Where should HVAC UV light be installed near the evaporator coil?

HVAC UV light should be installed inside the air handler or supply plenum so the lamp has direct line-of-sight to the evaporator coil and drain pan. This position targets the damp coil surfaces where biofilm and mold commonly form. A technician typically mounts the lamp downstream of the filter and near the coil face, not in the return, to keep UV-C on wet surfaces and off filtration media. Our team frequently adds UV lights during IAQ upgrades in Plano-area homes as part of new AC installs or retrofits. Always have a licensed HVAC technician handle placement and wiring to protect components and avoid UV exposure.

Good placement cues include:

• Clear line-of-sight to the entire coil surface and pan
• Downstream of the filter, upstream of the blower when possible
• Service access for lamp changes; shield UV-sensitive plastics and wiring

Shut off power and avoid looking at or exposing skin to UV-C during any inspection or maintenance.

Updated: 2026-09-29

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