How To Install UV Light In an HVAC System

By | September 7, 2020

How To Install UV Light In an HVAC System
UV lights are a great option for an HVAC system to kill off mold, mildew, and airborne viruses.

This makes them ideal in many scenarios for keeping the air cleaner to breathe.

What Are HVAC UV Lights?
What Are HVAC UV Lights
HVAC UV Lights are bulbs that radiate UV light that kills mold, mildew, and airborne viruses.

UV (Ultraviolet) light is on the lower end of the light wavelength spectrum and is electromagnetic radiation.

The Sun also radiates UV light with roughly 10 percent of the Sun’s output containing Ultraviolet light.

When a person is sunburned this is from the Ultraviolet light the Sun emits.

One of the benefits of short-wave ultraviolet light is it sterilizes areas it comes into contact with.

For HVAC systems this means it can help to sterilize air as it passes a UV light.

How Hard are UV Lights to Install in an HVAC System?
The difficultly of installing UV lights depend on the location of the air handler.

The air handler often contains the evaporator A-coil from the air conditioner and is also often the supply for air into the system.

If there is a gas furnace in a home the air handler is usually located at the bottom of the furnace.

The bottom panel form the furnace should be removed to see the best spot to locate the UV light.

Best Location to Install HVAC UV Light
How To Install UV Light In an HVAC System Location
The air handler is usually the best location to install a UV Light.

While usually mounted in the air handler they can also be mounted at other locations.

All the air in an HVAC system will flow through the air handler making an ideal location.

Where to Buy an HVAC UV Light?
HVAC UV lights can be bought at hardware stores, HVAC companies, and online.

If an HVAC company is hired to install the lights they will have them available.

If you plan to install them yourself buying them online such as Amazon is a good place to read reviews and get the best option.

Example UV Light on Amazon
REKO Lighting R2000 Air Purifier Whole House Uv uvc Light in Duct for HVAC Ac (Air Conditioning) Duct

Caution!! Do not stare directly at a UV light as like the Sun it emits electromagnetic radiation that can hurt your eyes.

How To Install UV Light In an HVAC System

  1. Locate the best spot to install the UV light. Usually in the air handler box.
  2. How To Install UV Light In an HVAC System Step 1

  3. Drill a hole through for the UV light.
  4. How To Install UV Light In an HVAC System Step 3

  5. Insert the UV light and attach it with screws.
  6. How To Install UV Light In an HVAC System Step 4

  7. Plug it in and test it.
  8. How To Install UV Light In an HVAC System Step 5

Installing a UV light is beneficial for many reasons mainly to kill off mold, mildew, and airborne viruses.

Before buying a UV light be sure to examine your HVAC system for the best location to install it.

Many systems can install a UV light in the air handler at the bottom of the furnace.

If your home doesn’t use a furnace and has a heat pump the air handler will be in the packaged unit.

Package units have the return air on one side and the supply on the other side circulating the air in a home.

Often UV light are located on the return side of a packaged system but it can also be located on the supply side.

Have you installed a UV light in your HVAC system? Let us know your thoughts below.


7 thoughts on “How To Install UV Light In an HVAC System

    1. Ken Sendeloski

      There is currently no data to show if UV light kills off the Coronavirus. Since UV light does kill off most airborne viruses it likely does but I hesitate to confirm this.

  1. Justine Clark

    I am curious as to why the uv light needs to be on 24/7. Wouldn’t it be better to come on when the fan comes on and go off when the fan goes off.

    1. Ken Sendeloski

      I suppose you could wire it in on the systems fan motor but this would require modifying the unit.

    2. Anthony

      Mold grows 24/7, not just when the fan is on. I want mine on all the time. When the fan kicks on, I want the air clean.

  2. Tdtradiner

    Question: since the UV light sits on the underside of the A-coil, it is in close proximity to the filter (ours is a thick MERV 11 filter, 16×20) and it seems to be deteriorating the filter material. I usually change the filter every 3 months (even though it should last longer), but the filter is deteriorating and breaking down in even shorter than 3 months. Any suggestions?


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