When there are areas in your house that are always warmer or colder than others, there can be many explanations for this. basements typically too cold. Rooms with vaulted ceilings have a difficult time retaining heat, while rooms that receive long hours of sunlight are often difficult to cool down.
Regardless of why, a duct system zoning system maybe the answer for you. It involves multiple thermostats which operates dampers within the ductwork of your forced-air system. The thermostats constantly read the temperature of their specific zone, then open or close the dampers as well as operates your HVAC system . zoning is helpful for houses with inconsistent area temperatures, it's also great for controlling heating or cooling for individual bedrooms such as master bedrooms, or an empty guest room based on demand.
zoning works particularly well with evolution multi stage systems and even
better with variable refrigerant flow, VFR systems.