Duct Repair and Replacement in Los Angeles County
Some of the most costly HVAC problems are hidden from view. Even if your air conditioner or furnace works well, leaking, disconnected, crushed, or damaged ductwork can keep much of the air you pay to cool or heat from reaching your rooms.
ENERGY STAR says the average home loses 20 to 30 percent of its conditioned air due to duct leaks, holes, and poor connections. In the San Fernando Valley, where attic temperatures can reach 150 degrees, and ductwork faces months of extreme heat and cooling, these losses are often even higher.
Affordable Heating and Air offers duct inspections, repairs, sealing, and full replacements throughout Los Angeles County from our Chatsworth office. Our Simi Valley branch provides the same services in Ventura County.
(818) 722-1332 — Schedule a Duct Inspection · Book Online →
How Duct Problems Show Up in Your Home
Duct damage often comes without obvious warning signs. Instead, it causes problems that homeowners often mistake for other issues:
Rooms that never reach the set temperature: The AC or furnace works fine, but the air escapes through a duct leak or loose joint before reaching the room. The system runs longer, the room stays uncomfortable, and your energy bill increases.
Uneven temperatures in the house: One bedroom might be cold while another is warm, or the upstairs cools while the downstairs stays warm. This is often caused through duct distribution problems, not by equipment size.
Duct Repair vs. Duct Replacement: When Each Makes Sense
You do not always need to replace all your ducts. The most appropriate solution depends on the type and extent of the damage, as well as its location.
When A Duct Repair Is The Right Call
Duct repair fixes specific local problems without replacing the whole system:
Sealing leaks at joints, connections, and register boot using mastic sealant or code-approved tape (not standard cloth duct tape, which fails in attic heat). Reconnecting disconnected duct sections. Repairing small tears or punctures in the flex duct outer jacket and insulation. Secure ducts that have fallen off hangers or settled onto the attic insulation. Replace damaged sections while protecting the rest of the system.
Repair makes sense when the duct system is mostly in good condition, and the damage is limited to areas that can be reached and repaired.
When Duct Replacement Is the Better Investment
Replacing all or part of your duct system is an excellent idea when the damage is widespread instead of limited to one spot:
The duct system is 25 to 30 years old, and the materials have deteriorated beyond repair. The flexible duct can collapse, kink, or compress over multiple runs. The existing duct size was inadequate for current HVAC equipment — a common issue in older Valley homes that have had equipment upgraded without corresponding duct modifications.
Duct insulation has degraded and crumbled, leaving bare or poorly insulated ducts exposed to attic heat. Multiple sections are leaking, disconnected, or damaged, making repair-by-repair less cost-effective than systematic replacement. You are installing updated HVAC equipment, but the existing ductwork cannot meet the airflow requirements of the new system.
When we recommend replacement, we design the replacement duct system using Manual D calculations to match your current equipment and airflow needs. We do not just copy the old layout.
Why Valley Ductwork Deteriorates Faster Than Most
San Fernando Valley homes deal with duct conditions that cause faster wear and tear than most national HVAC guidelines expect:
Extreme attic heat: Ductwork in Valley attics can face temperatures over 150 degrees for months. This constant heat breaks down duct sealant, loosens connections, damages insulation, and accelerates wear on flexible duct materials. The daily cycle of hot days and cool nights can cause materials to expand and contract, leading to joint failure.
Older tract home construction: Many Valley homes built from the 1960s to the 1980s have duct systems made for the equipment and standards of that time. The first R-4 or R-6 duct insulation was fine back then, but it does not meet today’s R-8 California standards. Return air plenums were often too small, and supply runs were installed for ease of construction rather than airflow.
Rodent and pest damage: Flex ducts in Valley attics are often damaged by rodents chewing, nesting, or contaminating them. Once the outer layer is compromised, the insulation quickly breaks down, and the duct can allow contaminated attic air into your system.
Previous equipment upgrades without duct changes: Often, homeowners replace their AC or furnace with an upgraded or more efficient model, but the ductwork is not checked or updated. The upgraded equipment moves more air or operates at a pressure that the old ducts can’t handle. This leads to turbulence, noise, and reduced airflow.
What Our Technicians Inspect
Every duct service starts with an inspection to see if you need repairs, sealing, partial replacement, or full replacement.
We check every accessible duct run for leaks, disconnections, kinks, compression, and insulation conditions. We measure static pressure at the air handler to see how the system is restricted.
Losing Air You Already Paid to Cool?
If your rooms do not reach the right temperature, your bills keep rising, or you see damaged ductwork in the attic, the problem is probably in the ducts between the equipment and the rooms, not the equipment itself. We inspect, document, and give you honest options.
Los Angeles County: (818) 722-1332 Ventura County: (805) 755-4074
Book Online →
Serving Chatsworth, Northridge, Granada Hills, Porter Ranch, West Hills, Van Nuys, Encino, Woodland Hills, Glendale, Burbank, Santa Clarita, and all of Los Angeles County. Ventura County services through our Simi Valley branch.
