What symptom might indicate that the filter in an HVAC system needs changing?

A significant increase in utility bills can be an indicator that the filter in an HVAC system needs changing. When the filter becomes dirty and clogged, it restricts airflow, making the system work harder to maintain the desired temperature. This increased workload leads to higher energy consumption, which is reflected in the utility bills.

Maintaining a clean air filter is crucial for the efficiency of an HVAC system. A system that operates under strain not only incurs higher operating costs but can also lead to premature wear and tear, resulting in more significant repair needs in the future. Therefore, monitoring utility bills for unexpected increases can serve as a practical diagnostic tool for filter maintenance.