Upon arrival technician found that the systems pressure is at 16/130 when the system is pressure should be 75/150 at the least. Considering the age on the system, and the fact that the system is running on our 22 refrigerant. Means that the coil and condenser at the very minimum Will need to be replaced. Technicians best recommendation would be to replace the entire system and clean the furnace to ensure proper warranty on the system.