Using UV lights for cleaning and sanitizing air conditioning systems is a way to get rid of unwanted molds and bacteria. The warmth and moisture found in the Heating, Ventilation and Air Conditioning systems of households and office buildings make the perfect breeding ground for airborne molds, microorganisms and bacteria. To compound matters, HVAC systems circulate viruses and germs around an entire office building or home in a relatively short time. Installing UV lights in Air conditioning systems as a great way to purify the air.