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Using UV-C lights in HVAC systems cleans and prevents mold growth. As mold breaks down, they decay into toxins and volatile organic compounds (VOC's). VOCs cause an unpleasant odor and can cause allergy and respiratory symptoms in building users. UV-C light is used to remove and prevent mold growth from the inside of heating, ventilating and air conditioning (HVAC) systems.With UV-C lights, coil cleaning is continuous, automatic, environmentally safe and labor-fee.
Consequently, the "air in contact with the coil surface" is reduced, decreasing the efficiency of the air handler. A mold thickness of only 0.0002 inch on adjacent material surfaces of a 10-ton coil can cause air flow to drop by as much as 9% - reducing the overall HVAC system capacity by 3%. Clean coils perform far better, saving energy and avoiding "locker room" odors. UV-C lights remove the need for harsh chemical cleaners.
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Ultraviolet
Light Systems 
The
performance of a cooling coil depends on the amount of time the air is
in contact with the coil surface. When dust and other components adhere
to the coil surface, mold grows on these components and in effect, becomes
an insulator.
