Duct sealing is one of the highest-ROI home energy improvements available to Newhall homeowners. By sealing leaks, you stop paying to condition attics and wall cavities, ensuring your HVAC system delivers air exactly where you need it.
Duct Cleaning & Air Duct Service in Newhall
LC Heating & Air provides duct cleaning in Newhall — 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 Newhall, 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 Newhall crawl spaces and attics, and I see the same issue over and over: homeowners are paying to heat or cool their roof rafters instead of their living rooms. When your ductwork leaks, your HVAC system has to work twice as hard to keep up with the thermostat, which leads to premature equipment failure and high utility bills.
My approach is simple: we don't guess. We use duct blaster testing to measure exactly how much air you're losing. Whether we use manual mastic sealing for accessible joints or Aeroseal for those hard-to-reach spots, we make sure the job is done right so you stop wasting energy.
Call LC Heating & Air at (323) 970-3113 for scheduling and estimates.
Local HVAC considerations
Why Newhall Homes Need Duct Attention
Newhall has a mix of older multifamily properties and homes with compact mechanical closets. In these tight spaces, ductwork often gets crushed or disconnected during other home repairs, or it simply degrades over time. Because of our local heat-island effects, if your ducts are leaking in a hot attic, you are essentially pumping 130-degree air into your home during the summer.
I often see systems where the return air is pulling from a dusty attic or a garage because of poor sealing. This doesn't just hurt your energy bill; it pulls dust and pollutants directly into your living space. If your HVAC runs constantly but the temperature never feels quite right, the problem is usually in the ductwork, not the furnace or AC unit itself.
Understanding Your Duct System
Whether you live in a historic downtown building or a newer condo, your duct system is the lungs of your home. In many Newhall properties, we find original sheet metal ducts that have rusted at the seams or flex ducts that have been pinched in tight corners. If your ductwork was installed decades ago, the original tape has likely dried out and failed.
We look at the whole picture. Before we recommend any sealing, we check for crushed flex runs and insulation gaps. If the ducts are structurally sound but leaking at the joints, sealing is a great investment. If the ducts are falling apart or undersized, we'll tell you honestly that sealing won't fix the underlying airflow restriction.
Our Diagnostic Process
We start with a duct blaster test. This involves hooking up a specialized fan to your system to pressurize the ducts. We measure the leakage rate as a percentage of your total airflow. This gives us a baseline number so we can prove the effectiveness of our work later.
After the test, we walk you through the findings. We show you where the leaks are—whether it's a loose plenum connection or a series of small gaps in the attic. We don't start any work until you have a written estimate and understand exactly what we are sealing and why.
Repair or Replace?
I get asked all the time if a system should be repaired or replaced. If your duct system is in good shape but just has leaky joints, sealing is the most practical, cost-effective move. It saves energy and improves comfort immediately.
However, if the ducts are undersized for your equipment or the material is deteriorating, sealing is just a band-aid. If the system is worth repairing, we will tell you. If the pattern points to replacement, we will explain why—usually because the cost of sealing a failing system doesn't provide the long-term value you deserve.
What to Expect for Costs
Duct sealing costs vary based on the size of your home and the accessibility of the ducts. Manual mastic sealing typically ranges from $400 to $1,200, while the Aeroseal process for a typical single-story home ranges from $1,500 to $3,000. These prices include the diagnostic testing before and after the work.
We believe in transparency. We don't use high-pressure sales tactics. We provide a written estimate that covers the labor and materials required for your specific home. You'll know exactly what you're paying for before we start.
Access and Scheduling in Newhall
Working in Newhall often means navigating HOAs, shared walls, and limited parking. We are used to these constraints. Whether your unit is on a rooftop or tucked into a tight mechanical closet, we coordinate with you to ensure we have the access we need without disrupting your day.
We respect your time. We show up when we say we will, and we keep the workspace clean. Because we are a local contractor, we understand the logistical challenges of our neighborhood and plan our service calls to account for them.
Common Mistakes to Avoid
The biggest mistake I see is homeowners using standard silver 'duct tape' from the hardware store. That tape dries out, cracks, and falls off within a year or two. Real HVAC sealing requires mastic—a thick, permanent sealant—or professional-grade foil-backed tape.
Another mistake is ignoring the return side of the system. Many people focus only on the supply vents, but if your return ducts are leaking, you're pulling unconditioned air into your system, which makes your furnace or AC work much harder than it should.
Health and Safety
Your indoor air quality is a priority. When we seal your ducts, we are also preventing dust, insulation fibers, and pollutants from being sucked into your system from attics or crawl spaces. This is especially important for households with allergies or asthma.
Regarding the Aeroseal process, it is perfectly safe. The polymer used is non-toxic and similar to materials found in common household products. We take every precaution to ensure the process is clean and that your home is ready for you as soon as we finish.
Making the Right Choice for Your Home
Deciding to seal your ducts is a smart move for any homeowner looking to lower their energy bills and improve comfort. If you're planning an HVAC replacement, this is the perfect time to address the ductwork as well.
If you're unsure where to start, give LC Heating & Air a call at (323) 970-3113. We'll come out, inspect your system, and give you an honest assessment. If your ducts are in good shape, we'll tell you. If they need work, we'll show you the data so you can make an informed decision.
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 duct system
- • Accessibility of ductwork (attic vs. crawl space vs. walls)
- • Type of sealing required (manual mastic vs. Aeroseal)
- • Current condition of the duct material
Useful next steps
Duct Sealing in Newhall at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: Newhall, CA 91321
- • 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 Newhall
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Newhall 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 Newhall customers say about duct sealing
Verified reviews from homeowners in Newhall 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.”
