Ductwork Services in Los Angeles: Inspection, Repair, and Sealing

Los Angeles homeowners face duct challenges shaped by the city's enormous housing variety and its mild-to-hot microclimates. Older Craftsman homes in neighborhoods like Highland Park and West Adams often hide original galvanized ducts in cramped crawlspaces or shallow attics, while postwar tract homes in Mar Vista and Eagle Rock feature mid-century systems that were never sealed to modern standards. Meanwhile, multi-story condos and split-level hillside properties from Silver Lake to Pacific Palisades present access obstacles that make duct inspection and repair labor-intensive. When your HVAC system runs harder to push air through leaky, undersized, or disconnected ducts, you pay for it every month on your DWP bill.

Duct leakage often goes unnoticed until a room stays stuffy or your energy cost jumps unexpectedly. Studies show that 20 to 30 percent of conditioned air escapes through leaks, gaps, and poor connections before it reaches your living space. In a city where summer heat inland and year-round moderate coastal temps keep systems running frequently, that wasted air adds up fast. We inspect ducts using pressure testing, seal leaks with mastic and foil tape, and replace collapsed or vermin-damaged sections. If you are upgrading your AC or furnace, coordinating duct repair or replacement at the same time ensures your new equipment performs at its rated efficiency. Learn more about pairing upgrades on our <a href='/services/ac-installation'>AC installation</a> and <a href='/services/ac-maintenance'>AC maintenance</a> pages.

California Title 24 energy code requires duct leakage testing when you replace more than 40 feet of ductwork or install a new HVAC system in an altered space. The test measures how much air escapes at a standard pressure, and your system must meet a maximum leakage rate to pass final inspection. Most Los Angeles jurisdictions enforce this through final documentation, and failing the test means additional sealing work before you get sign-off. Beyond code compliance, properly sealed ducts qualify your home for utility rebates and make your equipment eligible for manufacturer efficiency warranties that assume minimal duct loss.

Duct sealing for a typical single-family home in Los Angeles runs between $800 and $1,800, depending on access difficulty and the extent of leaks. Full duct replacement, common in homes with original 1940s or 1950s systems, ranges from $3,500 to $7,000. The payback period varies with how much conditioned air you were losing and your current energy rate, but most homeowners see a 15 to 25 percent drop in heating and cooling costs after professional sealing. We provide written estimates, coordinate Title 24 testing with an experienced HERS rater when required, and walk you through any available rebate paperwork. The California Energy Commission offers detailed guidance on duct sealing standards and efficiency requirements that apply statewide.