Besides the operational humming of an HVAC, any kind of erratic or loud noise should never be ignored. Such noise is usually a sign of a malfunctioning component or a broken part inside the furnace.
Upon witnessing such irregularities, customers should inspect their vents and chimneys to identify any foreign particles stuck in the airflow. If no noticeable cause is found, an HVAC service Crawfordville can help resolve the issue.