Arrived at customers residence and was greeted by customer and was led to the basement and arrived at air handler and found that there is a smell of heavy ozone in the air causing the smell to fix issues suggested to customer to have fan motor run continuous to allow smell to dissapate at this time which after running system for several minutes smell has been eliminated at this time. Also customer decided to a single duct cleaning performed at this time. Customer stated that he would like to have me as his preferred technician at this time.