I arrived at the customer's home to find a drain pan that had separated from the evaporator coil and was dripping water into the system. The evaporator coil was dirty, which may have contributed to the separation. The unit would occasionally freeze up during cooler days due to a lack of airflow across the coil. The system was a 4-ton unit installed in a 2400-square-foot house. I recommended downsizing to a 3 1/2-ton unit to provide adequate cooling. The customer signed an estimate to have the equipment installed on Monday.