There are a large selection of mist humidifiers available on the market and figuring out the differences between the types can be quite confusing. Mist humidifiers utilize primarily four different mechanisms for delivery of the water mist: wicking, steam, cool mist, and ultrasonic. For best use, mist humidifiers that produce obvious steam or mist should be placed on a high surface. This allows for an adequate distance to permit the steam or mist to become absorbed into the ambient air. Any cold surfaces will cause the steam or mist to condense quickly instead of being soaked up into the air.