I was called to a home to address a low temperature drop and a dirty condenser coil. Upon arrival, I found that the system had a low refrigerant charge, which was causing the unit to struggle to maintain the desired temperature. I performed a thorough inspection of the system and found that the condenser coil was extremely dirty, which was causing the unit to work harder than necessary. I cleaned the coil and adjusted the blower speed to ensure optimal airflow. After completing the repairs, the system's temperature dropped by 19°F, and the customer was satisfied with the results.