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Read our privacy policyMister-MINI® humidifiers operate by dispersing a fine mist into the warm air supply duct of your heating system. The water is evaporated by the warm air from the furnace and carried into your home by the furnace air flow. The result is improved indoor air quality and increased comfort. The Mister-MINI® humidistat and built-in temperature switch automatically control the operation of the humidifier to ensure that the proper amount of humidity is achieved. The built-in temperature switch prevents operation if the temperature in the warm air duct is not high enough to ensure effective evaporation. The universal humidistat, installed either on the wall or in the cold air return duct, turns on the unit when the humidity level in the home is below the set-point.