Keeping your indoor coil clean is very important. Mold, Mildew, Germs, and other nasty stuff grows on a dark, dirty, & moisture environment. Ultraviolet lights mounted in the Heating, Ventilating, & Air Conditioning (HVAC) system are used for disinfection to kill mold, bacteria, and viruses, including the SARS-CoV-2 virus which causes the COVID-19 disease. Ultra Violet lights have been proven to destroy 99.98% of the SARS-CoV-2 virus when properly used.