Upon arrival found ac coil frozen started furnace and checked filter tested and inspected all electrical components and controls on the heating portion of maintenance cleaned flame sensor and drain line performed combustion analysis at this point confirmed evaporator coil had thawed tested and inspected ac electrical components and controls cleaned condenser coil checked refrigerant charge found the system was low gave recommendations to customer customer elected to top off unit for now and seek a replacement unit around October asked customer to contact Greg for a qoute when October arrives. Renewed ma contract balanced unit all operations are normal at this time.