When we consider indoor air quality, we often focus on common pollutants such as dust, pollen, and pet dander. While air filters do a good job of trapping these larger particles, they can’t eliminate bacteria, viruses, and mold spores that may be circulating throughout your HVAC system. That’s where UV (ultraviolet) light technology comes in.
UV lights have been used for decades in hospitals, labs, and commercial HVAC systems to disinfect air and surfaces. Now, homeowners are adopting UV light solutions to create cleaner, healthier indoor environments—especially in areas like Middle Tennessee, where humidity and allergens are common year-round.
So, what exactly do UV lights do for your HVAC system, and how can they improve your indoor air quality? Let’s explore the science behind UV lights, how they work in HVAC systems, and why they’re a smart investment in your family’s health and comfort.
What Are UV Lights and How Do They Work?
UV (ultraviolet) light is a form of electromagnetic radiation that’s invisible to the human eye. It’s divided into three types: UVA, UVB, and UVC. UVC light is the most powerful and is commonly used for disinfection purposes.
When installed in an HVAC system, UV-C lights emit a specific wavelength (typically around 254 nanometers) that breaks down the DNA or RNA of microorganisms, rendering them inactive and unable to reproduce. In short, UV light kills or neutralizes bacteria, viruses, mold, and other pathogens that can negatively impact your indoor air.
Where Are UV Lights Installed in HVAC Systems?
There are two common types of HVAC UV light installations:
1. Coil Sterilization (Coil UV Lights)
These are installed near the evaporator coil, which is a prime location for mold and bacterial growth due to moisture accumulation. The UV light shines continuously on the coil to keep it free from microbial buildup.
2. Air Sterilization (In-Duct UV Lights)
These are placed inside the return air duct and operate only when the system is running. They sanitize moving air as it passes through the ductwork, effectively treating the air before it enters your living space.
Both types can be used together for maximum air quality improvement.
Benefits of UV Lights for Indoor Air Quality
✅ 1. Kills Bacteria and Viruses
One of the most powerful benefits of UV lights is their ability to kill airborne pathogens. This is especially important for households with:
Children
Elderly family members
People with asthma or immune conditions
UV lights are proven to neutralize viruses, including influenza, and certain bacteria that cause colds and respiratory illnesses.
✅ 2. Prevents Mold and Mildew Growth
Mold thrives in dark, damp places—like your HVAC system’s coil or drain pan. Once it grows, it releases spores that circulate through your home and trigger allergic reactions or respiratory issues.
UV lights prevent mold from forming on your coils and other damp components, helping to eliminate this source of contamination entirely.
✅ 3. Improves System Efficiency
When your evaporator coil is coated with microbial buildup or mold, airflow is restricted, and your system must work harder to heat or cool your home. UV lights keep your coil cleaner for longer, improving:
Airflow
Cooling efficiency
Energy consumption
That means lower utility bills and reduced wear on your HVAC equipment.
✅ 4. Reduces Unpleasant Odors
Mold, bacteria, and VOCs (volatile organic compounds) in your HVAC system can produce stale, musty, or chemical odors. By breaking down these organic contaminants at the source, UV lights can significantly reduce bad smells in your home.
✅ 5. Enhances Air Quality for Allergy Sufferers
If you or a loved one suffers from allergies, UV lights can make a world of difference. They neutralize mold spores, bacteria, and other airborne irritants that traditional filters can’t catch, reducing symptoms like:
Sneezing
Coughing
Itchy eyes
Headaches
Sinus congestion
UV purification is a powerful complement to HEPA filters and dehumidifiers for creating a healthier indoor space.
Are UV Lights Safe?
Yes—when installed professionally, UV lights are safe for use in HVAC systems. They’re enclosed inside your unit or ductwork and do not expose residents to UV radiation.
It’s important to note that UV bulbs lose effectiveness over time (usually around 9,000 hours or 1 year), so they should be replaced annually to maintain performance.
Do You Still Need Air Filters with UV Lights?
Absolutely. UV lights are not a replacement for air filters—they work best in conjunction with high-efficiency filtration. While UV lights neutralize microbial contaminants, they don’t remove dust, pollen, or pet dander from the air.
For optimal indoor air quality, combine:
UV lights
MERV 8–13 air filters
Routine maintenance
Humidity control
Together, these systems create a comprehensive air purification strategy.
How Much Do UV Lights for HVAC Systems Cost?
Prices vary depending on system type, model, and installation needs, but the average cost for UV light installation ranges from $400 to $1,000.
While this may seem like a sizable investment, the return in terms of:
Improved health
Reduced illnesses
Extended HVAC lifespan
Lower energy bills
makes it well worth the cost—especially for households with health sensitivities.
Why Choose South Nashville Heating & Cooling for UV Light Installation?
At South Nashville Heating & Cooling, we specialize in indoor air quality solutions tailored to your home and your family’s needs. When you schedule a consultation with us, we’ll assess your HVAC system, explain the best UV light placement options, and handle professional installation with safety and care.
Our technicians are trained in the latest IAQ (indoor air quality) technologies and can recommend a full solution that may include:
UV lights
HEPA filters
Whole-home humidifiers or dehumidifiers
Duct cleaning
Air quality testing
Ready for Cleaner, Healthier Air?
If you’re looking to reduce airborne germs, control mold, and improve your family’s health, UV light technology is a smart and powerful solution.
👉 Fill out the form below to schedule a free indoor air quality consultation or UV light installation with South Nashville Heating & Cooling. Let us help you breathe easier with a healthier, safer home environment.
