★ 4.9 on Google · 150+ Reviews · Best of 2026
Licensed Mold Assessor · Licensed AC Contractor
Serving Greater Orlando, Winter Park, Clermont, Central Florida, the Ocala area and The Villages
Why the Mold Keeps Coming Back
When mold grows inside your air conditioner, the AC itself is creating it. Something in how the system was installed or set up is turning it into a mold breeding machine. The cause is different from one home to the next, but in every case the answer is the same: stop the AC from creating mold in the first place.
That’s the goal. An air conditioner should never breed mold at all. When the cause is corrected and your AC stops creating mold, you won’t need a UV light to fight it. Some homeowners still like having one for the air, and that’s fine. It just won’t be doing a job it was never built to do.
A UV light was never made to stop an AC that’s breeding mold. It’s made to kill a small amount of mold spores passing through the air, like the few that drift in from outdoors. There’s a limit to how much it can kill. When the AC is producing more mold every day than the light can keep up with, the light loses.
It’s like bailing water out of a boat with a hole in the bottom. You can keep bailing, but until someone patches the hole, the boat keeps filling up.
Now look at where the light is. Many UV lights are installed in the supply plenum, the box where the cold air leaves the air handler. That’s after the mold is already growing on the coil, the blower and the cabinet walls. Let’s use some common sense: how does a light that sits after the source stop the source from breeding mold?
A UV light running inside this air handler, with mold growing all around it. The light can’t keep up with a system that’s breeding mold.
A better filter doesn’t fix it either. A filter catches some of what’s in the air going in. It doesn’t change why the inside of the unit stays wet, and dirt still finds its way past the filter and settles right where mold feeds on it.
Dirt that got past the filter, caked onto the blower wheel. That’s what mold feeds on.
⚠️ WARNING: Turn off ALL power before you open anything. The UV bulb must be completely off, not shining, before you look at it. UV light can burn your eyes and skin, even for a few seconds.
1. Turn the AC off at the thermostat.
2. Turn off the power to the air handler at the breaker. This also shuts off the UV light. Make sure the bulb is dark before you open the door.
3. Open the air handler cabinet door and look at the UV bulb. Mold on the bulb or around it? That’s your proof.
4. Look inside the cabinet at the coil, the blower and the walls. If there’s mold in there, your UV light and filter aren’t cutting it.
Don’t scrape or spray it. That sends spores into the air. Not comfortable opening it? Call us and we’ll look with you.
The real cause is in how the system works: how air moves through it, how dirt gets past everything, how water leaves it, and how well it pulls humidity out of your home. Usually it’s more than one thing at once. We know every one of them, and we know how to solve it 100%. We find which ones are happening in your system, correct them, and back it in writing: if the mold comes back within a year anywhere we corrected it, you get your money back.
A UV light treats the air. It doesn’t fix your AC unit. We fix the AC unit.
Have a UV light and still have mold?
Think of it like a good doctor. You don’t just want something for the symptoms; you want to know what’s causing them, so they don’t come back.
Cleaning alone only removes what’s there today. Correcting the cause is what keeps it from coming back.
Ready to stop mold for good?
A real lab report from a home we tested. The lab confirmed mold growing inside the home's ductwork, not just the air handler.
Mold doesn’t always stay in the air handler. Once it’s growing there, your system can blow it into the ductwork, where it settles and grows too. That’s why we check both. Ductwork also plays a role in how mold starts and grows in an AC system in the first place.
Also see high humidity in your house, ductwork repair and replacement and indoor air quality testing.
Mold can only be cleaned off non-porous surfaces like metal. That’s why we can clean the inside of your air handler. Flex duct, duct board and drywall (sometimes used to build return air boxes and AC closets) are porous. Mold grows down into them, not just on top, so it can’t be cleaned out. Whatever is left grows right back and keeps sending spores through your home.
If the lab confirms mold in porous ductwork, that ductwork has to be replaced, not cleaned.
The goal isn’t to keep killing mold. It’s an AC that never creates it. We find why your system is growing mold, whether it’s the design, the equipment, the ductwork or the humidity, and correct it. When nothing grows, there’s nothing to kill.
If your AC is breeding mold, no UV light can stop it. A UV light only kills a limited amount of airborne spores, like ones coming in from outside. We install UV lights for homeowners who want that extra air treatment, but always after the AC has been corrected so it isn’t growing mold in the first place.
Mold can be cleaned from metal surfaces, which is why the inside of an air handler can be treated. We clean the air handler so your system starts fresh, then fix the reason the mold grew, so it doesn’t come back.
Mold grows down into porous duct materials like flex duct and duct board, so they can’t be cleaned. When the lab confirms mold in porous ductwork, we replace it. The new ductwork is designed to work with your AC, because ductwork plays a role in how mold grows.
Want to know what’s in your system first?
Everybody’s body reacts to mold differently. Some people are very sensitive and get sick fast. Others react slowly, over months or years. And many people have symptoms they don’t recognize, like a cough or stuffy nose they’ve lived with so long they think it’s normal.
That’s why it’s common for one family member to feel sick while everyone else says they’re fine. The family starts looking for other causes, and nobody thinks to look at the AC. Just because others in the home aren’t getting sick doesn’t mean the mold is harmless.
Watch Kristen’s Story
If you’ve never lived with clean air coming out of your AC, you may not know how much better you can feel.
Is someone in your home always sick?
Open up the air handlers in homes across Florida, and you’ll find mold in a lot of them. Because it’s so common, many homeowners are told it’s just part of living in Florida.
It isn’t. A correctly installed and correctly running AC system should never grow mold inside the air handler. When it does, something is wrong: with how the system was installed, how it’s sized, how air moves through it, or how moisture leaves it.
If you’ve been told it’s “just Florida” and still felt something wasn’t right, you were right. Once we fix the cause, the mold stops coming back.
Mold is the symptom. The system is the cause.
When you hire us to stop the mold in your AC, solving it is what you’re paying for, and it’s what you get. We take integrity, honor and pride in solving problems, not covering them up.
When you approve the full plan we recommend to correct the cause, we guarantee your mold problem will be solved. Dozens of homeowners we’ve worked with are proof, including the customers in the videos on this page.
The proof is in the results. And we back it up.
Ready for results you can count on?
“It smells musty every time the AC turns on.”
Usually mold and bacteria on the wet parts inside your system, blown into every room.
“I feel better as soon as I leave the house.”
If it eases up when you’re away, look at the air your AC moves through the house.
Moisture is sitting where it shouldn’t. Only a lab test can confirm it’s mold.
“My house feels sticky, even with the AC on.”
Your AC isn’t drying the air, and that extra moisture feeds mold.
“The drain line keeps clogging.”
Slime and mold grow where water collects. Standing water gives mold a permanent home.
If you can see it, it’s already established, and it’s in the air your family breathes.
If you’re noticing any of these, the problem usually won’t fix itself. Every day the system runs, it keeps growing.
Call and tell us what’s going on.
These are the molds that show up most often in lab reports from the AC systems we test, including the real report on this page. Here’s what each one is and how it can affect the people breathing it every day.
What it is: One of the most common molds found indoors. It’s one of the dark, “black mold” types that grows on cold, wet coils, vents and duct surfaces.
Common symptoms: Sneezing, stuffy or runny nose, itchy or watery eyes, coughing, wheezing and skin irritation.
Long-term concerns: It’s one of the top mold triggers for allergies and asthma. Breathing it every day can keep symptoms going all year and make asthma harder to control.
What it is: A very common mold with many species. Its spores are tiny enough to travel deep into the lungs.
Common symptoms: Coughing, wheezing, shortness of breath, chest tightness and congestion.
Long-term concerns: It can make asthma worse, and it can irritate the lungs in sensitive people. People with asthma, other lung conditions or a weakened immune system are more sensitive to it and should talk to their doctor.
What it is: The same family of mold penicillin comes from. Growing in your AC, it’s a different story: it spreads fast in damp spots and travels easily through the air.
Common symptoms: Sneezing, congestion, coughing, itchy eyes, sinus irritation and asthma flare-ups.
Long-term concerns: Breathing it over and over can keep allergy and asthma symptoms going and irritate the sinuses and lungs in sensitive people.
What it is: A dark mold that grows on damp surfaces and often shows up alongside other molds in AC systems and ductwork.
Common symptoms: Stuffy nose, sinus pressure, sneezing, coughing and wheezing.
Long-term concerns: A known trigger for allergies and asthma, and it can irritate the sinuses in sensitive people. People with a weakened immune system should be especially careful around it.
Who’s at higher risk: Babies and children, older adults, anyone with asthma, allergies or COPD, and anyone with a weakened immune system.
This is general information, not medical advice. If someone in your home has symptoms, talk to your doctor and tell them mold was found in your AC.
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Most homeowners have to call one company about their AC and a different one about mold. We understand both.
Because we understand both the mold and the machine that’s growing it, we can do what a mold-only company or an AC-only company can’t do alone: stop the growth at the source.
It’s common, but it’s not normal. A correctly installed and correctly running system should not grow mold inside the air handler. When it does, something in the system needs to be corrected.
No. A UV light can help with some spores in the air, but it doesn’t stop a system that isn’t set up correctly from growing mold. We often lab-test systems with UV lights and still find mold.
Cleaning removes what’s there today. If the cause isn’t corrected, the mold comes back. Prevention means cleaning it and fixing why it grew.
Not always. Many systems can be corrected. If replacement truly makes more sense, we’ll tell you why and show you the numbers.
Yes. When you approve the full plan we recommend, we guarantee your mold problem will be solved. If mold comes back within one year anywhere we corrected or replaced it, in the air handler or the ductwork, you get your money back for the correction work. Lab testing and inspection fees aren’t included. Your part is keeping the system properly maintained and following the mold prevention maintenance we lay out for your home. Every guarantee is given in writing.
Greater Orlando, Winter Park, Clermont, Central Florida, the Ocala area and The Villages.
FL HVAC Services serves homeowners across Central Florida, including:
Your air conditioner should make your home cleaner and drier, not the opposite. Call 352-358-5537 and we’ll find out why yours is growing mold and fix it at the source.
Tell us what you’re noticing and how you’d like us to reach you: call, text or email.
