Air Duct Replacement in Houston, TX

When is replacing ductwork the right call instead of cleaning it?

Cleaning helps when the duct wall is intact. It does not help when the wall is the problem. Pre-1970 galvanized trunk-and-branch lines with original fiberglass liner shed fiber no matter how carefully they're brushed. Ductboard plenums from the 1960s through the 1980s erode on the inside face. Flex duct with a torn outer jacket pulls humid attic air straight against the inner core. Those are replacement conditions, not cleaning conditions.

Check it yourself before anyone sells you anything. In the attic, follow a flex run where it crosses the joists. Look for deep sag, crushed bends, and silver tape that has let go. Squeeze a section gently. Grit or loose fiber means the core is breached. At the air handler, look at the plenum seams and the drain pan area for staining.

Replacement is also the moment to fix return sizing. Houston returns are often undersized and bypass air around the filter edge. New runs get strapped at proper intervals, hard elbows at tight boots, and mastic at every collar. Attic access panels and wall chases get sealed so cellulose and fiberglass stop migrating in.

If only two runs are damaged, say so. Replacing eight is not better.