The most common versions of this type of diffuser are the Scent Ball and Car Scenter. Both use a small square cotton pad that is saturated with the essential oils then placed in the diffuser where it comes in direct contact with a ceramic or metal plate. The diffuser is plugged into a wall outlet or a car lighter well and uses AC to lightly heat the pad, slowly releasing the scent. These diffusers can effectively scent a small space with continuous diffusion (up to 3 hours per application). You can control the intensity by how much essential oil you apply to the pad and refresh as needed or desired. They cost between $10 and $15, but replacement pads can sometimes be difficult to find.
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Fan-based electric diffusers like the Spa Scenter are an excellent way to quickly or continuously fragrance a larger space. Like the Scent Ball and Car Scenter, they also use cotton pads though round and larger. Essential oils are applied to the cotton pad in varying amounts depending on desired strength of the scent, but instead of using heat to release the scent, the pad is placed over a variable speed fan that blows cool air through the pad and out of the unit. These units run somewhere in the $30 to $50 range and are relatively quiet making them the perfect choice for creating a home spa environment. They can be connected to a timer for more efficient unsupervised use.