Arrived at customer's house for system tune up 1. On arrival Went to airhandler system. Inside unit was clean. Unit was producing proper Delta T. Filter was in backwards and should be changed more regularly. Vacuumed out drain line. Next went to condenser and hooked up gages. All pressures and readings were of acceptable range. Contactor sending proper voltage. Capacitor was well below name plate rating. Informed customer of this and suggested we get changed. Also suggested customer get surge protector due to unit being very close to water and on top of a roof. Customer agreed to Work suggested. Installed capacitor and surge protector. Started up unit and unit started and is cooling fine. Checked in with customer and customer is happy. Collected payment and signature and left.