The musty smell when the AC starts is usually the plenum or the coil. We find it, photograph it and fix it, and tell you straight when a licensed remediator is needed instead.
Or call +1 (737) 299 19 19for free inspection
The musty smell when the AC starts is usually the plenum or the coil. We find it, photograph it and fix it, and tell you straight when a licensed remediator is needed instead.
If your system smells stronger during cooling cycles, contamination inside the air handler or duct lines may be present.
Every project begins with a free professional inspection. The final scope depends on the home, existing system, and requirements.
9 steps, each one photographed, from supply registers & vents to duct connections, sealing & support. See exactly what we check, what can go wrong and what we photograph before you book.
Taken by the crew on site. Nothing staged, nothing from stock. 8 photos.
See examples of microbial growth in air ducts work completed for homeowners across Central Texas.
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BeforeAfterRead what local homeowners say about their experience with Air Duct Busters.
They came to do the full inspection of our HVAC system and performed a thorough inspection with photos and a very detailed list of quoted recommendations. Gary and team were punctual the 3 times they came to our home and their price was very reasonable.
Read on GoogleNoah took the time to show us photos from inside the vents and ductwork and clearly explained the level of cleaning needed and why. We really appreciated the transparency and education instead of feeling pressured.
Read on GoogleGary inspected the plenum, there was microbial growth in the insulation. The system was replaced 3 years ago but had the original 20 year old plenum. Gary replaced the plenum and installed a scrubber. We haven't had any allergy problems in our new home so far.
Read on GoogleNoah was professional, knowledgeable, and extremely thorough while working on both my air ducts and chimney. He took the time to explain everything and made sure the work was done properly from start to finish.
Read on GoogleAir Duct Busters provides microbial growth in air ducts for homeowners throughout Central Texas, including Marble Falls and surrounding communities.
Short reads from the crew: what we find in Hill Country homes, what it costs, and what to do about it.
HVAC companies replace the unit and leave the return plenum. Twenty years of damp insulation then feeds the brand-new system. What a plenum is, how to check yours, and what replacement involves.
September 7, 2026 · 3 min read
From our job log in Spicewood: 6 recent visits for dryer vent, ductwork, HVAC. Photos from the crew, work as written on the invoice.
September 7, 2026 · 3 min read
From our job log in Marble Falls: 8 recent visits for dryer vent, ductwork, microbial growth and air quality. Photos from the crew, work as written on the invoice.
September 7, 2026 · 4 min read
Yes. Microbial growth can form inside air ducts when moisture combines with dust and organic debris. High humidity, condensation, roof leaks, or past water damage can create the conditions needed for microbial growth inside HVAC systems. If moisture is not addressed, microbial spores can circulate throughout the home every time the system runs.
Common signs include: Musty odor when the AC turns on Dark spotting around vents Increased allergy or respiratory symptoms Visible moisture inside vents History of recent water damage A professional inspection is the most reliable way to determine if contamination is present inside accessible ductwork.
Microbial growth exposure can aggravate asthma, allergies, sinus irritation, and other respiratory issues. While not all types of microbial growth are harmful, continuous circulation of contaminated air can reduce indoor air quality and affect comfort inside the home. Routine inspection and cleaning helps minimize airborne contaminants.
Professional duct cleaning can remove surface contamination and debris inside accessible ductwork. When appropriate, antimicrobial treatment may be applied to reduce microbial growth. However, if contamination is extensive or embedded in structural materials, licensed microbial growth remediation may be required under Texas regulations.
How can I prevent microbial growth from forming in my HVAC system? You can reduce microbial growth risk by: Maintaining indoor humidity between 30–50% Changing air filters regularly Scheduling annual HVAC maintenance Addressing water leaks quickly Cleaning ducts periodically Homes in Central Texas with high humidity or previous water damage should schedule HVAC inspections to prevent future microbial growth.
You can reduce microbial growth risk by: Maintaining indoor humidity between 30–50% Changing air filters regularly Scheduling annual HVAC maintenance Addressing water leaks quickly Cleaning ducts periodically Homes in Central Texas with high humidity or previous water damage should schedule HVAC inspections to prevent future microbial growth.
Start with a free professional inspection. We look, photograph, and put the price in writing before any work.
+1 (737) 299 19 19