Furnace short cycling during sustained winter heating demand
Why it happens here
Long heating periods can expose restricted airflow from a loaded filter, blocked return, or dirty internal components. In older Vailsburg homes, room additions and changed duct paths can also disrupt airflow. The furnace may shut down on a safety limit before the thermostat is satisfied.
Our approach
We check the filter, return path, blower response, and temperature rise, then inspect controls and sensors as the readings indicate. We correct the confirmed restriction or failed component and run the furnace through a complete cycle to see whether it continues operating normally.