Los Angeles Mediterranean summers push air conditioning systems hard, and many homes in Hollywood, Echo Park and Boyle Heights still run original sheet-metal or flex ducts installed decades ago. These ducts often develop separations at joints from decades of thermal expansion, seismic settling on the local hills, and the constant dust load carried in from the dry air. Left unsealed, even small gaps send conditioned air into attics or crawl spaces while pulling fine particles back into living areas.
Repair work here usually starts with a pressure test to locate leaks rather than blanket replacement. In Westwood and Koreatown bungalows, technicians often find crushed or disconnected flex runs above dropped ceilings where access is tight. Rigid metal sections in South Central and East Los Angeles homes frequently need new mastic seals and external insulation wraps to stop condensation during the occasional humid marine layer. Every job accounts for the fact that most single-family stock predates current energy codes, so repairs must improve performance without triggering full permitting unless the system is being altered.
Homeowners in Santa Monica and Venice also face salt-air corrosion on exposed rooftop ducts, while inland neighborhoods like Glendale and Burbank deal with higher attic temperatures that accelerate insulation breakdown. Proper repair restores balanced pressure across the system so the unit does not short-cycle or overwork the blower motor.
Technician insight
In Los Angeles the thing that catches most people out with ductwork repair is how settling on the local hills pulls apart original sheet-metal joints in pre-1970 bungalows in Silver Lake and Echo Park; one small separation can dump 20 percent of your cooled air into the attic during the long dry summers.
Disconnected Flex in a Hollywood Hills Home
A 1962 bungalow near the Hollywood Sign had weak airflow on the second floor during peak summer heat. Inspection found two flex runs pulled apart where the hillside had shifted. Technicians replaced the damaged sections, resealed the trunk line, and retested pressure. The homeowner reported even temperatures and lower runtime on the unit afterward.
Ductwork Repair Services We Offer
✓Duct Leak Sealing
Locates and seals gaps in sheet metal and flex runs using mastic and mesh to stop conditioned air loss common in pre-1970s Los Angeles homes.
✓Duct Insulation Repair
Replaces or adds R-8 wraps on attic and crawl-space ducts to reduce heat gain during long, warm Los Angeles summers.
✓Flexible Duct Replacement
Removes crushed or disconnected flex sections and installs new insulated flex with proper supports in tight Hollywood and Silver Lake attics.
✓Rigid Metal Duct Patching
Repairs seams and joints on galvanized trunk lines found in older East Los Angeles and Boyle Heights houses without full demolition.
✓Attic Ductwork Assessment
Pressure tests and visually inspects entire duct runs above ceilings in Santa Monica and Westwood homes before recommending targeted fixes.
Ductwork Repair Cost in California
| Service | Typical Range | What Affects It |
|---|---|---|
| Duct Leak Sealing | $300–$650 | Varies with number of leaks and attic access in older homes |
| Flexible Duct Section Replacement | $250–$550 | Per run; higher in tight Santa Monica attics |
| Insulation Wrap Addition | $200–$450 | Depends on total linear feet exposed to summer heat |
| Full Attic Duct Assessment | $150–$275 | Includes written findings for homes in hilly neighborhoods |
Ranges are typical for California and confirmed with an exact written quote before any work starts.
How it works
- 1
Initial Pressure Test
Technicians close off registers and measure static pressure to identify leak locations without guessing in older Los Angeles duct systems.
- 2
Access and Inspection
Openings are made at key points in attics or crawl spaces common to Hollywood and Echo Park homes to reach damaged sections.
- 3
Repair or Section Replacement
Leaks receive mastic and mesh; damaged flex or metal pieces are swapped using materials suited to local dry-climate conditions.
- 4
Re-Test and Airflow Check
System is re-pressurized and supply temperatures are verified at registers to confirm balanced delivery before closing access points.
Pricing
Upfront quotes based on access difficulty and linear footage; open Mon–Fri 8am–6pm, Sat 9am–2pm.