Performed water heater tune up. Flushed water heater. Performed cooling tune up. Flushed drain line. Cleaned condenser coil. Checked all major components. Found that current filter is not correct size and is allowing dirt to get by it. This is causing evaporator coil to become impacted. Ducts are very dirty. No power surge protection for condenser. Filter rack will need to be modified to accept new filter, current filter box 17 3/4†wide by 22†long. Customer using snap financing, approved for $2700. Was originally going to do duct cleaning and IAQ 1000, now only doing evaporator coil cleaning and IAQ 1000.