Air Duct Replacement in Westlake Village, CA

When replacing duct beats cleaning it

"Can't we just clean these instead?" Sometimes, yes. The answer is in the inner liner. Vented attics here get punishing in summer (140 to 150F above the ceiling is normal). Flex liner goes brittle in that heat. It splits at bends and boots, or at the plenum collar. A brush in a cracked liner tears it wider. That run gets replaced, not cleaned.

Rodent contamination is the other clear case. Brush-adjacent and canyon properties get attic entry. Droppings and nesting work into the insulation jacket between liner and outer wrap. Nothing reaches that. The run comes out and the entry gap gets closed, or it happens again.

Replacement is also the one chance to fix airflow. Many 1970s and 80s tracts have a single undersized central return. Static pressure runs high and air bypasses the filter edge. Gray streaking shows at supply registers. Panned-joist and wall-stack returns in older two-story homes pull dusty cavity air outright. Those become sealed, ducted returns.

Original galvanized trunk in older Ventura County homes is often still sound. We reuse it and replace the flex branches, sealing takeoffs with mastic rather than tape. Replacing most of a system in California triggers a permit and third-party HERS duct leakage verification. Ask any contractor about that before signing.