Performed yearly maintenance and safety checks on 21 Bryant ac system. Found 60 voltage absorption system reading 58.8. Advised bushes could be trimmed back to allow better airflow. Drier vent behind bushes has allowed condenser to be very dirty. Advised customer should keep up on maintenance and possibly think about a second wash down a year. Trimming bushes may also help unit stay clean. Advised customer of surge protection and hard start accessories. Ballparked 350 for one or 550 for both. Customer will talk with husband and call back if wanting to proceed