I recently completed an air conditioning service for a client. The client had been experiencing issues with their AC unit, such as poor airflow and inconsistent cooling. I arrived at the client's home and performed a thorough inspection of the unit. I identified the problem as a dirty air filter, which was causing the unit to work harder than necessary. I removed the old air filter and replaced it with a new one, which improved airflow and cooling. I also checked the refrigerant levels and added more if necessary. Finally, I performed a system tune-up to ensure that the unit was running efficiently. The client was very pleased with the results and expressed gratitude for the quick and efficient service.