Duct Repair and Sealing in Brentwood: Fix the System, Not Just the Equipment

Brentwood's housing stock includes plenty of homes built well before flex duct was standard, alongside later remodels and additions where flex duct got added during a renovation under a tight timeline. On the older runs we see sharp bends, crushed boots, and disconnected joints from decades of attic heat cycling; on the newer additions we see the same problems from a rushed install. When summer temperatures push into the 90s and your AC runs nonstop, leaky attic ducts pour cool air into a 140° attic instead of your bedroom, you lose 20 to 30 percent of your system's output before it reaches the register. That makes bedrooms stuffy, drives up utility bills, and forces your compressor to cycle longer than it was designed for.

Any remodel or addition also means a tighter building envelope in that part of the house, which sounds good until duct leakage creates negative pressure and starts pulling dust, insulation fibers, and attic air into your living space. We inspect ductwork with a blower door and pressure pan, seal accessible joints with mastic, replace crushed flex runs, and retest to Title 24 standards before we leave. Properly sealed ducts drop your cooling cost, balance airflow between rooms, and stop overworking your system. If you installed a high-efficiency AC but your upstairs still bakes in July, the ductwork is the most common culprit, and it's fixable without tearing open walls.

California's Title 24 energy code requires duct leakage testing on all new systems and local compliance requirements duct alterations, measured in cubic feet per minute at 25 pascals of pressure. Most existing homes test above 15 percent leakage; sealing and retesting can bring that below 6 percent, which qualifies the job for utility rebates and immediate comfort payback. We perform HERS-verified duct testing, document before-and-after results, and submit paperwork to SCE or SoCalGas on your behalf when rebates apply. The test takes about 90 minutes and pinpoints exactly which joints and plenums are bleeding conditioned air.

Duct sealing also pairs well with system replacement, if you're upgrading to a high-SEER2 unit, sealing the ducts first means the new equipment performs at its rated efficiency from day one instead of wasting capacity on leakage. We recommend an inspection every time you replace your air handler or if rooms have become noticeably harder to cool over the past few seasons. Proper duct sealing pays back in lower bills within two cooling seasons, and it extends compressor life by reducing runtime. Most Brentwood homes finish the full seal and retest in one day with no drywall cuts required.