Venstar T4950SCH-IAQ is a smart digital thermostat with a built-in indoor air quality sensor. It is a programmable thermostat with 4H/2C stages. T4950SCH-IAQ is compatible with easy pairing VenNet wireless sensors. It controls humidification, dehumidification & reheat with adjustable timers and dead bands between stages. This allows you to manage your home's heating, cooling, and energy usage (automatically returns to energy-saving setpoints at end of school day) with adjustable timers & dead bands between stages.