Client getting an odor in a home. Client says it smells like mildew. Did a complete inspection of air handler and ductwork. Air handler is only six months old, however, there should be UV lights present in air handler to prevent biological growth buildup. Ductwork is dirty and his biological growth. Recommend recommended installing air purifier, clearing all ductwork and sanitizing. Client approved all work to be done and scheduled to come out on Tuesday, June 24. Client paid 50% deposit and signed up for membership.