Air Duct Repair in Irvine, CA

Why one room never cools, and what we find in the attic

The back bedroom stays warm. Register airflow feels weak. Usually the duct is still there. It has pulled off the boot collar. Flex runs sag between trusses, kink at tight turns, and dump conditioned air into the attic. The system runs longer. The room never catches up.

Repair starts at the plenum, not the register. We open the attic, trace each branch, and look at the takeoff collars on the sheet metal or ductboard plenum. Loose inner liner gets re-seated and clamped. Then it's sealed with mastic. Torn flex sections get replaced, not taped over. Compressed insulation is the other common fault. Bare core sweats and drips. A brown ring shows on the ceiling below.

Canyon-adjacent and foothill tracts bring a second problem. Rodents chew flex to get at the insulation. Those runs need replacing outright, along with boot and register cleaning. Older Irvine-area homes with rigid sheet metal trunks hold settled dust in horizontal runs. Those get brushed and pulled under negative pressure instead.

Some duct systems are past patching. When half the branches are crushed or hanging loose, sealing a few collars buys little. We will say so. Honest scoping beats a repair that fails next summer.