09/03/2026
🚨 HVAC TIP: THAT UV LIGHT IS INSTALLED WRONG — HERE’S WHY
A UV light isn’t useful simply because it’s turned on and glowing blue. Placement matters.
In this installation, the UV lamp is hanging vertically in the cabinet/plenum rather than being positioned to properly expose the evaporator coil and the surfaces where biological growth can develop.
A UV-C system needs the correct location, orientation, distance, and exposure time to accomplish what it was installed to do.
When a UV lamp is placed where it has limited direct exposure to the coil:
❌ Much of the UV energy isn’t being directed where it’s needed
❌ Parts of the coil can remain outside the effective UV exposure area
❌ The lamp may illuminate the surrounding cabinet without effectively treating the coil surface
❌ Simply having a bright UV lamp doesn’t mean you’re getting effective coil treatment
❌ Installation should follow the manufacturer’s required mounting position and clearance
UV-C is not a “hang it anywhere in the air handler” accessory. The goal is to position it so the UV energy provides adequate exposure to the intended target while also protecting wiring, plastics, insulation, and other components from unnecessary UV exposure.
And here’s the important part:
👉 You can’t judge a UV installation by whether the bulb is glowing. You have to look at what it’s actually illuminating and whether the installation meets the manufacturer’s requirements.
This is exactly why HVAC work is about more than changing parts. Installation, airflow, static pressure, coil condition and UV placement all matter.
🏆 35+ YEARS EXPERIENCE IN DUCTWORK INSTALLS AND SERVICE
The HVAC Guru LLC
Teaching-based Residential & Light Commercial HVAC Contractor
Specializing in diagnosing what others won’t.
📞 727-589-7115
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👤 Joel Reynolds — Owner
📋 CAC1823492
Residential • Cooling • Heating • Indoor Air Quality
