What performance issue can indicate problems with airflow in an HVAC system?

Inconsistent temperature throughout the building is a key indicator of airflow problems in an HVAC system. When airflow is restricted or uneven due to ductwork issues, a malfunctioning fan, or blockages, the conditioned air cannot circulate effectively. This can result in hot or cold spots in different areas of the building, leading to discomfort for occupants and inefficient operation of the system. Proper airflow is essential for maintaining a balanced and comfortable indoor environment, as it ensures that each space receives adequate heating or cooling.

Other issues, such as low humidity levels, can arise from various factors but are not necessarily directly linked to airflow. Vibrations from the outdoor unit could indicate mechanical problems but do not provide a clear signal related to airflow efficiency. Unclogged drain lines pertain to moisture removal and drainage rather than airflow distribution. Therefore, the consistent regulation of temperature across different spaces directly correlates with good airflow, making it the most relevant performance issue in this context.