Air Duct Replacement in Dallas, TX

When does replacing duct beat cleaning it?

The honest answer is usually visible in the attic. Cleaning moves debris out of a duct. It does nothing for a flex run whose outer jacket has gone brittle from UV and attic heat, or whose inner core has collapsed behind a kink. Gray and black flex from the 1970s and 80s falls apart when handled. Same story with 1950s-70s rigid trunks lined with fiberglass duct liner. Once that liner sheds, brushing it only releases more fiber. Those get replaced, not scrubbed.

Replacement here is mostly layout work, not material swapping. Sagging R-6 and R-8 flex draped between joists costs static pressure every foot. We pull runs tight, support them on wide straps, and shorten paths where the plenum allows. Boots get mastic and mechanical fasteners. Cloth tape is the failure point on nearly every older boot we open.

Return-side leakage deserves its own look. A leaky platform return pulls attic insulation fiber and dust past an undersized filter rack. Fixing the filter rack is often part of the job.

What makes a replacement bigger: run count, attic clearance, and whether the trunk is reusable. Also whether the system was ever sized for the duct you have. A partial replacement is legitimate when only branch runs failed.