The answer to 'best zone control system' is a zoned HVAC system, which allows you to independently control the temperature in different areas or 'zones' of your home. This can provide more efficient and customized heating and cooling, saving you money on energy costs. Zoned systems use multiple thermostats and dampers in the ductwork to regulate airflow to each zone.
Zoned HVAC systems are ideal for homes with multiple floors, additions, or rooms that are difficult to heat or cool evenly. They give you the ability to adjust the temperature in specific areas based on occupancy and usage patterns, rather than heating or cooling the entire home at the same level. This can lead to significant energy savings over a traditional single-zone HVAC system.