Complete system tune up, in sugar hill Ga. two systems. Customer has $49 tune up coupon. Checked all electrical and mechanical components.replaced filters. Found evaporator coil to be rusty and corroded and likely to leak refrigerant. Found both systems not to have any water protection under the evaporator coil. Recommend having to protect system. Recommend installing hard start kits to help system run smoother and last longer. System is function correctly at this time.