G.A.S Day & Night Dehumidifier ControllerG. A. S Day & Night Dehumidifier Controller A simple but genuinely useful dehumidifier controller that lets you set different target humidity levels for day and night cycles. Use the dials to set your preferred humidity for lights on and lights off periods, plug your existing dehumidifier into the controller, and let it handle the rest. Designed for growers who already own a dehumidifier and just need smart on off control. Why growers choose the Day &