Air Duct Repair in Santa Clara, CA

Air duct repair in Santa Clara homes

A back bedroom stays stuffy while the hall register roars. Dust returns two days after you wipe. The first heat cycle in fall smells musty. Those are duct symptoms, not furnace symptoms. The equipment is usually fine.

Cause depends on what you have. Attic flex in 1980s-2000s subdivisions fails at the collar. Summer attic heat dries the mastic, cloth tape lets go, and the run slips off the boot or kinks over a truss. Under 1950s-60s raised-floor ranch homes, galvanized trunk-and-branch gets crushed by stored boxes and by plumbers crawling through. Rodents open the insulation. Return plenums leak at the furnace base and pull crawlspace or garage air straight into the blower.

Repairs are mechanical first. Drawband at the collar, mastic over mesh, flex re-hung so it does not sag belly-deep. Sheet metal joints get sealed, not taped. Leaky return plenums matter most. That gap draws valley silt and remodel dust all day.

Some runs are past patching. Liner torn along its length, nested insulation, or a soft wet ductboard plenum means replacement of that section.

Check it yourself: look for gray fan-shaped stains around register edges. That is air leaking where it should not.