Big families need big houses, but all that extra square footage makes it harder to keep the entire home at an even and comfortable temperature. Many people get frustrated after feeling like their energy bills are really high, but they’re still not getting the temperature they desire, especially in rooms far from the HVAC equipment.
A zoned system allows you to shut off the air supply to rooms that aren't in use. The system has an easier time keeping the spaces you are using at a comfortable temperature.
Zoned systems also ensure that equal amounts of hot or cold air are directed to every area thanks to increased air pressure when dampers are used. Your ducts may need to be altered so the length of run between your HVAC systems and rooms is shorter. Many HVAC installers include this alteration and optimization when doing a zone retrofitting.