Technician Aaron diagnosed a serious leak in the system on 6/18/13 and discussed the alternatives: leak tracing, repairing and refilling at very high cost per pound of obsolete freon type or replacing the whole system. I decided that replacing the system made sense. The replacement was scheduled for Friday 6/21/13. Ron and Cody arrived at 8 am and finished by 10 am. They installed a 4 ton AC condenser and new coil in the furnace.