Why it matters to you
Two-story Charleston homes routinely run several degrees hotter upstairs because heat rises, the attic radiates heat down, and the ducts were designed for the main floor. Zoning lets one system prioritize the bedrooms at night instead of overcooling downstairs.
Practical guidance
Try the simple fixes first — open upstairs registers, clean the filter, and have attic ducts checked for leaks. If one thermostat still cannot satisfy two floors, ask whether the ductwork and equipment can support zoning; variable-speed equipment generally handles zoned airflow better than single-stage units.
