How To Install A HVAC UV LightChoose the location where you will install the HVAC UV light. …Drill hoes for UV light. You can consider drilling holes into the air handler where the light bulb will penetrate inside. Only long UV bulbs will enter inside.Screw the UV light to a furnace. The HVAC UV light tool comes with screws that you can use to install it. …Power your HVAC AC light system. After you have secured your light to a furnace, you can power it on. …Change and clean the UV light bulb. Many of the HVAC UV bulbs do last like one year. …