Arrived at customer's house for system inspection. On arrival customer showed me to air handler unit. Open cabinet and saw bio growth. Pointed out to customer and suggested IAQ. Left literature with customer. Unit. Unit producing proper Delta T. Next went to condenser. Open up electrical cabinet and tested components. Capacitor within acceptable range. Contactor within acceptable range. Unit is loud on start up. Suggested hard start kit and customer agree. Installed hard start kit and start it up unit. Unit started up fine. Checked in with customer and customer is happy with word for forms. Signed customer up for tabs planned. Collected payment and signature and left. Customer happy.