Clogged, dirty filters restrict airflow and reduce a system’s efficiency. When airflow is restricted, the air that by bypasses the filter will carry dirt directly into the evaporator coil and reduce the coils heat absorbing abilities. To ensure efficiency routinely clean or replace filters.
The condenser and evaporator coils collect dirt over time but a clean filter helps to keep the evaporator performing. Debris reduces air flow, insulates the coil and reduces it’s ability to absorb heat. Being exposed to the elements, you can easily see dirt collecting on the fins. Cleaning the coil fins and removing any debris around the coil will ensure optimal performance.
The aluminum fins on evaporator and condenser coils are easily bent and can block airflow through the coil. Air conditioning wholesalers sell a tool called a “fin comb” that will comb these fins back into nearly original condition.Remember to always use caution when performing preventative system maintenance, as ambient conditions (heat load) will increase refrigerant hose temperatures and don’t forget having the right quality parts on hand makes all the difference.
See How To and Which Components to Inspect and watch this video to learn more about Basic A/C Troubleshooting.