Completed UV light installation in air handler today. System needed better air quality protection. Mounted UV-C germicidal lamp after main filter to maximize effectiveness. Ensured proper shielding and safety cutoffs are functioning correctly. Explained maintenance schedule to homeowner - bulb replacement needed annually. Left extra protective eyewear in utility closet for when filter changes are done. System now providing enhanced protection against airborne contaminants and surface biofilm on coils. Homeowner already noticed reduction in musty odor.