What is a common indicator that there may be an issue with the system airflow?

Ice buildup on evaporator coils is a common indicator that there may be an issue with system airflow. When airflow is restricted, it can lead to a drop in temperature on the evaporator coils, causing moisture in the air to freeze. This can eventually result in a solid layer of ice forming, which blocks the coils and significantly reduces the system's efficiency.

In healthy systems, warm air flows over the coils, allowing for proper heat exchange. If airflow is obstructed due to dirty filters, blocked ducts, or other issues, the coils cannot function as intended, leading to potential ice accumulation. Recognizing this symptom can prompt timely maintenance actions to resolve airflow issues and restore system function, thereby preventing further damage or inefficiency.

Other choices may indicate different problems within the system, but they do not specifically point to airflow issues in the same way that ice buildup does.