Furnace runs but some rooms are too hot while others are too cold.

Steps:

• Open all registers: Ensure supply and return registers are fully open and not blocked by furniture or rugs.
• Adjust dampers: If your duct system has balancing dampers, slightly close those serving overheated rooms and open those serving cold rooms.
• Inspect for duct leaks: Look for disconnected or damaged ducts in accessible areas and seal with mastic or UL-listed foil tape.

If problems persist, a professional airflow and duct design evaluation may be needed.