-20 drops, and if you go over this amount you’ll get even a stronger effect. 

Decide on the Type of an Essential Oil Diffuser

Types of oil diffusers

Finally, do not forget that there are four major types of oil diffusers to choose from: 

  • Nebulizing;
  • Heat;
  • Evaporative;
  • Ultrasonic.

The distinguishing feature of nebulizing diffusers is that they diffuse only the essential oil and use no heat or water. For the same reason, however, they are also the most expensive option.

When it comes to heat diffusers, as you can guess from the name, they use heat elements to break down the oil and cause it to evaporate. Dissimilar to nebulizing diffusers, they use oil mixed with water, which makes them more economical.

As far as evaporative models go, those are featured with a fan that uses the moving air to circulate the particles of the essential oil and cause it to evaporate. The benefit of this diffuser is that it provides phased diffusion, releasing the lighter components first and heavier components last. The downside: they produce more noise than other types. 

Ultrasonic diffusers, in turn, are perhaps the most popular. They work with the help of electronic frequencies and water, and can act as both a diffuser and a humidifier. Thanks to this, they perfectly suit those people who live in a drier climate and need a multi-functional device to alleviate the respiratory ailments during allergy/cold seasons. Besides that, they produce almost no noise, use very little oil, and more often than not, can cover larger spaces. 

Below, we offer you to check one of the best essential oil diffusers that use ultrasonic technology. To learn more about the full benefits of using essential oils, make sure to read this post. 

ASAKUKI Essential Oil Diffuser

ASAKUKI Essential Oil Diffuser

To kick things off, the ASAKUKI manufacturer is known for producing high-quality household items meant to improve our life. In fact, the company’s name itself comes from the Japanese pronunciation and means the “air in the morning”, which directly indicates that all of their products including this essential oil diffuser are designed with focus on health and well-being.

When it comes to the advantages of the ASAKIKI Essential Oil Diffuser, it’s packed full of them. First off, it’s an ultrasonic device. This means it atomizes the water and oil without using any chemical components or heat and produces a cool mist, which allows it to act as a vaporizer to prevent dry air and help improve your home’s atmosphere quality by eliminating unpleasant smells of smoking and pets.

Second, the device is highly efficient. With a 400ml water tank, it will provide you with up to 12 hours of continuous run time, diffusing the essential oil over 200+ sq.ft., making it perfectly suited for small offices, large bedrooms or nurseries, yoga classes or any other place where aromatherapy may be needed.

In addition, it features multiple misting modes. Using a remote control that comes included, you can choose the preferred mode as well as select the desired amount of time that you want to have it on, which is a great plus in our book. Also an advantage is that it produces little to no noise, so even if you decide to leave it on throughout the night, its operation won’t disturb you.

Advantages of ASAKIKI essential oil diffuser

The design is one other area where the ASAKIKI Essential Oil Diffuser shines. With a streamlined vase-shaped body in a wood-grain case, it looks stylish and aesthetically pleasing, making it a nice extension to any room interior. To add to that, it features multiple light color options. That is to say, you get a choice of 14 different LED colors including 7 low intensity and 7 medium/high intensity, so you can pick your favorite color or change it every night to create a different mood. Surely, if you only want the mist working, the light function can be turned off completely, too. A combination of all of these features along with its stylish design makes it one of the most attractive choices you can find on the market so far.


  • It uses only 5-10 drops of the essential oil, yet it puts out a strong scent and fills the room with pleasant aromas very quickly.
  • You get a choice of several mist settings, so you can enjoy not only the full benefits of aromatherapy but also use it as a humidifier to prevent dry air.
  • The timer function allows you to run it for the exact amount of time you want.
  • The auto shut-off prevents overheating when the water runs out.
  • It covers quite large spaces with a size of 200+ sq.ft.
  • It offers multiple light colors to create the mood and help relieve you from stress.
  • The volume of its working is less than 30 dB, which makes it virtually whisper-quiet.
  • With its stylish design, it makes for a fantastic Christmas, Valentine’s Day, Anniversary, or Birthday gift.


  • Efficient for small to medium-sized rooms. For bigger coverage, it’s recommended to get two of these things.

In Conclusion

Now that you know that larger doesn’t necessarily mean power and that the quality of the oil directly affects the intensity of the scent, it’s easy to see why the ASAKIKI is a great choice. Packed full of useful features, it puts out a strong strength and can effectively cover quite a large room. Besides, it’s a multifunctional unit, meaning that in addition to aromatherapy sessions it will provide you with the benefits of a humidifier, thus, making itself a beneficial purchase for users who have some sort of respiratory ailments or suffer from allergies. Admittedly, you might need to get two of these things to diffuse the oil in a larger room, but if your space isn’t massive, the ASAKIKI Essential Oil Diffuser will certainly fit the bill. As a nice bonus, right now you can get 10% off with code RFNEHRTG.