UV Lights For HVAC Systems: Are They Worth It? (2024)

Over the years, I’ve seen my fair share of infestations – mold, bacteria, you name it. These pesky critters can wreak havoc not just on your home but also on your health. That’s why I always recommend my clients invest in ultraviolet (UV) lights for their HVAC systems.

These little workhorses pack a powerful punch, sanitizing the air as it circulates through your ductwork and killing off harmful microbes before they can take hold.

Trust me, the benefits are worth it. Not only will UV lights help keep your indoor air quality top-notch, but they’ll also extend the lifespan of your HVAC system by preventing buildup and gunk from accumulating. And let’s not forget about the potential health risks that come with breathing in contaminated air – UV lights can help nip those in the bud.

Of course, like any worthwhile investment, UV lights do come with a cost – both upfront for installation and ongoing for maintenance. But in my experience, the peace of mind and long-term savings make it a no-brainer. Stick around, and I’ll cover everything you need to know, from safety tips to finding the best HVAC pros in your area to get the job done right.

If you’re already sold on the benefits of UV lights for keeping your HVAC system clean and safe, use the tool below to find the best HVAC installers in your area to find the best deal on installing UV lights for your HVAC system.


  • Air sanitizing systems are one of the best ways to keep the air circulating in your home free from contaminants and safe to breathe.
  • HVAC UV lights are relatively affordable, especially compared to air filtration systems like air purifiers and filters.
  • Installing UV lights in your HVAC system is straightforward, although most people should leave it to a professional.

What Are the Benefits of a UV Light in Your HVAC System?

Air sanitizing systems are one of the best ways to keep the air circulating in your home free from contaminants and safe to breathe. Ultraviolet (UV) light’s utility for sterilization has been known since the late 1800s and became prevalent around the turn of the century when it played a key role in disinfecting hospital equipment to prevent the spread of tuberculosis.

UV light has germicidal properties, making it great for sanitizing air as it passes through your HVAC system. HVAC UV light systems use a special type of high-frequency low-wavelength UV light called UV-C to destroy the nucleic acids that make up the DNA in harmful airborne bacteria and sanitize the air as it passes through the system.

HVAC UV lights are also good at limiting mold growth throughout your HVAC system, preventing certain respiratory illnesses. The most common type of HVAC light is an in-duct light that goes near your central air system’s blower. Some HVAC systems also use UV lights to prevent mold from growing on the evaporator coil.

The evaporator coil holds the refrigerant that your AC unit uses to cool your home and is a breeding ground for mold spores that love cool, condensation-rich environments. You might also see these electronic air filters used to sterilize the condenser coil and drain pan.

A final benefit to installing UV-C lamps in your HVAC system is that they also destroy volatile organic compounds (VOCs), which cause unpleasant odors reminiscent of tobacco smoke. While not all VOCs cause health issues, their strong smells are undesirable and hard to ignore.

What Are the Types of UV Light?

There are several types of UV lights used in HVAC systems, each designed for specific applications. The three main types are:

1. Air Sanitizing UV Lights

These UV lights are installed inside the ductwork or air handler of an HVAC system. As air circulates through the system, it passes by the UV light, which helps kill airborne microorganisms like bacteria, viruses, and mold spores. Air sanitizing UV lights are effective at improving indoor air quality by reducing the number of harmful contaminants in the circulating air.

2. Coil Sanitizing UV Lights

Coil sanitizing UV lights are installed near the indoor evaporator coil of an air conditioning system. The evaporator coil is prone to collecting moisture, which can lead to the growth of mold and bacteria. The UV light shines directly on the coil surface, preventing the buildup of these contaminants and keeping the coil clean.

3. Condensate Pan UV Lights

These UV lights are installed above the condensate pan, which collects moisture that drains from the evaporator coil. Stagnant water in the condensate pan can become a breeding ground for mold and bacteria. The UV light helps sanitize the pan and prevent the growth of these microorganisms.

Each type of UV light serves a specific purpose in improving indoor air quality and maintaining a clean HVAC system. In some cases, a combination of these UV lights may be used for maximum effectiveness.

Today’s Homeowner Tips

Once installed, UV lights require very little maintenance and only need attention when they need to be cleaned or replaced. The only downside is that working with UV lights can be dangerous, so you need to hire a professional to install them or take some safety precautions if you decide to DIY.

Source: Regency Lighting

How Much Do HVAC UV Lights Cost?

HVAC UV lights are relatively affordable, especially compared to air filtration systems like air purifiers and filters. The initial cost of installing HVAC UV lights is between $200 and $600 for coil sanitizing lights and between $250 and $700 for air sanitizing lights. These estimates include equipment and installation, although labor rates will vary depending on your location.

For both coil sanitizing and air sanitizing systems, the cost of replacement UV light bulbs ranges from $10 on the low end to about $75 on the high end.

One thing to remember is that running HVAC UV lights will increase your electric bill. Your specific increase will depend on how many lights you need and what type you choose, but most people report an increase in their monthly energy bill of between $15 and $30.

How To Install UV Lights in Your HVAC System

Installing UV lights in your HVAC system is straightforward, although most people should leave it to a professional. Most HVAC contractors don’t allow unlicensed work on their systems, so make sure you understand your service agreement before making any changes to your system. Your HVAC company might void your warranty or refuse to service your system if you work on it yourself.

With that out of the way, here are the steps you’ll need to follow to install UV lights. The following sections will run you through the entire UV light installation process, step by step.

  • Step 1: Prepare Tools and Materials
  • Step 2: Choose a Location
  • Step 3: Drill the Hole (or Holes)
  • Step 4: Mount the Lamp
  • Step 5: Connect the Power to the System
  • Step 6: Maintain and Change the Bulb as Needed

Step 1: Prepare Tools and Materials

The only tools you really need are a drill and a hole saw drill bit. The other equipment you need will come with the HVAC UV light system. Most hardware stores sell HVAC UV light kits.

You should check the UV system you purchase for information about the mounting hole size before you start to make sure you have an appropriately sized drill bit. Most HVAC UV lights require a mounting hole between 1.5 and 3 inches.

Step 2: Choose a Location

I recommend installing a UV light system designed to sanitize the air in your air handler’s return air duct. This air-sanitizing UV lamp is well-suited for residential HVAC systems because they’re affordable, easy to install, and sanitizes the air when the AC or furnace runs.

A more complicated system with lights mounted throughout the ductwork will be better at keeping your system clean, but it is more difficult and expensive to install.

Step 3: Drill the Hole (or Holes)

If you choose a system that can be mounted to the return air duct, you’ll probably only need to drill one hole. Mounting UV lights throughout your system’s ductwork will require more work and isn’t recommended.

Make sure to check — and double-check — the instructions that come with your UV light before you start drilling. The hole’s location doesn’t need to be precise, but make sure it’s relatively centered on the return duct casing; you don’t want to install the light too close to the return filter.

Installing the light as close to the center of the duct as possible will make sure that as much of the air is bathed in the UV light as possible when your AC or furnace is running.

Step 4: Mount the Lamp

Screw the lamp into the air handler with the included mounting screws. Mounting it this way will allow the UV light to scrub the air from your furnace and your central air system if you have one. Attach the unit to the duct with your drill or a screwdriver.

Step 5: Connect the Power to the Furnace

Most HVAC UV lamps are designed to be able to draw power from the blower so that they only run while the air handler is on. That means when your furnace or central AC system blows air through your home, the UV light will turn on — when no air is circulating, the light will shut off to conserve power.

If you have experience with electrical work, you should consider hardwiring the UV lamp to your system. Otherwise, plug the UV light into a nearby outlet using an extension cord with the appropriate rating.

Step 6: Maintain and Change the Bulb as Needed

UV-C bulbs have a lifespan of around one year, but you’ll want to clean them a few times yearly since they tend to accumulate dust. Once every three months, turn your HVAC system off, remove the lamp, and wipe the UV bulb down with a soft cloth. If the bulb is especially dirty, you can use an ordinary glass cleaning solution.

Safety Considerations When Installing an HVAC UV Light

UV light isn’t good for our skin or eyes, so it’s important to install HVAC UV lights correctly to make sure your safety during the installation and throughout your day-to-day life. Never look directly at a UV lamp— even a brief exposure to UV light can cause permanent damage to your eyes.

Always wear eye protection when working with UV-C lights. Safety glasses that provide UV-C protection are incredibly cheap and offer insurance against accidental exposure.

Today’s Homeowner Tips

It’s extremely important to ensure that it’s impossible to see the UV lamp once installed in your air conditioner system. Double and triple-check the enclosure and ensure no holes or gaps before powering on the UV light.

Final Thoughts on UV Lights for HVAC Systems

UV lights are one of the best upgrades you can do for your home HVAC system. UV lights are the best way to keep the air you breathe safe. They’re inexpensive, effective, and easy to maintain, making them a no-brainer for anyone with a home HVAC system.

Even if your HVAC system has a high-quality air filter, adding a UV light will help kill microorganisms and bacteria that might be small enough to slip through the filter. It will also prevent mold and mildew from growing in your ductwork, which an air filter or purifier won’t prevent.

I recommend hiring a professional HVAC contractor to install your UV light. You can use our tool to locate an HVAC technician near you who can set you up with a UV lamp. If you decide to install one yourself, make sure you understand your service contract and are aware of the possibility that you will void your warranty.

Frequently Asked Questions

Can UV lights damage HVAC system components?

While it’s true that UV light can damage some materials, you don’t have to worry about a UV lamp damaging your HVAC system. The metal used in most HVAC system ductwork is resistant to UV damage and won’t wear down and become brittle over time, like plastic or other composite materials.

Since your germicidal UV light will likely be installed in your air handler, you won’t have to worry about it affecting vulnerable plastic components.

How do UV lights work in HVAC systems?

Ultraviolet lights for HVAC systems work by killing bacteria, microorganisms, and mold to keep the air inside your home clean and safe.

UV radiation has a higher frequency than visible light. The higher frequency UV light has enough energy to destroy the DNA of bacteria and other microorganisms, killing them and sanitizing the air.

What are the benefits of UV lights in air purification?

UV air purifiers are more sanitary and easier to maintain than standard air purification systems. Filter systems are great at filtering dust and allergens out of the air but don’t prevent mold growth.

Filters need to be replaced more often than the bulbs in a UV light system, making them harder to maintain and less effective if you forget to swap out the filter. A dirty filter will also reduce your air conditioning system’s energy efficiency and airflow, which can be a headache.

What does a UV light do for an AC system?

A UV light installed in an AC system serves two main purposes:

  1. Air sanitization: UV-C light can kill airborne microorganisms like bacteria, viruses, and mold spores as the air circulates through the HVAC system. This helps improve indoor air quality by reducing the number of harmful contaminants in the air.
  2. Coil and drain pan sanitization: UV lights can be installed near the evaporator coil and condensate drain pan. These components are prone to moisture buildup, which can lead to mold and bacteria growth. The UV light prevents this growth by sanitizing the coil and drain pan surfaces.

By sanitizing the air and key components, UV lights help keep the AC system clean and free from buildup, improving its efficiency and longevity.

Can UV lights in HVAC systems improve indoor air quality?

Yes, UV lights installed in HVAC systems can significantly improve indoor air quality. The UV-C light emitted by these lamps is effective at killing or inactivating various airborne contaminants, including:

  • Bacteria
  • Viruses
  • Mold spores
  • Fungi
  • Volatile organic compounds (VOCs)

By reducing the levels of these pollutants in the circulating air, UV lights help create a healthier indoor environment. This can be particularly beneficial for people with respiratory issues, allergies, or weakened immune systems who are more susceptible to the effects of poor air quality.

Additionally, UV lights help prevent the growth of mold and bacteria within the HVAC system itself, further contributing to better air quality by removing these contaminants at the source.

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Reviewed for accuracy, cost data, industry best practices, and expert advice by Coty Perry.

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