Air Duct Replacement in Santa Clara, CA

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

Ask this first: is the duct damaged, or just dirty? Cleaning moves dust. It does not fix a flex run that pulled off its collar in a hot attic, a crushed crawlspace branch, or ductboard plenum faces that have gone soft. Rodent nesting in crawlspace insulation is another line we don't cross. Contaminated fiber gets removed, not scrubbed.

Replacement here usually means one of two jobs. Under 1950s-60s raised-floor and slab-raised ranch homes, it's galvanized trunk-and-branch in a crawlspace, often sharing space with plumbing and cable work that crushed it. In 1980s-2000s subdivisions and AC retrofits, it's insulated flex through the attic, strapped and re-supported so it doesn't sag into long kinks.

The return side matters more than most homeowners expect. Gaps at the furnace base pull crawlspace or garage air past the filter. We seal that joint with mastic, not tape, because tape in summer attic heat is what failed in the first place.

Access drives difficulty. Hatch size matters, as does clearance over the air handler in a condo closet. Branch runs to back bedrooms add distance too. Permits and duct sizing get sorted before anything is cut. Partial replacement is often enough. We'll say so.