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

Safety first: Turn off power before removing any panels or reaching into duct openings.

Steps to check:

• Register adjustment: Slightly close registers in overheated rooms and fully open registers in cold rooms.
• Check for duct leaks: Inspect accessible ducts near the furnace for disconnected joints or large leaks and seal with UL-listed foil tape (not cloth duct tape).
• Filter and airflow: Ensure filter is clean to maintain proper airflow.

Persistent imbalance may require a professional to adjust duct dampers and blower speed settings.