What is the likely consequence of running an A/C unit with a dirty air filter?

Running an A/C unit with a dirty air filter primarily leads to reduced airflow and cooling. This happens because the air filter's primary function is to trap dust, debris, and other particulates from the air moving through the system. When the filter becomes clogged, the airflow is restricted, causing the A/C unit to work harder to pull air through the filter.

As a result, the system may struggle to maintain the desired indoor temperature, leading to decreased cooling efficiency. Reduced airflow can also promote ice buildup on the evaporator coil, further restricting airflow and potentially causing the compressor to overheat or fail. Regularly replacing or cleaning the air filter is essential for maintaining optimal performance, efficiency, and comfort.