SmartVent Lite+ is a home ventilation system that monitors both temperature conditions and humidity to ensure that you are protecting your home or rental property with quality air always circulating and keeping the property dry. As a temperature and humidity based solution, in winter, SmartVent Lite+ not only introduces air faster when warmer and slower when cooler, the system also measures the moisture content in the home and of the incoming air and uses this data to reduce under. or over, ventilation.