Uneven cooling between rooms or floors

Safety: Use caution when accessing attics or crawlspaces.

• Open registers: Ensure all supply and return registers are fully open and not blocked.
• Adjust dampers: If your Fraser‑Johnston system has manual balancing dampers in the ducts, adjust them to increase airflow to warmer rooms and slightly restrict to cooler rooms.
• Seal ducts: Use mastic or UL-181 foil tape to seal visible duct leaks.
• Professional duct evaluation: For persistent issues, have an HVAC contractor perform a duct design and airflow analysis.