Performed 1 system diagnostic for whole home unit. Furnace is 16 years old and ac coil is 31 years old. Customer had power failure caused by store that cause a power surge.Found failed control board,failed transformer, no flood protection,dirty blower wheel, filing run cap. Due to age of unit and cost or repairs recommended replacing system. Will need to do repairs to find if any other electrical components are damaged. Based on our findings today, it might be time to think about getting a brand new system.