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Insufficient airflow through the evaporator coil can lead to several adverse effects on an HVAC system, particularly frost buildup and decreased cooling performance. When airflow is restricted, the refrigerant in the coil does not evaporate completely. As a result, the temperature of the coil drops significantly, causing ice to form on the surface. This frost buildup acts as an insulator, further impeding airflow and drastically reducing the system's ability to cool the air effectively.

Additionally, this condition can lead to higher energy consumption as the system works harder to try and maintain temperature, which can also result in increased wear and tear on the components. Eventually, prolonged insufficient airflow might lead to further complications, such as compressor damage because of the system’s inability to maintain proper operating conditions. Understanding the role of proper airflow is crucial for maintaining HVAC efficiency and effectiveness.