AprilAire Automatic Digital Humidity Control

Automatic digital humidifier control works in conjunction with your furnace to control the operation of the humidifier. The control senses indoor RH and outdoor temperature and automatically adjusts the operation time of the humidifier to provide the optimum humidity level in the home. The digital readout on the control displays the RH level inside the cold air return.|Includes outdoor air sensor|Can be used in manual mode when not using the outdoor sensor|Built in blower activation switch|Gives service alerts