LC Heating & Air provides professional duct sealing services to stop conditioned air from leaking into attics and wall cavities. We use duct blaster testing to quantify your system's leakage and apply the right sealing method—whether manual mastic or Aeroseal—to improve your home's energy efficiency and comfort.
Duct Cleaning & Air Duct Service in Granada Hills
LC Heating & Air provides duct cleaning in Granada Hills — 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 Granada Hills, 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.
In Granada Hills, your HVAC system is only as effective as the ductwork delivering the air. If your ducts have leaks, you are paying to heat or cool your attic, crawl spaces, or wall cavities instead of your living room. At LC Heating & Air, we specialize in identifying and sealing these leaks to restore your system's performance.
I am Leo, owner of LC Heating & Air. I have seen countless homes in our area where the equipment is fine, but the ductwork is failing. Before you consider replacing a system, we look at the duct integrity. We provide clear, written estimates and use diagnostic testing to ensure the work we do actually solves the problem.
Call LC Heating & Air at (323) 970-3113 for scheduling and estimates.
Local HVAC considerations
Why Granada Hills Homes Need Duct Sealing
Granada Hills features a mix of hillside homes, canyon properties, and older custom builds where access to mechanical areas can be tight. Because of our local climate, including significant sun exposure and elevation changes, your HVAC system works hard to maintain comfort. When ducts leak, that hard-earned conditioned air escapes into unconditioned spaces, forcing your system to run longer cycles to reach the thermostat setpoint.
Common patterns we see include crushed flex duct in tight crawl spaces or sheet metal joints that have separated over time. These leaks don't just waste energy; they pull dust and debris from attics into your living space. We focus on return sizing, duct leakage, and register balance to ensure your system is actually delivering air where you need it.
Understanding Your Home's Ductwork
Whether you live in a custom hillside home or a standard suburban property, the layout of your ducts is unique. Many older homes in Granada Hills were built with duct systems that were never properly sealed or insulated. Over time, the materials used to connect these ducts dry out and crack.
We approach every home by looking at the specific constraints—like ladder access, line-set routing, and service clearances—that are common in our local housing stock. We don't believe in one-size-fits-all solutions. We assess the physical condition of your ducts first to determine if they can be sealed or if they have reached the end of their service life.
Our Diagnostic Process
We don't guess. We start with a duct blaster test to quantify your existing leakage as a percentage of your system's total airflow. This gives us a baseline number so you can see exactly how much air is being lost.
Once we have the data, we determine the best approach. If the leaks are in accessible areas, we use mastic, which is a durable, flexible sealant that stays pliable for the life of the duct. If the leaks are distributed throughout the system in inaccessible areas, we use the Aeroseal process to seal them from the inside out. We finish with a post-sealing verification test to prove the improvement.
Repair vs. Replacement: Making the Right Choice
A common question I get is whether to patch up old ducts or replace them entirely. If your ducts are structurally sound but have small leaks at the joints, sealing is a cost-effective, permanent fix. However, if the ducts are crushed, collapsed, or made of outdated materials that are falling apart, sealing won't be enough.
I will always tell you the truth about your system. If the repair will give you years of reliable service, that is what we will do. If the pattern of damage suggests that replacement is the more practical long-term investment, I will explain why. We want you to have a system that fits your home, not just a quick patch that fails in a year.
Cost Factors and Value
Duct sealing is one of the highest-ROI improvements for Los Angeles homeowners. By sealing 20–30% duct leakage, you can typically reduce HVAC energy use by 15–25%. At current electricity rates, this often pays for itself in under two years.
Costs vary based on the size of your home, the accessibility of the ducts, and the method required. Manual mastic sealing generally ranges from $400 to $1,200, while Aeroseal typically ranges from $1,500 to $3,000. We provide a written estimate after our initial diagnostic so you know exactly what to expect before we begin.
Health, Safety, and Compliance
Your health and safety are our priority. Duct sealing not only improves efficiency but also prevents the intake of dust, insulation particles, and attic pollutants into your home's air supply. Our Aeroseal process is non-toxic and safe, using materials similar to those found in common household products.
We also ensure all work meets California Title 24 compliance. If you are replacing your HVAC system, duct leakage testing is often required for the permit. We provide the necessary documentation to ensure your project is up to code and properly verified.
Common Mistakes We See
The biggest mistake I see is the use of standard silver cloth 'duct tape' on HVAC systems. It dries out, loses its adhesive, and falls off within a few years. We only use professional-grade mastic or foil-backed HVAC tape that is designed to last for the life of the system.
Another mistake is skipping the diagnostic testing. Without a duct blaster test, you have no way of knowing if the sealing actually worked or if you've missed major leaks hidden in the walls. We don't skip steps; we verify the results so you can be confident in the work.
Scheduling Your Service
We know your time is valuable. Most residential duct sealing projects in Granada Hills can be completed in a single day. Whether we are performing manual sealing or the Aeroseal process, we coordinate with you to ensure minimal disruption to your home.
Because our local area includes unique hillside access and narrow roads, we plan our logistics carefully before we arrive. Give us a call at (323) 970-3113 to discuss your system. We are ready to help you get your home's comfort back on track.
Is It Time to Seal Your Ducts?
If your HVAC system runs constantly but your home still feels uneven, or if your energy bills are higher than they should be, it is time to look at your ducts. We don't believe in high-pressure sales; we believe in showing you the data.
If you are ready to stop wasting money on conditioned air that never reaches your rooms, contact LC Heating & Air. We will come out, test your system, and give you an honest, practical assessment of what needs to be done.
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
- • System size and total square footage
- • Accessibility of ductwork in attics or crawl spaces
- • Current leakage percentage
- • Choice of sealing method (Manual vs. Aeroseal)
- • Existing condition of duct materials
Useful next steps
Duct Sealing in Granada Hills at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: Granada Hills, CA 91344
- • 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 Granada Hills
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Granada Hills 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 Granada Hills customers say about duct sealing
Verified reviews from homeowners in Granada Hills 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.”
