Air Duct Mold Removal in Chattanooga, TN

When mold gets into a heating and cooling system, it stops being a problem in one spot. Every time the system runs, it pulls air across the contaminated surfaces and pushes it into every room in the house. In Chattanooga, where air conditioners run hard from May into October and many systems sit in hot attics or damp crawl spaces, the conditions for HVAC mold are common.

Older homes in Northshore, Highland Park and St. Elmo that had central air added years after they were built often have duct runs squeezed through crawl spaces and attics with little insulation. Those ducts carry cold air through hot, humid spaces all summer, and the outside of the duct sweats. Over time that moisture soaks into the duct wrap, the framing it rests on and sometimes the ceiling below.

Where HVAC Mold Starts

• Evaporator coils and drain pans that stay wet all summer
• Clogged condensate lines that let water back up into the air handler
• Ducts in crawl spaces or attics that sweat because insulation is missing or torn
• Supply registers that drip condensation in humid weather
• Return air leaks pulling damp crawl space air into the system

Signs to Watch For

The most common sign is a musty or earthy smell that gets stronger when the system kicks on. You may also see dark spotting on vent covers or the ceiling around registers, find water around the air handler, or notice that allergy symptoms ease when you leave the house for a few days.

How We Clean It

We open up the system to see where the growth actually is rather than assuming. Accessible duct runs, plenums and registers are cleaned and HEPA-vacuumed under negative pressure so the debris doesn't spread through the house. Interior duct liner or flex duct that is badly contaminated usually cleans poorly and is better replaced. Coils and drain pans are cleaned so the system restarts clean, and we point out any HVAC repair, such as a clogged drain or missing duct insulation, that should be handled by your heating and cooling contractor.

Fix the Source Too

Duct mold is almost always a symptom. If the system is in a damp crawl space, our crawl space mold removal service may be needed as well, and a mold test before and after can show whether the indoor air has improved.

Keeping the System Clean

• Change filters on schedule, more often in heavy-use summer months
• Keep the condensate drain clear
• Fix sweating ducts by sealing and insulating them
• Keep indoor humidity in a reasonable range during summer