HVAC and AC mold removal in Lafayette runs $1,500–$6,000 for most work. At 60.5 inches of rain a year on a high water table, with slab-on-grade housing passing vapour upward, the system is carrying a moisture load it was probably never sized for.
Why the equipment is under unusual load here, where growth appears first, and what actually stops it.
Moisture arriving from two directions
Acadiana takes 60.5 inches of precipitation a year, among the wettest metros in the United States, in a subtropical climate where outdoor humidity stays high for most of the year. That alone loads an air conditioner heavily.
What makes it local is the second path. This region sits on a high water table and most of its housing is slab-on-grade, so a major moisture route runs upward — vapour moving through the slab into flooring and skirting. That page covers what it does at floor level; in the air handler it shows up as equipment running against a latent load from below as well as outside.
Where it appears first
The coil and the drain pan, because they are the coldest wet surfaces in the house, and then the plenum and the first few feet of supply duct. A condensate drain that has blocked will do it on its own within a season here, and in a slab house the pan is often the only place the water has to go.
After the August 2016 flooding, flood-related work became recurring rather than exceptional in this region — and a system that was submerged or ran in a wet house is a different assessment again.
The licence Louisiana actually gives you
Louisiana is one of the few states that licenses mould work as its own trade: the state licensing board issues a Mold Remediation classification specific to mould rather than general contracting. In most states a homeowner has no register to check and has to judge a company on its marketing. Here the credential exists, so check it — for us and anyone else.
What does it smell like when it is the AC?
The tell is timing. Why does the smell arrive a few seconds after the system kicks on and fade when it stops? Because the source is inside the equipment or the duct rather than in the room. People describe it as damp towels, a cellar, or occasionally something sharper.
These are the signs you are looking at an equipment problem rather than a room one: allergies worse indoors with the air running than outdoors, dark specks appearing at the supply registers, staining on the ceiling around a vent, water standing around the air handler, and a system that has started short-cycling. Notice two of those together and the equipment is usually the source.
What causes it is almost always one of four things: a blocked condensate drain, a leaking return pulling unconditioned air in, equipment oversized for the house, or humidity the system was never sized to remove. Standing water around the air handler is the one to treat as an emergency rather than a seasonal nuisance — a blocked drain keeps filling, and the damage spreads into the platform and the floor beneath it.
What the work involves
- Document — photographs and moisture readings at the air handler, the coil, the drain pan and along the accessible duct run
- Establish the source — a blocked condensate drain, a leaking return, an oversized system, or humidity the equipment was never sized to remove
- Clear — contaminated insulation and lining out where it is holding moisture
- Treat — antimicrobial application across affected surfaces
- Refer what is not ours — duct sealing, coil replacement and equipment sizing are an HVAC contractor's work, in writing
We clean and remediate. We do not size, service or certify air conditioning equipment, and we will not quote a clean that we can see will not hold while the underlying fault is still there.
Asked about AC mold
Do you clean the ductwork itself?
We remediate contaminated surfaces and remove lining and insulation that is holding moisture. Duct sealing, coil replacement and equipment sizing are an HVAC contractor's work and we refer them in writing rather than quoting around them.
Why does it keep coming back after a clean?
Almost always because the moisture source is still there — a blocked condensate drain, a leaking return, or equipment that satisfies the thermostat before it has removed enough moisture. Cleaning without correcting it is a repeat purchase.
What does it cost?
$1,500–$6,000 for most work, driven by how much of the system and surrounding material is affected. Whole-home remediation runs $6,000–$15,000.
How do I know if it is the AC or the room?
Timing. If the smell tracks the system switching on and off, the source is in the equipment or the duct. If it is constant regardless, look at the room and the building envelope first.
What is the system telling you?
Acadiana adds a twist to the usual AC-mold story: with a high water table pushing vapour up through slab floors, the system is sometimes redistributing moisture the ground supplied.
| Situation | What it means | The local pattern |
|---|---|---|
| Smell arrives on start-up | The source rides the airflow — equipment or duct | Start-up smells here deserve the coil check first — 60 inches a year keeps it wet |
| Smell constant, system off | The room, not the machine — find the moisture source | Constant smell over a slab can be the floor itself — vapour drive, not the machine |
| Dark specks at supply registers | Growth downstream of the coil, usually duct or boot | Specks at registers still mean downstream growth, whatever fed the humidity |
| Water standing at the handler | A blocked condensate line — urgent, not seasonal | At this rainfall, a blocked condensate line backs up faster than almost anywhere |
Louisiana licenses mold remediation as its own trade, and equipment work sits right at the licence line — above $7,500, the classification is required and checkable.
Get a free Lafayette mold inspection
Describe what you have found and, if you can, how high up the wall it is. Growth that starts at the baseboard and works upward points somewhere very different from a stain that starts at the ceiling. That one detail often shortens the whole diagnosis. Expect a reply the same working day.