Duct sealing is one of the highest-ROI home energy improvements available. By sealing 20–30% duct leakage, homeowners typically reduce HVAC energy use by 15–25%. LC Heating & Air provides both manual mastic sealing and Aeroseal internal sealing, backed by duct blaster testing to verify performance.
Duct sealing is one of the highest-ROI home energy improvements available to Beverly Glen homeowners. When conditioned air leaks into attic or wall cavities before reaching the living space, you're paying to condition space you don't occupy. Studies of California homes consistently show 20–30% duct leakage in older homes — and every percentage point of leakage reduction shows up directly in your utility bill.
At LC Heating & Air, I focus on the practical side of HVAC. I don't believe in selling services you don't need. If your ducts are in good shape, I'll tell you. If they are leaking enough to impact your comfort and wallet, I'll show you the data and explain the best way to fix them.
Local HVAC considerations
Beverly Glen and surrounding canyon communities
CSLB #1073586 (C-20 HVAC)
Emergency calls answered within 30 minutes
Why Duct Sealing Matters in Beverly Glen
In our canyon climate, duct sealing is critical because conditioned air often leaks into unconditioned attics or wall cavities. When your system is fighting to overcome heat gain in these spaces, it runs longer and works harder than it should. This is especially common in older homes where flex duct has degraded or sheet metal joints have loosened over time.
You might notice this if your HVAC runs constantly but struggles to reach the thermostat setpoint, or if you see unusual dust accumulation near your registers. These are clear signs that your system is pulling in attic air or losing the air you've already paid to heat or cool.
Understanding Your Home's Ductwork
Beverly Glen features a mix of coastal-influenced homes, from older properties with original sheet metal to renovated homes with modern high-efficiency systems. Regardless of the age of your home, the ductwork is the circulatory system of your HVAC. If that system is compromised, even the most expensive furnace or AC unit will underperform.
We often find that older homes in this area have ductwork that was never properly sealed during initial installation. Over the years, the constant expansion and contraction from our temperature swings cause these connections to fail. We inspect these systems to see if they are candidates for sealing or if they have reached the end of their service life.
Our Diagnostic Approach
I don't guess when it comes to your home's performance. We start every duct project with a duct blaster test. This allows us to quantify exactly how much air is escaping your system as a percentage of total airflow. It’s the only way to know if sealing will actually provide the return on investment you expect.
Once we have the data, we determine the right approach. If the leaks are at accessible joints and plenums, we use high-quality mastic. If the leaks are distributed throughout inaccessible areas, we use the Aeroseal process. We then perform a post-sealing test to verify the improvement and provide you with the documentation.
Repairing vs. Replacing Ductwork
Not every duct system can be saved by sealing. If your ducts are physically crushed, moldy, or falling apart, sealing is just a band-aid. In those cases, I will be honest with you and recommend replacement instead of wasting your money on a sealant that won't hold.
If the system is structurally sound but leaky, sealing is a permanent solution. Properly applied mastic and Aeroseal are rated for the life of the duct system. We look at the condition of the insulation and the integrity of the duct material before we ever suggest a repair path.
Investment and Efficiency
Duct sealing is a cost-effective way to improve efficiency. Manual mastic sealing typically ranges from $400 to $1,200, while Aeroseal internal sealing ranges from $1,500 to $3,000. These costs are often offset by the energy savings you'll see on your monthly utility bills.
We provide upfront, written estimates for all our work. We also ensure that any sealing performed as part of a larger HVAC project meets California Title 24 compliance standards, which is necessary for permit signoff and ensuring your home meets current energy codes.
Accessing Your System
Beverly Glen homes often present unique access challenges, including tight attic spaces, hillside foundations, and complex roof layouts. We plan our access routes carefully to ensure we can reach all necessary plenums and connections without causing damage to your home.
We respect your time and your property. Whether we are performing manual sealing or the Aeroseal process, we keep our workspace clean and communicate clearly about the timeline. Most residential duct sealing projects are completed in a single day.
Common Duct Sealing Mistakes
The biggest mistake I see is the use of standard silver 'duct tape' on HVAC systems. It dries out, cracks, and fails within a few years. We only use professional-grade mastic and foil-backed HVAC tape that is designed to stay flexible and hold a seal for the long haul.
Another mistake is skipping the pre- and post-testing. Without a duct blaster test, you have no way of knowing if the work was effective. We never skip this step because it’s the only way to prove that your money was well spent and your system is actually tighter.
Safety and Indoor Air Quality
Your health is the priority. When we use Aeroseal, we use a non-toxic polymer that is safe for your home. The process includes a cleaning phase to ensure your ducts are clear before sealing, and the material remains in the duct walls, not in the air you breathe.
We also ensure that all our work complies with life-safety codes. Proper duct sealing prevents the intake of air from attics or garages, which can contain dust, insulation fibers, or carbon monoxide. By sealing these leaks, we are protecting the quality of the air circulating through your living space.
Is Duct Sealing Right for Your Home?
If your energy bills are high despite a newer HVAC system, or if you notice significant temperature differences between rooms, it’s time to look at your ducts. We start with a professional inspection to see if your system is a candidate for sealing.
If the ducts are in good condition, we will provide a written estimate for sealing. If the ducts are damaged beyond repair, we will explain why replacement is the safer, more cost-effective choice. We don't push for unnecessary work; we focus on what makes sense for your specific 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 duct system
- • Accessibility of the ductwork (attic, crawl space, or finished walls)
- • Condition of existing ducts (sealing vs. repair)
- • Type of sealing method required (manual mastic vs. Aeroseal)
Useful next steps
Duct Sealing in Beverly Glen at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: Beverly Glen, CA 90077
- • 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 Beverly Glen
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Beverly Glen 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 Beverly Glen customers say about duct sealing
Verified reviews from homeowners in Beverly Glen and nearby neighborhoods who used our duct sealing service.
“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.”
“We converted our garage into an ADU and needed HVAC. LC installed a Mitsubishi single-zone mini split — permits, electrical, everything. The unit is so quiet you can barely hear it running. Our tenant loves it.”
“Got a 3-zone Daikin system for our craftsman home — bedrooms upstairs, living room downstairs. Each room has its own temperature control and the monthly electric bill is actually lower than our old window units combined.”
