The answer to 'what does zone control system do' is a zone control system allows you to independently control the temperature and airflow in different areas or 'zones' of your home. This provides greater energy efficiency and comfort compared to a traditional single-thermostat HVAC system.
With a zone control system, you can set different temperatures in different rooms or areas based on your preferences and usage. For example, you may want the bedrooms cooler at night, the living room warmer during the day, and the basement at a different temperature than the upper floors. The zone control system uses motorized dampers in the ductwork to direct airflow to the zones that need heating or cooling, minimizing energy waste.