LC Heating & Air provides professional duct sealing services to help San Fernando homeowners stop energy loss and improve home comfort. We use diagnostic testing to identify leaks and provide permanent sealing solutions.
Duct Cleaning & Air Duct Service in San Fernando
LC Heating & Air provides duct cleaning in San Fernando — including air duct cleaning, duct repair service, duct sealing, HVAC ductwork. Whether you need same-day service, a written estimate, or help deciding between repair and replacement, our licensed technicians handle every make and model.
We repair and service all major HVAC brands in San Fernando, including Carrier, Trane, and Goodman, and older or discontinued units. No matter the manufacturer, we diagnose the problem accurately and give you an upfront price before any work begins.
I’m Leo, owner of LC Heating & Air. I spend a lot of time in San Fernando attics, and I can tell you that the biggest energy thief in most local homes isn't the AC unit itself—it's the ductwork. If your system is leaking conditioned air into your attic or wall cavities, you are paying to cool spaces you don't even live in. That is money out of your pocket every single month.
My approach to duct sealing is simple: we measure first, then we seal. We don't guess where the leaks are. We use a duct blaster test to quantify exactly how much air you are losing. Once we know the numbers, we use the right tool for the job—whether that is manual mastic sealing for accessible joints or Aeroseal for those hard-to-reach leaks inside your walls. We are licensed (CSLB #1073586) and focused on getting your system running efficiently.
Call LC Heating & Air at (323) 970-3113 for scheduling and estimates.
Local HVAC considerations
San Fernando, CA 91340
CSLB #1073586
(323) 970-3113
Why San Fernando Homes Need Duct Sealing
San Fernando’s climate is tough on HVAC systems. With long summer run times and 95-100 degree days, your AC is already working hard. If your ducts are leaking, that system has to work even harder to compensate for the lost air. I often see homes in this area with original ductwork that has simply dried out or pulled apart at the seams due to the extreme heat in our attics.
When I inspect a home in 91340, I look for common patterns: crushed flex ducts, disconnected supply runs, and leaky plenums. These aren't just minor annoyances; they are the reason your living room stays hot while your hallway freezes, or why your energy bills seem disproportionately high for your home size. Sealing these leaks ensures that the air your unit works so hard to cool actually makes it into your living space.
Understanding Your Duct System
San Fernando has a mix of housing styles, from mid-century ranch houses to larger remodels. Many of these homes rely on attic-based duct systems. Over time, the materials used in these ducts—whether sheet metal or flex duct—degrade. The heat in a San Fernando attic is brutal, and it causes standard tapes to fail, leading to significant air loss.
If you are planning an HVAC replacement, you need to look at your ducts first. Putting a high-efficiency unit on a leaky duct system is like trying to fill a bucket with holes in it. We focus on the duct condition, insulation, and register balance to make sure the new equipment actually performs the way it was designed to.
Our Diagnostic Process
I don't believe in selling services you don't need. We start with a duct blaster test. This is a standard procedure where we pressurize your duct system and measure the airflow. It gives us a hard number on how much leakage you have.
Once we have the data, we show you the results. If the leakage is manageable through manual sealing, we use high-quality mastic. If the leaks are deep in the system where we can't reach, we use Aeroseal. After we finish, we run the test again to prove the difference. You get the documentation, and you get the comfort.
Repair or Replace?
Homeowners often ask me if they should just replace their ducts entirely. My answer is always the same: it depends on the condition. If your ducts are structurally sound but just leaky at the joints, sealing is the most cost-effective and practical solution. It’s a permanent fix that lasts for the life of the system.
However, if the ductwork is collapsed, moldy, or improperly sized for the home, sealing won't fix the underlying problem. In those cases, I will tell you straight that replacement is the better investment. I’m here to give you an honest assessment, not to push a specific product.
What to Expect on Costs
Duct sealing costs vary based on the size of your home and the complexity of the system. Manual sealing typically ranges from $400 to $1,200, while Aeroseal internal sealing for a typical single-story home runs between $1,500 and $3,000. These prices include the diagnostic testing before and after the work.
Think of this as an investment. Sealing 20–30% duct leakage can reduce your HVAC energy use by 15–25%. At current electricity rates, many homeowners see the cost of the service pay for itself in energy savings within two years. We provide written estimates so you know exactly what you are paying for before we start.
Access and Scheduling
Getting into your attic or crawl space is part of the job. I look at attic access, duct condition, and electrical capacity before we schedule anything. We want to make sure we can get the job done right without surprises.
Most residential duct sealing projects are completed in a single day. If we are using Aeroseal, we do ask that you vacate the home for about 60 to 90 minutes during the injection process, just as a precaution. We work around your schedule to make the process as smooth as possible.
Common Mistakes to Avoid
The biggest mistake I see is using standard 'duct tape'—the silver cloth stuff you buy at the hardware store—to seal HVAC ducts. It dries out, cracks, and falls off within a few years. It is not designed for the temperature swings in a San Fernando attic.
Another mistake is ignoring the ductwork when upgrading your AC. If you install a high-efficiency unit but leave the old, leaky ducts in place, you are wasting your money. Always test the ducts when you replace the equipment. It’s a requirement for permit compliance in California for a reason.
Health and Safety
Indoor air quality is a big deal. Leaky ducts don't just lose conditioned air; they can pull dust, insulation fibers, and other contaminants from your attic into your living space. By sealing your ducts, you are essentially closing the door on those pollutants.
If you are worried about the materials we use, don't be. The polymer used in Aeroseal is non-toxic and is the same material used in chewing gum. It stays inside the duct walls and doesn't get into your airstream once it cures. We prioritize your home’s safety as much as your comfort.
Is Duct Sealing Right for You?
If your energy bills are high, your home has uneven temperatures, or you notice dust buildup near your registers, it’s time to look at your ducts. You don't have to guess if you have a problem—we can measure it.
Call LC Heating & Air at (323) 970-3113. We will come out, inspect your system, and give you an honest answer about whether sealing will solve your comfort issues or if there is a bigger problem at play. We are here to help you make the right decision for your home.
How the visit works
We perform a duct blaster test to quantify existing leakage as a percentage of system airflow.
Based on leakage quantity, duct type, and accessibility, we recommend manual sealing, Aeroseal, or a combination.
We apply mastic to all accessible joints and plenums, or set up and run the Aeroseal process for internal sealing.
We re-run the duct blaster test and provide you with before/after leakage numbers as written documentation.
Cost factors we review before quoting
- • Total square footage of the home
- • Accessibility of the ductwork in the attic or crawl space
- • Amount of existing duct leakage measured by the duct blaster test
- • Choice between manual mastic sealing and Aeroseal internal sealing
Useful next steps
Duct Sealing in San Fernando at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: San Fernando, CA 91340
- • License: CSLB C-20 #1073586
- • Phone: (323) 970-3113
- • Estimate: written estimate before approved work
- • Emergency calls answered within 30 minutes (24/7)
Our duct sealing process in San Fernando
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for San Fernando is reviewed for practical HVAC accuracy by Leo at LC Heating & Air. LC Heating & Air holds California CSLB C-20 HVAC license #1073586 and provides written estimates before approved work.
What San Fernando customers say about duct sealing
Verified reviews from homeowners in San Fernando and nearby neighborhoods who used our duct sealing service.
“Our AC stopped working during a heat wave and LC had a technician here within two hours. He diagnosed a bad capacitor, had the part on his truck, and fixed it on the spot. Fair price, no upsell. Will use again.”
“Called on a Saturday because AC was blowing warm air. LC answered, sent someone the same afternoon. They found and fixed a refrigerant leak. Professional and reasonably priced.”
“Woke up to no AC at 6am. LC was at my door by 9am. Frozen evaporator coil — they explained exactly why it happened (dirty filter + low airflow) and fixed it same visit. Very professional.”
