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PROJECT SPOTLIGHT

Mold Sanitizing After an AC Leak in Frisco

A two-story Frisco home hit with a sour, musty odor after its AC condensate drain clogged and overflowed into the ductwork. We treated the problem at its source rather than masking it, and verified clean, dry duct surfaces afterward.
Mold inside an HVAC plenum before cleaning in Dallas, TX

SERVICE

Air Duct Sanitizing

LOCATION

Frisco

DURATION

One visit

PROPERTY

Two-story

How the job went

Every project, the same way: look, show, fix, prove.

01

The call

During a summer heatwave, an algae-clogged condensate line let the drain pan overflow into the dark insulation of the main supply plenum. Even after a plumber cleared the drain, the warm, damp conditions inside the ducts bred rapid biological growth, and a stale dirty-sock smell spread through the house whenever the AC ran.

02

What the camera found

When water soaks a fiberglass-lined plenum or pools in the low spots of flexible duct, airflow alone will not dry it out. The damp dust layer becomes food for mold and mildew, and the system starts pushing microscopic spores and odors into the air the family breathes.

03

The work

We used thermal imaging and a duct camera to pinpoint where moisture had pooled and how far the growth had spread. Our crew removed the wet, contaminated fiberglass from the plenum and replaced it with clean, moisture-resistant closed-cell lining, then cleared the organic film from the main lines with low-pressure extraction and non-abrasive wipers. We deep-cleaned the evaporator coil with a self-rinsing cleaner, then fogged an EPA-registered, plant-based antimicrobial through the whole duct network on the low fan setting so it reached every bend and neutralized spores without leaving harsh residue.

04

The result

The musty odor was eliminated at its source instead of covered up, a follow-up camera pass confirmed clean and dry duct surfaces throughout, and the underlying growth risk was resolved, giving the family fresh, healthy indoor air.

Before & after

Heavy mold inside an HVAC air handler before cleaning in Dallas, TX
Before
HVAC plenum box interior after professional cleaning in Dallas, TX
After
Heavy mold around an air vent register before sanitizing in Dallas, TX
Before
Supply air vent opening cleaned and sanitized in Dallas, TX
After
Before
After

From the job

More photos, click to enlarge.

Rated 5 out of 5

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Questions about this job

What homeowners ask when they see a project like this one , answered straight.

What causes that musty, dirty-sock smell from the vents?

It is usually biological growth inside the ducts or on the coil, often after moisture gets in. The system then pushes the odor through the house every time it runs.

Water in the plenum soaks the insulation and dust, which becomes food for mold and mildew. Airflow alone will not dry it out, so it keeps producing odor.

We treat it at the source. We remove the wet lining, clean the coil, and fog an antimicrobial through the system, so the odor is gone rather than masked.

Yes. We use an EPA-registered, plant-based antimicrobial that treats the surfaces without leaving harsh chemical residue.

We run a camera back through afterward to confirm clean, dry duct surfaces, and you see that verification for yourself.