Furnace is running but some rooms are too cold while others are too warm.

Safety: Be cautious when accessing ducts in attics or crawlspaces.

Steps to check:

• Open registers: Ensure all supply registers and returns are open and not blocked by furniture or rugs.
• Adjust dampers: If your duct system has manual dampers, adjust them to increase airflow to colder rooms and slightly reduce to warmer rooms.
• Replace filter: Install a clean filter to maximize airflow.
• Inspect visible ducts: Look for disconnected or crushed ducts in accessible areas.

When to call a technician: Persistent imbalance may require professional duct balancing or modifications.