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How To Prevent Mold in Your HVAC System During Florida’s Humid August

August 28, 2024
How To Prevent Mold in Your HVAC System During Florida’s Humid August

Florida locals know that the state is notorious for its hot, humid climate with August being one of the least comfortable months. Controlling indoor humidity during the summer can be tricky, leading to excessive mold growth inside your air conditioner if you’re not careful.

Mold spores are everywhere, yet we at Southern Air Heating & Cooling know how to keep their levels in check. Read our guide below to learn how to prevent mold in your HVAC system and ensure great indoor air quality all summer.

The Problem With Mold

Mold often grows in air conditioners in the summer due to temperature variations. When warm air meets cold air, condensation occurs. That moisture creates an ideal environment for mold spores to settle and form colonies.

Though mold spores are always present even in HVAC systems, an overgrowth can cause serious problems. Inhaling spores can trigger allergies, respiratory problems, and other health issues. Mold growth can also create a lingering musty odor and ruin your property’s building materials and personal belongings.

Warning Signs of Mold In Your Florida Home

Sometimes mold colonies can develop inside cooling systems before anybody notices a problem. Yet, if you know what signs to look for, you can take immediate action to prevent major problems like poor indoor air quality, health problems, and property damage.

If you notice one or more of these warning signs, your air conditioner might have a mold problem:

  • An unidentifiable musty odor whenever the air conditioner runs
  • Excessive condensation around the HVAC unit
  • High energy bills without an obvious cause
  • Visible black or green specks or fuzzy patches of mold around the air conditioner or vents
  • Allergy-like symptoms any time the air conditioner is on

Tips for Preventing Excessive Mold Growth in Your Air Conditioner

Poor HVAC performance can lead to mold. Learn how to prevent mold in your HVAC system with these tips:

  • Get Professional HVAC Maintenance Services. Regular inspections in the spring by an experienced technician can uncover leaks and other problems that encourage mold growth.
  • Change the Air Filter. Typically, you should change or clean your air filter every three months. Still, it’s better to do it every 30 days to avoid airflow restriction and moisture buildup.
  • Adjust the Thermostat. It’s best not to let your air conditioner run continuously. Adjust the thermostat between 72 and 78 degrees with the “auto” function on to let the system cycle on and off to control humidity.
  • Install a Dehumidifier. If your Florida home is too humid, invest in a dehumidifier to make indoor moisture levels more reasonable.

Reach Out to Southern Air Heating & Cooling for More Help

We know how to prevent mold in your HVAC system through routine maintenance and expert repairs at Southern Air Heating & Cooling. Our licensed crew has decades of experience serving Palatka, Florida, and the surrounding communities. We consistently deliver comprehensive cooling and heating services with red-carpet customer support.

Let us help prevent mold buildup in your air conditioner despite Florida’s humid summers — call (386) 222-1342 today for service. Learn more now.

Frequently Asked Questions

What causes mold in HVAC systems?

Mold in HVAC systems is typically caused by excessive moisture and humidity, which can accumulate in ductwork and around cooling coils.

How can I tell if there is mold in my HVAC system?

Signs of mold in your HVAC system include musty odors, visible mold growth around vents, and unexplained respiratory issues in the home.

What are the health risks associated with mold exposure?

Health risks can include allergies, respiratory issues, and other health problems, particularly for individuals with pre-existing conditions.

How often should I clean my HVAC system to prevent mold?

It is recommended to clean your HVAC system at least once a year, or more frequently if you live in a humid environment.

Can I prevent mold with a dehumidifier?

Yes, using a dehumidifier can help lower humidity levels and reduce the likelihood of mold growth in your HVAC system.

What should I do if I find mold in my HVAC system? 

If you find mold, it is advisable to contact a professional HVAC technician to assess and remediate the issue. 

Meet Dustin

Dustin Caison serves as both the President and CEO of Southern Air, a family-owned business founded in 1980 and based in Palatka, Florida. As the third generation to lead the company, Dustin has dedicated over 21 years to continuing the legacy of excellence established by his father and grandfather.

A State Certified Air Conditioning Contractor, Dustin brings extensive expertise and professionalism to the HVAC industry. Under his leadership, Southern Air has maintained its commitment to delivering quality service and fostering strong ties with the Palatka community. His dedication and credentials have been key to the company’s ongoing success.

An avid outdoorsman, Dustin enjoys hunting, fishing, and golfing with his family and friends. He is also deeply involved in his local community, serving at his church, Rodeheaver Boys Ranch, the Putnam County Fair Board, and A Women’s Resource Center.

Dustin places great importance on taking care of his people and building strong relationships with his employees. He believes that with a dedicated team, strong business practices, and a focus on continuous growth, any business can achieve remarkable success.

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Suzan C.
1 day ago
Albert was fantastic! He arrived in a timely manner and quickly solved our problem. I will definitely recommend Albert and Southern Air, and will continue to use Southern Air for my annual maintenance.
Response from the owner:Thank you so much for taking the time to leave us a 5 star review!
Marshall B.
2 days ago
My technician was great. He had been to our house before and knew where to go quickly and cleanly. I plan to renew .y semi annual service program. When it is due in 6 months.
Response from the owner:Thank you, Marshall, for taking the time to share your feedback. We’re glad your technician made the return visit smooth and kept everything neat, and we pride ourselves on professionalism. Please call us anytime to schedule your next seasonal tune-up or to set up ongoing service when your semi-annual plan is due.
Lacey F.
5 days ago
Absolutely loved our service technician! He was super friendly and took care of our issues in record time!!!!
Response from the owner:Thank you, Lacey, for your feedback and for sharing your experience with Southern Air. We’re glad our technician was courteous and resolved your HVAC concerns quickly, and we take pride in our fast response. If you ever need seasonal tune-ups or want to set up ongoing service, please give us a call.
Nana A.
5 days ago
Lake was very knowledgeable and efficient. I would recommend this employee.
Response from the owner:Thank you for your review! We know how important it is to have issues resolved quickly, and we’re glad Robert was able to take care of the drain problem promptly and professionally. We appreciate you trusting Southern Air!
TopangaK9
5 days ago
Technician Justin Coates went above and beyond servicing my two AC units. I'm in Florida, one of the units is in the attic, poor guy. He was professional, knowledgeable and VERY thorough. I also like that Southern Air reminds me when service is due. Update: today 9/15/2026, "Jamar Witt" came out, determined that the duct in the ATTIC had collapsed and replaced it. NOT an easy task in a 100+° attic in a limited space! He also replaced a weak capacitor that was still under warranty. Knowledgeable, professional, and personable. Highly recommend Southern Air. 🌟 🌟 🌟 🌟 🌟
Response from the owner:Thank you so much for your 5 Star review TopangaK9!
cathy D.
5 days ago
He was courteous and friendly. And prompt!!! He has always been professional and helpful . Thank you so much Justin. 😊
Response from the owner:Hi Cathy! Thank you so much for taking the time to leave us a positive rating!
Anna D.
5 days ago
Trenton was polite, professional and took the time to explain the thermostat settings and how to adjust humidity control Very satisfied with results.
Response from the owner:Thank you, Anna, for taking the time to share your feedback. We’re glad you received quick, courteous, professional service and that our team answered your questions clearly, since fast response is a point of pride for us. Please call us anytime to schedule seasonal tune-ups or set up ongoing maintenance service.
bert S.
6 days ago
Albert is a very nice pleasant person. Has shown great customer service
Response from the owner:Thank you for trusting us and for taking the time to share your experience! We’re proud to have Robert on our team and glad he could take great care of you.
Linda G.
6 days ago
Albert was very polite and professional. He fixed our mini split issue effectively and was pleasant to work with.
Response from the owner:Thank you, Linda, for sharing your feedback. We’re glad Albert’s professionalism and courteous approach helped resolve your mini split issue quickly and effectively. We’re known for fast response and would love for you to call us anytime to schedule seasonal tune-ups or set up ongoing service.
Chris M.
6 days ago
Very polite very honest way better than any company I ever had out and I set up a service plan very good
Response from the owner:Chris, thank you for the kind words—I'm glad our team came across as polite and honest and that the service felt better than what you’ve experienced before. We really appreciate you setting up a service plan with Southern Air, and we’ll work hard to keep earning your trust.
Rachel S.
6 days ago
Dylan with Southern Air is extremely friendly, professional, courteous, and down to earth. He was extremely down to earth and great at explaining things. Hope to have him again! He did an absolutely amazing job!
Response from the owner:Thank you, Rachel, for your feedback and for highlighting Dylan’s friendly, professional service and the clear way he explained everything. We take pride in our professionalism and fast response, and we’re glad you had such a positive experience. If you’d like to schedule a seasonal tune-up or set up ongoing service, please give us a call anytime.
Roni H.
6 days ago
Our technician, Albert, turned what could have been a profitable moment for his company, but not a good choice for us, in regard to fixing a mini split, into a moment if integrity. I appreciated his candidness especially in light of other AC companies trying to upsell to us. Thank you, Albert and Southern Air!
Response from the owner:Thank you, Roni, for taking the time to share your feedback. We’re glad Albert provided honest guidance on your mini split and helped you make the right choice, and we’re proud of our professionalism. Please call us anytime for seasonal tune-ups or to set up ongoing HVAC service.
janis H.
6 days ago
Trenton was amazing, thoughtful, kind and extremely professional.
Response from the owner:Thank you, Janis, for taking the time to share your feedback. We’re glad you had a great experience and that our team delivered the professionalism and care you deserved, along with our fast response. Please feel free to call us anytime for seasonal tune-ups or to set up ongoing service.
Tony P.
1 week ago
After a great visit from Jeremy with Souther Air, we pursues a GREAT Air condition unit. Steve and Mat came out and put it right in. Their service was excellent and had it up and running and took our old one away!! We will be customers for at least 25 yrs. Thank you Southern Air for making us feel so at ease for such a big purchase. 😊
Response from the owner:Thank you so much for choosing Southern Air Tony!! We are proud of our Team Shield and always strive to supply your comfort needs with Southern hospitality. We appreciate the opportunity to serve YOU!!
Margaret M.
1 week ago
Southern Air is a first-class company. We have employed their HVAC services for many years. And I am very pleased with HVAC expert Damon. He is a very knowledgeable, professional, and skilled young man. He keeps me well-informed of any issues with my system. I also commend Southern Air’s office manager and staff. They are excellent communicators. On October 10, 2025, Technician Robert Wright was here to add a compressor starter kit when my unit was not cooling properly. He came out at night, added the kit, and cleaned and flushed the lines. He did an excellent job. Technician Damon is here again this morning to do periodic maintenance. Southern Air and their Technicians are professional, excellent, and timely. Southern Air even texts me when the Technicians are coming and includes their pictures. Their office staff are friendly and efficient. A live person always answers the phone. I highly recommend Southern Air for your HVAC needs. On September 11, 2026, Technician Justin Coates installed a new Honeywell thermostat. He did an excellent job, as usual. Southern Air is an excellent company.
Response from the owner:Thank you for your continued trust! We’re thrilled Damon and our team have consistently provided knowledgeable and professional service. We truly appreciate having you as a loyal customer!
Deborah R.
1 week ago
Prompt excellent service by a very pleasant tech who solved the issue in good time and had everything he needed to do the repairs.
Response from the owner:Thank you, Deborah, for your feedback and for noting the prompt, friendly service and quick repair. We take pride in our fast response and making sure our technicians arrive prepared to resolve issues efficiently. Please call us anytime for seasonal tune-ups or to set up ongoing HVAC service.
Daniel M.
1 week ago
Awesome thank you 😊
Response from the owner:Thank you for the awesome review! We appreciate your support and are always happy to help.
Author David D H.
1 week ago
We just got the maintenance plan and Justin came out again, he's honest and truthful, and comitted, does a great job with both our units. Thanks Justin,
Response from the owner:Thank you for your review! I'm glad we could help get your AC running despite the challenges with your older unit. If you need any further assistance, feel free to reach out.
Susan D W.
2 weeks ago
Dylan showed up quickly after my requesting service, within 90 minutes he was here. He was friendly, knowledgeable and very detailed in his services. He knew exactly what my problem was, and told me about some other issues I have and offered me a maintenance plan which ultimately lowered my bill for services. Kudos to Dylan Pacetti, we are very thankful for your time and attention. Had a second visit today 09/09/26 with Dyaln Pacetti and Southern Air. Want to give a huge shout out to Dylan Pacetti at Southern Air... He is a great technician, very knowledgeable, polite and does excellent work. Southern Air is a great company if you need service with your heating or air. Great customer service, Robert, the service manager and everyone in the office are fantastic, quick callbacks and even same or next day service on most calls. The prices are very good, and they have an excellent maintenance plan, very affordable. If you need any kind of air or heat services, give them a call.
Response from the owner:Thank you, Susan, for taking the time to share your feedback. We’re glad our fast response and professionalism made the visit smooth, and that Dylan was able to pinpoint the issue, walk you through the findings, and help reduce your overall cost with a maintenance option. If you’d like, please call us anytime to schedule seasonal tune-ups or set up ongoing service.
Brenda F.
2 weeks ago
Lake serviced our unit today for the first time. It was last serviced in January. He spent about 1.5 hrs and was very thorough. He said everything was good for another 6 months. Thank you!😊
Response from the owner:Thanks so much Brenda. Joel's friendly personality is contagious!! We appreciate you and thank you for choosing Southern Air!!
Audrey B.
2 weeks ago
Prompt, courteous, job tidiness and friendly attitude. A person who has pride in his work and job. So refreshing. Thanks Justin.
Response from the owner:Hi Audrey! We appreciate the review and are glad we could be of service!
Bobby S.
2 weeks ago
Service was very good and thorough. I needed a filter but Albert didn't have one. He advised that he would bring one back.
Response from the owner:Bobby, thank you for the 5-star rating and for choosing Southern Air for your HVAC needs. We really appreciate your support and the chance to help out.
Anna W.
2 weeks ago
Our unit went out on holiday weekend they came Sunday to try to fix realized unit was blown it was 20 years old. Since ours was completely out bumped putting whole brand new system on our house came out Monday to decide what would work by Tuesday our house was nice and cool again and could not even tell old unit was there or anyone was in the yard. So pleasant and professional 10 out of 10 recommend
Response from the owner:Thank you, Anna, for your feedback and for recommending Southern Air. We’re glad we could respond quickly over the holiday weekend, help you choose the right replacement, and have your home cool again by Tuesday, all while keeping the work neat and professional. Please call us anytime to schedule seasonal tune-ups or set up ongoing service to keep your system running smoothly year-round.
Linda L.
2 weeks ago
Customer support and service excellent.
Response from the owner:Thank you, Linda, for the 5-star rating and for taking the time to share your support. We pride ourselves on professionalism in every visit, and we’re glad you chose Southern Air. If you ever need a seasonal tune-up or would like to set up ongoing service, please give us a call.
Sheila S.
2 weeks ago
Thank you Damare for resolving our issue so quickly!! My house is nice and cool!
Response from the owner:Thank you, Sheila, for taking the time to share your feedback. We’re glad our fast response helped get your system back on track so your home is comfortable again. Please call us anytime for seasonal tune-ups or to set up ongoing service.

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