Musty Smell, Dust or Sticky Air: Who Should You Call?

Quick answer: Stop any water first: a plumber handles leaks and sewer smells, a roofer handles roof leaks. Call an HVAC company for humidity, weak airflow, dust, AC drain lines and ducts. In Texas, a licensed mold assessor tests for mold and a separate licensed remediation company removes it.

Who should you call first for an indoor air problem?

Start with the cause, not the smell. A musty odor, a film of dust or air that feels sticky can come from very different places, and calling the wrong trade first often means paying for a visit that ends with “you need someone else.” If water is involved, the water comes first. No filter, fan or cleaning can keep up with an active leak.

Here’s the short version:

• Water dripping, a leaking water heater or a sewer smell: plumber
• Ceiling stain that grows after it rains: roofer
• Sticky air, dust, weak airflow, AC leaking water or a musty smell when the AC starts: HVAC company
• You want to know if there’s mold and how much: licensed mold assessor
• Mold needs to be removed: licensed mold remediation company
• Questions about how the air might affect someone’s health: a doctor

When should you call an HVAC company?

For humidity, dust, airflow and AC water, which covers more than you’d think in Central Texas. A long, humid cooling season works your system hard, and when something is off, you feel it in the air. Call an HVAC company when you notice:

• Rooms that feel clammy even with the AC running, or indoor humidity that stays above about 55-60%
• Dust coming back within days of cleaning
• Weak airflow from some vents, or rooms that never get comfortable
• A musty or dirty-sock smell when the AC first kicks on
• Water around the indoor unit, a full drain pan or a stain on the ceiling under an attic air handler
• Sweating vents or a filter that turns gray in a couple of weeks

A technician can check the coil and the condensate drain line (the pipe that carries water away from the AC), look at the ductwork for leaks and crushed runs, measure humidity and airflow, and talk through filtration or a whole-home dehumidifier. Leaky return ducts in a dusty 130°F attic are a common source of both dust and humidity. Our guide on why a house feels humid with the AC running covers the usual causes. Gold Eagle’s technicians handle this work, from drain lines and ducts to humidity and air quality, across the Austin area.

When should you call a plumber?

When water is coming from a pipe, a fixture or a drain. That includes a drip under a sink, a damp cabinet floor, a weeping water heater, wet flooring near a tub or toilet, and a slow leak behind the washer. A plumber also handles a sewer smell, which usually means a dry drain trap, a bad wax ring (the seal under a toilet) or a problem with the plumbing vent. A rotten-egg smell near a gas appliance is different: leave the house and call your gas company from outside.

One overlap to know: if water is pooling around the indoor AC unit or the AC’s drain line is backing up, that’s an HVAC call, not a plumbing one.

When should you call a roofer?

When the water shows up after rain. A ceiling stain that grows after a storm, damp insulation near a vent pipe or chimney, or daylight showing through the roof deck in the attic all point to the roof. Fix the roof before anyone repairs the drywall or removes mold, or the problem will come back with the next storm.

If a ceiling stain shows up in August during a dry spell, look at the AC first. An attic air handler with a clogged drain is one of the most common reasons for a summer ceiling stain in Austin.

Who tests for mold in Texas?

A licensed mold assessor. In Texas, mold assessment and mold remediation are licensed by the Texas Department of Licensing and Regulation (TDLR), and they’re separate licenses. The assessor inspects the home, can take samples, and for larger jobs writes a plan, called a protocol, that spells out what needs to be removed and how.

Gold Eagle doesn’t do mold testing. We remediate mold in HVAC systems, and Texas rules keep those roles apart for good reason: the person who decides how big the problem is shouldn’t be the one who gets paid to fix it. Our guide on mold testing methods explains what different tests can and can’t tell you.

Who removes mold in Texas?

A licensed mold remediation company. Gold Eagle is one (Texas license RCO1783), and we handle mold in the HVAC system: the air handler, coil, drain pan and ducts. Mold in walls, floors or the rest of the house goes to a general mold remediation company.

For mold covering 25 square feet or more in one area, Texas rules call for a licensed assessor’s protocol first, then a licensed remediation company to do the work, and the assessor and the remediator on the same project must be different companies. After the work, the assessor checks the area to confirm it passed.

Smaller areas and homeowners working on their own home have different rules, but the order still makes sense: stop the water, find out how far the mold goes, remove it properly, then fix whatever caused the moisture. If the cause is the AC, the ducts or indoor humidity, that last step is HVAC work too.

What if you’re worried about how the air affects your health?

Talk to your doctor. An HVAC company, an assessor and a remediation company can tell you what’s going on with the house, the air handler and the ducts. None of them can tell you what it means for a person’s health, and a good one won’t try.

What should you do next?

• Stop any active water leak and call a plumber or roofer if it’s theirs.
• If the air feels sticky, dusty or musty when the AC runs, have an HVAC company check humidity, airflow, the drain line and the ducts.
• If you think there’s mold, call a licensed mold assessor first, then a licensed remediation company that is a separate company.
• If it’s an HVAC problem, schedule a Gold Eagle visit.

Related guides: What Is the IICRC S520, and How It Fits With Texas Mold Rules, What to Do in the First 48 Hours After a Water Leak and Warning Signs of Mold in Your HVAC System (And What to Do About It).

About Gold Eagle Services: This guide comes from the team at Gold Eagle Services, a family-run Austin HVAC, indoor air quality and mold remediation company founded in 2017. We’re licensed (TACLA119235 and RCO1783), insured and bonded, and we serve homes across the greater Austin area.

Need help with this in your home? Learn about our HVAC mold remediation, or call 512-489-4653 to schedule a visit.

Related Gold Eagle service: HVAC mold remediation