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

Steps to check:

• Open all registers: Ensure supply and return registers throughout the home are open.
• Check filter: Replace a dirty filter to restore airflow.
• Adjust dampers: If manual dampers are installed in branch ducts, adjust them to reduce airflow to overheated rooms and increase to cooler rooms.
• Blower speed: A technician can adjust blower speed taps on the Armstrong Air control board to optimize airflow.