Air Duct Repair in El Dorado Hills, CA

One bedroom never gets air, and the hallway door whistles

That pair of symptoms usually points at the ducts, not the equipment. In foothill tract homes built from the mid-1980s on, supply runs are insulated flex laid across attic joists. Flex sags. It kinks at turns. A sheet of stored plywood or a stepped-on run crushes the inner liner, and the far bedroom loses most of its air while nearer rooms stay fine. The furnace is working. The path is not.

Boots pull loose too. The collar separates from the register, and conditioned air dumps into a baking attic. The return side starts drawing attic dust, loose insulation fiber and rodent debris back into the house. You smell it before you see it. Door whistle is a separate tell: a single undersized return starving the blower, with pressure finding its way under doors.

Older valley-floor and postwar ranch homes bring different repairs. Galvanized trunk with round takeoffs, often lined with original internal fiberglass that is now shedding. Crawlspace metal that sweats and grows mildew smell. Fiberglass duct board plenums from the 1960s-80s that crumble at the corners.

Repair means resupporting, resealing, rebuilding boots, replacing collapsed sections. When a run is shredded or the liner is gone, replacing it beats patching it.