Complete 2 system a/c repair and preventative maintenance check. A/C repair upstairs. Checked and found the system low on charge and leaking at the evaporator coil in the attic. Found the system dirty and the duct system dirty. The customer wants to wait to upgrade the system. The customer wants to recharge the system for now and clean the A/C coil. The system is operating at this time but with the leaking coil, the charge will leak out. System operating at this time. Change filter for the customer.