Ultraviolet (UV) air treatment system coil-plus, 120-volt (AC), complete kit for return air or coil irradiation. Kills airborne bacteria and surface mold to keep air conditioning systems clean, efficient and worry-free. UV coil irradiation lamp reduces microorganism and mold growth in moist locations and reduces inhalant and odor irritants at the source. Kills up to 99.9% of mold on system cooling coils. Tests show reduction in colony-forming aspergillus Niger mold spores when surface was irradiated at a distance of 18 inches for three hours in still air.