For this super tune-up I inspected the customer's air handler and condenser. The evaporator coil is pretty rusted and when tested in cooling mode the coil was freezing up. I leak searched the coil and found a leak on the loops. At the condenser the contactor was pretty burnt and pitted up. The capacitor was within tolerance. The superheat was highter than the target indicating the system is undercharged because of the leak. I recommend to the customer replacing the system with a heat pump instead of the straight electric that pulls alot of energy and contributing to highter energy bills.