Customer wanted quote on duct cleaning of system. Is found both supply and return plenums to be dirty, Evaporator coil dirty and blower wheel dirty. Also found that box filter was not filtering out all dust, Causing dirty system. Recommended a level two duct cleaning and filter media upgrade on 20x25x4 box filter. Customer would like to go through with repair, But was unable to give date. Will call the office tomorrow for scheduling. Found no other issues at this time.