What are some possible manifestations from an overly dirty A/C air filter?

When an A/C air filter becomes excessively dirty, it can lead to various operational issues, one of which includes increased suction causing low-pressure switch activation or tripped circuit breakers. A dirty filter obstructs airflow, creating a situation where the evaporator coil does not receive adequate airflow. This can result in the system becoming overworked, which increases the suction pressure on the compressor.

If the suction pressure rises too high, it can trigger the low-pressure switch, a safety feature designed to protect the system from operating under unsafe conditions. Additionally, the increased suction may lead to higher electrical demand, which can cause the circuit breaker to trip due to overload. This highlights the fundamental importance of maintaining clean air filters for effective system performance and operational safety.