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How To Install UV Light In HVAC | Guide By HVAC Expert

Do you ever worry about the quality of the air you breathe inside your home? Indoor air can often be contaminated with bacteria, mold, and other pollutants. 

Thankfully, there is a solution: installing a UV light in your HVAC system. But how to install a UV light in HVAC? It might sound complex, but with the right guide, it’s a task you can accomplish.

Here’s the essence of the installation process: you begin by switching off the power, mounting the UV light near the coil or air handler, connecting it to the electrical panel, and testing the functionality. 

Just remember, regular UV bulb replacement is crucial for maintaining the effectiveness of the system.

How to Install UV Light in HVAC – Short Answer

The process of installing a UV light in your HVAC system involves some crucial steps. Start by turning off the power supply to ensure safety. Mount the UV light strategically near the coil or air handler for optimal exposure. Connect the power supply to the electrical panel using the provided wiring instructions. Finally, test the UV light’s functionality by restoring power to the system. Always remember routine replacement of the UV bulb, typically once a year, is essential for effective operation.

Why Do You Need to Install UV Light in HVAC?

Ultraviolet light has been used for its germicidal properties for centuries. UV light effectively kills a wide range of harmful organisms, such as bacteria, viruses, molds, and fungi, by disrupting their DNA and RNA, rendering them harmless. When introduced into an HVAC system, the UV light works continuously to purify the air flowing through the system. This constant disinfection ensures that the air you breathe in your home or workplace is as clean and healthy as possible.

Without a UV light in your HVAC system, these microorganisms can build up on the coils and in the ductwork. Over time, this build-up can reduce the system’s efficiency, leading to higher energy consumption and costs.

The Problems of Not Having UV Light in Your HVAC

Not installing UV light in your HVAC system poses risks that might not be evident initially but can have long-term effects. First, the absence of UV light allows for the growth of bacteria and mold. These microbes can flourish in the moist, dark conditions inside your HVAC system, particularly on the cooling coils and in the ductwork.

These biological contaminants not only decrease your system’s efficiency but can also have a negative impact on your indoor air quality and health. Mold spores and bacteria can cause various health issues, from mild allergic reactions to serious respiratory problems.

Another major problem of not having UV light is increased HVAC maintenance costs. The build-up of bacteria, mold, and other contaminants can lead to frequent and costly cleaning or even part replacement.

Can You Install UV Light in HVAC?

The good news is that most modern HVAC systems are compatible with UV light installation. Whether you have a central air system, a ductless mini-split, or a heat pump, you can install a UV light system. The UV light unit is typically installed in the return air duct or near the evaporator coil, where it can effectively kill any bacteria or mold present.

While UV light is effective in killing harmful microbes, it’s essential to note that it can also be harmful to humans. Direct exposure to UV light can cause skin burns and eye injuries. Therefore, it’s critical to take precautions during the installation. Always turn off the HVAC system and the UV light during installation or maintenance to prevent accidental exposure.

Always follow the manufacturer’s instructions when installing UV light in your HVAC system. These instructions typically include safety guidelines to protect you during the installation process.

Step-by-Step Guide to Installing UV Light in HVAC

Installing a UV light in your HVAC system can seem daunting, but with the right tools and a bit of know-how, it’s entirely manageable. 

Depending on the UV light model, you may need a drill, screwdriver, protective gloves, and goggles. 

It’s also crucial to turn off the power to your HVAC system to ensure safety during installation.

Let’s break down the steps one by one:

Step 1: Turn off the power supply

Safety should always be the top priority when working with electrical appliances. Start by shutting off the power supply to your HVAC system. This action reduces the risk of accidental electrocution during the installation process. Remember, electrical safety can never be taken lightly. Make sure you have the right safety equipment such as rubber gloves and eye protection.

Step 2: Mount the UV light near the coil or air handler

Once the power is off, decide where to install the UV light. The most effective placement is where the UV light can shine directly onto the coil surface or into the air handler. This location maximizes exposure to the UV light, killing the maximum number of microbes.

The process usually involves drilling a hole in the ductwork, inserting the UV light unit, and securing it in place. Make sure to follow the manufacturer’s instructions for specific mounting guidelines.

Step 3: Connect the power supply to the electrical panel

After mounting the UV light, the next step is to connect it to the power supply. This step might require some basic electrical knowledge, as you will need to wire the UV light to your home’s electrical panel.

Use the wiring instructions provided by the UV light manufacturer. If you’re unsure about this step, consider hiring a professional. Handling electrical wiring can be risky if you’re not familiar with it.

Step 4: Test the UV light’s functionality

Once everything is in place and wired up, you can restore power to the system. The UV light should illuminate, indicating it’s working correctly.

Check from a safe distance, and avoid looking directly at the UV light to protect your eyes. If the UV light doesn’t turn on, refer to the troubleshooting tips in the instruction manual.

Note: Regular replacement of the UV bulb

For the UV light to function effectively, you need to replace the bulb as recommended by the manufacturer, typically once a year. Regular bulb replacement ensures the UV light maintains its germicidal properties and continues to protect your HVAC system.

Remember to turn off the power before replacing the bulb and wear protective gloves to prevent direct skin contact with the bulb. This step is vital to maintain the effectiveness and longevity of your UV HVAC system.

By following these steps carefully, you can successfully install a UV light in your HVAC system and enjoy the benefits of cleaner, healthier air in your home.

Troubleshooting Common Installation Issues

While the installation process is relatively straightforward, you may encounter some issues. For instance, the UV light may not turn on, which could indicate a problem with the power supply or bulb. Check the connections and the bulb and replace them if necessary.

If you’re not comfortable dealing with these issues, it’s advisable to call for professional help. An HVAC technician can safely and effectively install the UV light and ensure it’s functioning correctly.

Benefits of Installing UV Light in HVAC

Here are some amazing perks of installing UV lights in HVAC that you must know. 

1.  Improved Air Quality

One of the significant benefits of installing UV light in HVAC systems is the improvement of indoor air quality. The UV light kills bacteria, viruses, mold, and other harmful microorganisms, thus reducing the number of airborne contaminants.

Not only does this contribute to a healthier living environment, but it can also alleviate symptoms in people with allergies or respiratory conditions.

2. Lower Maintenance Costs

Another advantage of UV light installation in HVAC systems is the potential for lower maintenance costs. By keeping the evaporator coils clean, the UV light reduces the need for frequent professional cleanings, thus saving you money in the long run.

Additionally, the improved efficiency can result in less strain on your system, reducing the need for costly repairs or premature replacement.

3. Enhanced HVAC Performance

UV light can greatly enhance your HVAC system’s performance. By keeping the coils clean, the UV light allows the HVAC system to cool the air more efficiently. This means your system doesn’t have to work as hard to keep your home comfortable, leading to lower energy consumption and, therefore, lower energy bills.

The addition of UV light also means fewer system breakdowns and a longer lifespan for your HVAC system.


Installing a UV light in your HVAC system can significantly enhance the quality of your indoor air, improve the efficiency of your system, and decrease maintenance costs. Following the outlined process on how to install UV light in HVAC, you can achieve these benefits without needing professional intervention. However, it’s crucial to prioritize safety at all times, especially when handling electrical wiring. If at any point you’re uncertain, it’s better to seek professional help.

Browns Heating & Cooling is offering a one-point solution for all your HVAC Needs in Chicago since 2016. Call us or book an appointment online for UV Light installation in your HVAC system. 

With a UV light-equipped HVAC system, you’re set to enjoy a healthier, cleaner indoor environment.


What is the best location to install a UV light in my HVAC system?

The optimal spot to install a UV light in an HVAC system is near the coil or air handler, ensuring direct exposure to the UV light which maximizes its germ-killing effectiveness.

How often should I replace the UV bulb in my HVAC system?

The UV bulb in your HVAC system should typically be replaced once a year. Regular replacement ensures the UV light maintains its germicidal properties, safeguarding your HVAC system.

Can I handle the electrical wiring while installing the UV light myself?

Yes, you can handle the electrical wiring if you have basic electrical knowledge. However, due to safety concerns, if you’re unsure, it’s recommended to seek professional help.

How does the installation of a UV light benefit my HVAC system’s performance?

Installing a UV light in your HVAC system enhances its performance by eliminating mold and bacteria, reducing the need for frequent cleaning, and potentially extending its lifespan.