What typical symptom indicates HVAC system inefficiency?

High energy bills are a key symptom of HVAC system inefficiency. When an HVAC system is not operating effectively, it often struggles to heat or cool the space adequately. This inefficiency results in the system running longer to maintain the desired temperature, leading to increased energy consumption. As a consequence, energy bills rise, making it clear that the system is not performing at optimal levels.

In contrast, consistent interior temperatures, quiet operation, and proper airflow indicate that the HVAC system is functioning well. Consistent temperatures suggest that the system effectively maintains the desired comfort level. Quiet operation signifies that the unit is working smoothly without undue strain, which typically correlates with efficiency. Proper airflow demonstrates that air is circulating as intended, ensuring that the system is delivering service without blockage or inefficiencies. Therefore, high energy bills serve as a distinct warning sign of potential issues within the HVAC system that require attention.