HVAC and Duct Mold Remediation in Biloxi, MS
The thermostat clicks, the blower starts, and for a minute the whole house smells like a wet towel. Or there is a dark ring around the supply register in the bedroom that comes back after you wipe it. Biloxi runs the air conditioning from March into November, and every one of those days the system pulls humid Gulf air across a cold coil inside a hot attic. Call and describe what you smell. We handle HVAC and duct mold in Biloxi, D’Iberville, and the eastern Mississippi Gulf Coast.
Why the system is where it starts
Condensation near the cooling coil is what EPA calls a major factor in moisture contamination of duct systems. The coil sweats, the drain pan overflows or the line clogs, water sits in the plenum, and insulated flex duct running through a 130-degree attic sweats on the outside and holds moisture on the inside. Registers drop below the room’s dew point and drip on humid days. Then the blower carries whatever grew to every room. EPA says not to run a system you suspect is contaminated, because it can spread mold throughout the building.
What the smell at the vents is telling you
- Some mold starts out of sight — a coil or a plenum you never look at can carry growth for a season before anything shows at a register.
- Smell it every time the AC kicks on? That musty smell has a source, and the system is pulling air across it.
- “I can’t see anything” doesn’t end the question when the smell arrives with the airflow.
- Wet or moldy insulated flex duct can’t be cleaned; it gets replaced.
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What the work looks like
The system goes off. The air handler and the affected duct runs get isolated and put under negative pressure. Hard metal duct, the plenum, and the housing get cleaned in place and HEPA-vacuumed. Insulated flex duct that is wet or moldy comes out and is replaced. Registers that have been growing come off and get cleaned or replaced. Then we tell you what has to change — the drain line, the pan, the attic insulation around the duct — so the new duct doesn’t sweat the way the old one did.
Biloxi notes
Most of the housing here runs ducts through the attic, and a Biloxi attic in July is the warmest, dampest place in the house. The tight new construction in D’Iberville and Woolmarket keeps conditioned air in, which is good, and keeps duct moisture in, which isn’t. The 1960s and 70s slab houses in West Biloxi and North Biloxi often have the air handler in a hall closet with the drain running somewhere nobody has looked in years. If the smell rides the airflow, start with a call.
