HVAC UV light for coil treatment should be installed inside the air handler or supply plenum with a clear, direct line of sight to the evaporator coil and its drain pan so the lamp continuously bathes the wet coil surface. Most microbial growth starts on the coil and pan because they stay cool and damp during operation. Our technicians typically position coil-irradiation UV lights to cover the broadest coil face without shining directly on wiring or plastic components, drawing on extensive local experience across the Las Vegas area.
Place and setup guidance:
- Aim the lamp at the coil face and drain pan rather than into open ductwork.
- Mount close enough for unobstructed exposure, with room to replace bulbs.
- Shield or reroute nearby wires, filters, or plastics from UV exposure.
- Choose coil-irradiation UV (for surface treatment) when odors or biofilm are present. Always cut power to the air handler before installing or servicing a UV lamp.
Updated: 2026-09-22
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