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Today's Hours 8am - 11pm estThe AprilAire AutoTrac humidistat controller 56 is a 24-volt duct-mounted humidistat. It can operate in automatic or manual mode. In automatic mode, it uses the included outdoor air temperature sensor to compare the outdoor air temperature to an internal program and automatically raises and lowers the humidity setting of your home based on how cold it is outside. The purpose of this feature is to reduce or eliminate fogging of your windows. It cannot be wall-mounted. When installed in manual mode it operates without the use of an outdoor air temperature sensor and keeps the humidity setting to whatever level you set it to. Need a part that you don't see on our site? Reach out to a sales representative today!