What to expect from LC Heating & Air
### The Hidden Cost of Leaky Ducts in LA Homes The Department of Energy estimates that typical residential duct systems lose 20–30% of conditioned air through leaks before it reaches the living space. In Los Angeles, where AC runs heavily from May through October, that means you're paying to cool your attic rather than your living room every summer. Duct repair is one of the highest-return HVAC improvements a Los Angeles homeowner can make — and it directly addresses the most common cause of comfort complaints (uneven temperatures, rooms that are always too hot or too cold).
Overview
### Signs Your Ducts Need Repair Most homeowners have no idea their ducts are leaking because the leaks are hidden in attics, crawl spaces, and wall cavities. We identify duct problems through a combination of airflow measurements (comparing what the equipment produces to what each room receives), duct pressurization testing, and visual inspection of accessible duct sections. Common damage we find: disconnected duct sections at joints and take-offs, torn flex duct inner liners, crushed flex duct from attic access foot traffic, failed mastic at supply plenums, and deteriorated tape joints on older sheet metal ductwork.
### Repair Methods Duct repair methods depend on the type of damage and duct material. Disconnected flex duct sections are reconnected and sealed with mastic and foil tape. Torn inner liners require section replacement. Sheet metal joints are sealed with mastic. For systems with widespread small leaks throughout the distribution system, Aeroseal duct sealing (an internal pressurized sealing process) can address leaks that aren't accessible for manual repair.
### Before and After Documentation We document duct leakage before and after repair using duct blaster testing — a pressurization test that quantifies total duct leakage as a percentage of system airflow. This gives you measurable proof that the work improved your system's performance.
Our Service Benefits
Duct Repair Cost in Los Angeles
Pricing ranges for common duct repair services. Your actual cost depends on equipment, complexity, and home configuration. We provide an exact written estimate before any work begins.
Service calls start at $125. Prices include parts and labor unless noted. Financing available on equipment installations. Learn about financing →
What Los Angeles Homeowners Say
“LC found that our ductwork had separated in the attic. Repaired everything and now every room heats equally. Professional and transparent.”
“LC was the only company that did a Manual J calculation. The new system cools better, runs quieter, and costs less to operate.”
“Switched from gas furnace to a heat pump. LC handled the TECH Clean California paperwork — got $2,500 rebate plus federal credit.”
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Signs you need duct repair
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(323) 970-3113 — Free diagnosisOur duct repair process
Duct diagnostic
We measure airflow at registers, inspect accessible ductwork, and perform duct pressurization testing to quantify leakage.
Repair plan
We identify the specific leaks and damage and present a repair scope with written pricing before any work begins.
Duct repair
We access damaged sections and seal with mastic, reconnect disconnected flex duct, and repair torn inner liners.
Post-repair verification
We re-test duct leakage after repair and measure airflow at registers to confirm improvement.
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Duct Repair — by city
Common questions about duct repair in Los Angeles
What customers say about duct repair
Verified reviews from Los Angeles homeowners who used our duct repair service.
“Our furnace wasn't heating evenly upstairs. LC found that half of our ductwork in the attic had separated and was blowing hot air into the attic. Repaired everything and now every room heats equally. Professional and transparent.”
“LC did a full duct inspection and found we were losing 35% of our conditioned air through disconnected joints in the attic. After sealing and repairing, the difference was immediate — better airflow, lower bills, no more hot spots.”
“Had LC install a Daikin mini split in our 1940s bungalow that never had AC. The work was clean, the unit is incredibly quiet, and our bedroom finally stays cool in summer. Highly recommend.”
