Upon arrival client stated she had mold remediation company out and stated she had mold in systems and duct work. Investigated entire systems to find downstairs 5 ton gas furnace and case coil to be original with home (18) years old and outdoor condenser to be relatively new. The downstairs case coil is complicated out and do not recommend pull and cleaning coil due to age and potentially causing major issues such as Freon leak. The downstairs system has a UV lamp in air supply plenum and has completely deteriorated the fiberglass plenum from the inside and is unhealthy. The downstairs ducting appears to be not as bad as the upstairs and can be cleaned and sanitized. For the upstairs 2 ton system that is 10 years old has major duct leakage and has created a moist environment in the attic joint connections and has created an excessive amounts of growth throughout duct work. Made homeowner aware that I do not recommend cleaning and replacement would be a much better permanent solution du