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

HVAC UV‑C light should be installed inside the evaporator coil compartment with a clear line of sight to the coil surface. The coil area stays damp and can accumulate organic films, so bathing that surface in UV‑C is what stops microbial growth. We also place airstream UV units in the supply plenum when the goal is to treat moving air rather than the coil itself, and we’ll match the approach during an IAQ upgrade based on your system. A simple rule we use: if the coil is deep, two shorter lamps facing the coil from opposite sides reduce shadowing and improve coverage. We install coil‑treatment UV‑C on systems throughout the Worcester area as part of tailored filtration and purification plans.

Good placement checks include:

• Direct exposure on the widest coil face without obstructions
• Mounting that avoids non‑UV‑rated plastics and wiring
• Airstream units set in the supply plenum for air treatment
• UV lamp replacement every 1–2 years per model

Always shut off power before opening the air handler and have a licensed tech confirm UV type and placement for your system.

Updated: 2026-09-30

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