🔦🚫 Mold Remediation: Why UV Lights Don’t Work

mold in HVAC with reme halo
AC covered in mold with UV light

Mold (Cladosporium & Penicillium/Aspergillus) found in both HVACs with Reme Halo Zero with aFHP-Cell™️ Technology.

Mold Remediation: Why UV Lights Don't Work

Thinking of using a UV light to treat mold in your home or business? 🤔 Think again. UV lights—aka ultraviolet germicidal irradiation (UVGI)—are not an effective mold removal method. In this article, we break down the limitations of UVGI technology and share safer, proven alternatives that eliminate mold 🌱 for good.


⚠️ Limitations of Using UV Light


Mold remediation means removing mold spores from wherever they’re growing—not just sterilizing surfaces. UV lights might sound like a quick fix, but here’s the reality:

  • 🔬 UV can’t reach porous surfaces where moisture and mold linger—like fiberglass ductwork and plenum spaces. Those nooks and crannies are prime for reinfection.
  • What looks clean may still harbor mold—visual inspections and basic air tests often miss hidden contamination.
  • 🌀 UV only works where it's installed. Once air exits the sanitized zone, it hits dirty ducting and the “clean” air… isn't clean anymore.



You can see from the 📊 air quality samples on this page that UV lights are ineffective on treating mold growth. They are great for bacteria and viruses, but time in and time out we see them fail with mold.

mold found in hvac with uv light
uvc lights do not work on mold

Mold (Cladosporium) found in HVAC with APCO-X Fresh-Air UV Light.

✅ Reliable Alternatives That Actually Work


Professional mold remediation uses real tools and proven processes—not gimmicks. Here’s what works:


  • 💨 Air scrubbers remove airborne spores.
  • 💧 Dehumidifiers keep humidity low and unwelcoming to mold.
  • 🚧 Containment zones with negative air pressure push spores out and prevent them from spreading.
  • 🧪 Dry fogging with organic antifungal compounds treats hard-to-reach places—like inside your air handler, plenum, and ductwork.



Mold Masters technicians are trained to use these techniques safely and effectively, minimizing disruption while delivering results that last 🌟.

Mycotoxins in HVAC
black mold not stopped by UV light

A ZERO tolerance mold that produces mycotoxins found in HVAC air Air-Flo UV-C Light System.

What About Prevention?


While all the above measures can certainly help in eliminating existing mold from any space, it's important not to forget about prevention—it's the key element to avoiding unwanted infestations altogether! Prevention lies at the root of all successful mold mitigation strategies. Preventing moisture buildup will limit or eliminate the chances for dangerous fungi forming inside the premises altogether. Remember cool and dry is the secret to a mold free home or business. If it is ever greater than 76° and 60% humidity, mold will grown.


To stop mold spores from getting in to your HVAC we recommend using a MERV 8 to MERV 13 air filter. These filters, filter down to a specific micron to stop most of the nasty things we have kicking around in our air. We also recommend replacing them monthly. Over time they will continue to improve the air quality in your home as they act like your own personal air scrubber!


To keep indoor environments healthy and safe from future outbreaks, maintaining adequate ventilation levels and regularly keeping an eye out for signs of water damage are essential best practices for busy homeowners and business owners alike! You can read more tips and tricks that we share with our clients here to help them have a mold free living.


At Mold Masters, we understand how serious and hazardous mold in your home can be—which is why our professional team provides comprehensive solutions tailored specifically to our client's unique needs! If you're looking for safe and effective solutions regarding your own personal battle against household adversaries such as bacteria and fungi growths… then give us a call today!


For more information, contact us online or call one of our Florida locations: North at 904-397-4030, Central at 813-606-6668, or South at 239-961-9995.


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