What do high energy bills often indicate in relation to HVAC systems?

High energy bills typically indicate possible leaks or inefficiencies in HVAC systems. When a system is not operating as it should, it can consume more energy than necessary to maintain the desired temperature. For example, if there are leaks in ductwork, airflow may be compromised, leading to the system running longer to compensate for the lost conditioned air. Similarly, inefficiencies such as an outdated system, poor insulation, or malfunctioning components can cause the HVAC system to draw more energy to perform its duties, resulting in elevated energy bills. This represents a clear sign that the system may need maintenance or repairs to restore its efficiency, reducing energy consumption and associated costs.