The Leviton IPHS5-1LW offers a convenient way to help reduce condensation in areas of the home prone to dampness and high humidity, like bathrooms and basements. The Leviton humidity sensor and Fan Control automatically detect excess humidity in a room and responds by turning on the ventilation fan. The sensor continues to monitor the air and automatically turns the fan off when the humidity level has dropped. The humidity sensor and fan control can help reduce energy usage by operating the fan only when needed to control excess humidity.