My HVAC contractor says I should add zone dampers to my HVAC system, what are they?
A zoned system is one in which areas of the house that differ greatly in temperature are each given their own thermostat. These thermostats control the temperature in individual rooms or areas by opening and closing dampers that are installed in your air ducts. Those dampers are called zone dampers. Additionally, the thermostat will turn on the HVAC system whenever one or more of the room thermostats is calling for a temperature change.