A UV light is an ultraviolet lamp installed inside your HVAC system, usually near the evaporator coil or in the air handler, that emits UV-C wavelengths to disrupt the DNA of mold, bacteria, and other microbes. This keeps the coil and drain pan from growing biofilm, which helps airflow and can reduce musty odors. Two common types exist: coil sterilization lamps that run around the clock, and air sterilization lamps that treat moving air inside the ductwork.
/ˌjuː ˈviː laɪt/
A UV light is an ultraviolet lamp installed inside your HVAC system, usually near the evaporator coil or in the air handler, that emits UV-C wavelengths to disrupt the DNA of mold, bacteria, and other microbes. This keeps the coil and drain pan from growing biofilm, which helps airflow and can reduce musty odors. Two common types exist: coil sterilization lamps that run around the clock, and air sterilization lamps that treat moving air inside the ductwork.
Do UV lights in HVAC systems actually work?
Yes, for what they are designed to do. UV-C lamps aimed at the evaporator coil are proven to stop mold and biofilm buildup, keeping the coil clean and airflow strong. Air-sterilizing lamps can reduce some airborne microbes, though results depend on exposure time.
Source: The Cooling Company
In a Las Vegas home, the AC runs for months straight, and the cool, damp evaporator coil is a perfect spot for mold to settle. A coil UV lamp mounted in the air handler shines on that coil continuously, keeping it clean so the system moves air efficiently and the vents stay fresher.
Replace the UV bulb about once a year even if it still glows. The lamp loses germicidal strength long before the light dims, so a bulb that looks fine may no longer be killing anything.
“Replace the UV bulb about once a year even if it still glows. The lamp loses germicidal strength long before the light dims, so a bulb that looks fine may no longer be killing anything.”
The same UV-C wavelength used in HVAC coil lamps, around 254 nanometers, is the technology hospitals and water treatment plants have relied on for decades to disinfect surfaces and drinking water.
Where is a UV light installed in my AC system?
Most coil-sterilizing UV lamps mount inside the air handler so the light shines directly on the evaporator coil and drain pan. Air-treatment lamps sit in the return or supply ductwork to hit moving air.
Are HVAC UV lights safe for my family?
Yes, when installed correctly. The lamp is sealed inside the ductwork or air handler where no one is exposed, and it only runs in that enclosed space. Just avoid looking at the bulb while a service panel is open.
Will a UV light lower my energy bills?
Indirectly, yes. By keeping the coil free of mold and grime, the lamp helps the system transfer heat and move air efficiently. A clean coil runs closer to design efficiency, which can trim runtime in our long cooling season.
Need help with uv light? Our licensed technicians in Las Vegas are ready to assist.
Fill out the form below. Our goal is to reach you within minutes.
