Arrived at customer's house for Douglas split cleaning. On arrival customer showed Me Too! Douglas split head. This assembled and began to clean Douglas split. Talk to the customer about UV light and customer decided he would like UV light. Finish cleaning and customer was very pleased with work performed. Unit now runs fine. Returning tomorrow if possible to install UV light and check other 2 air handler units for tune up. Any time after 2 would be best for customer. Collected signatures and explain the customer if he chose to not go with UV light he would be billed for the cleaning today Is installed UV light. Light and system both operating. Customer happy.