The Two Basic Types
There are two main types of diffusers: Those that dispense undiluted essential oils into the air (atomizing also called nebulizing), and those that use water as part of the process (ultrasonic or wick based).
Ultrasonic (Water) Diffusers
These are less expensive, but don’t pack the therapeutic punch the atomizing versions do. An ultrasonic diffuser (such as the Home Diffuser) sends a cool mist into the air. The water droplets in the mist are coated with essential oil. No heat is used in the process, so the essential oils are protected. However, due to minor dilution, the therapeutic impact of the oils are affected. Ultrasonic diffusers are also nice for dry climates. Even though they technically aren’t humidifiers, moisture is still being added into the air.
These are also called nebulizing diffusers. The atomizing technology transforms essential oils into a vapor of millions of microparticles, dispersing them into the air and releasing the powerful plant constituents found in Young Living essential oils. This is the best diffusion method for reaping the therapeutic benefits of an oil. The downside of these models is that they go through oils much faster. You typically will not run one as long as you would an ultrasonic model.