Mold & Mildew Duct Treatment in St. Augustine, FL

If you smell a musty 'dirty sock' odor when the AC kicks on, see black specks around your supply vents, or notice unexplained allergy flare-ups — there's a strong chance mold is growing inside your Florida ductwork. Our antimicrobial duct treatment uses EPA-registered fog to kill mold spores at the source, then we sanitize the entire HVAC system so it stops recirculating spores into every room.

Bastion Duct Solutions provides air duct and dryer vent cleaning to homeowners across St. Augustine and all of St. Johns County — from historic downtown and Lincolnville to Nocatee, SilverLeaf, World Golf Village, Ponte Vedra, and St. Augustine Beach. Coastal salt air, 75%+ summer humidity, and constant AC runtime turn dust into a sticky biofilm inside St. Augustine ductwork in as little as 18 months. We use truck-mounted negative-air HEPA vacuums and NADCA-style agitation on every job, with optional EPA-registered antimicrobial fog treatment to kill mold spores left behind by Florida humidity.

Why St. Augustine homes need this service

• Salt-air corrosion and mold in St. Augustine Beach and Vilano Beach coastal homes
• Original ductwork in historic downtown St. Augustine and Lincolnville homes
• Post-construction drywall dust in Nocatee, SilverLeaf, and World Golf Village new builds
• Multi-zone HVAC systems in Ponte Vedra Beach and Sawgrass estate homes

What's included

• Kills mold and mildew spores throughout the entire HVAC system
• Eliminates musty 'dirty sock' AC smells at the source
• EPA-registered, family- and pet-safe formula
• Significantly reduces allergy and respiratory irritation
• Pairs with full air duct cleaning for maximum effect

Our process in St. Augustine

1. Inspect for Mold: Camera inspection of the supply runs, evaporator coil, and return plenum to confirm what we're dealing with.
2. Deep Clean First: Mold treatment is only effective on clean surfaces — we always recommend pairing with full duct cleaning.
3. Antimicrobial Fog: EPA-registered antimicrobial introduced as a fine fog while the blower runs, coating every interior surface.
4. Dwell & Ventilate: 30-minute dwell time, then we ventilate the home before handing it back to you.

Mold & Mildew Duct Treatment FAQs — St. Augustine

Is the antimicrobial fog safe for kids and pets?

Yes — we use EPA-registered formulas approved for occupied spaces. We still ventilate the home after treatment and ask you to wait 30 minutes before re-entering.

Will this fix a major mold problem in my AC?

Surface mold in the ducts, yes. If mold is growing on the evaporator coil itself or there's water damage in the air handler, we'll flag it and recommend HVAC service first.

How long does the treatment last?

St. Augustine humidity means spores can return — most homes benefit from re-treatment every 2–3 years alongside their regular duct cleaning.

Do I need a mold test first?

Not for surface treatment. If you suspect a structural mold problem, hire a licensed mold assessor before any cleaning.