Air Duct Mold Removal in Houston, TX

Air duct mold removal in Houston homes

Houston attics stay humid most of the year. Cold supply air moves through duct hung in that heat. Any gap in the insulation makes a cold spot. Cold spot plus humid air equals condensation. Growth starts there, not everywhere. That is why we open the return and the plenum first.

Material decides the method. Fiberglass ductboard plenums and trunks from the 1960s–80s cannot be scrubbed clean. Once the facing degrades, the board holds water inside the fiber. Wiping it sheds more fiber. That section gets cut out and replaced. Galvanized trunk in 1950s–60s ranch stock is different (bare metal can be cleaned and stays clean). Flex duct with growth on the inner liner is replaced, not treated.

Finding the moisture matters more than the cleaning. Common sources here: a rusted drain pan, a corroded evaporator coil, a disconnected return pulling attic air, or an oversized system that short-cycles and never dehumidifies. Clean ducts over a wet coil regrow.

Check it yourself before calling. Pull a supply register and look at the boot with a flashlight. Look for dark speckling on the metal and damp gray fiber. Musty odor only at startup points to the plenum.

Some systems are past cleaning. We will say so.