For this heating tune-up I inspected the customer's air handler and evaporator coil. The system is in dire shape and needs a deep coil and blower clean as they are completely covered in dirt and hair that is affecting the efficiency of heat absorption in cooling mode. The heat strips are working well and heating the home, however with the age of the system I would not recommend cleaning the coil as it could damage it and cause a leak of refrigerant. I do not recommend moving forward with refurbishment, but rather system replacement. Customer may call in or have us back out when they are able to move forward with replacement or would like to get a quote to replace.