This sub category is for aroma diffusers. The benefits of natural aroma essential oils has been recognized over 1000 years ago, but one of the best methods to enjoy their remedial qualities is with an aroma diffuser. Aroma diffusers fill the air and your senses with the beneficial aromas of essential oils through a variety of technologies: heat base, fan/cold evaporation, ultrasonic/humidifying, and atomizing/nebulizing.