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Overview: The Aprilaire 62 humidistat includes a built in blower activation switch. It also has a digital display on the front cover to show you how humid it is in your home. Comes with outdoor air sensor. Can be retrofit installed on any humidifier with a 24 volt AC control system to make it AutoTrac style. Includes installation instructions. This system is so advanced it automatically lowers and raises the humidity setpoint as the outdoor air temperature changes. Humidistat must be mounted to the return air duct ahead of the humidifier. Same as the model 60 except it does NOT have a Change Water Panel indicator light. It is designed for steam style humidifiers but will work on any humidifier.