LC Heating & Air provides professional duct sealing services in East Hollywood to stop energy loss, improve airflow, and increase your home's comfort. We use duct blaster testing to identify leaks and provide permanent, code-compliant sealing solutions.
If your HVAC system is running constantly but your home still feels uneven, or if your energy bills seem higher than they should be, the problem often isn't the equipment itself—it's the ductwork. In East Hollywood, we see a lot of older homes and remodels where the duct system has never been properly sealed or has degraded over time.
At LC Heating & Air, I believe in being straightforward about what your home actually needs. Duct sealing is one of the most effective ways to improve your home's efficiency. We don't just guess where the leaks are; we use diagnostic testing to find them, and then we apply the right fix—whether that's manual mastic sealing or Aeroseal—to get your system performing the way it should.
Local HVAC considerations
East Hollywood (90027) and surrounding neighborhoods
CSLB #1073586
(323) 970-3113
Why Duct Sealing Matters in East Hollywood
In East Hollywood, many homes have ductwork running through attics, crawl spaces, or wall cavities. When these ducts leak, you aren't just losing air; you're paying to heat or cool your attic or garage instead of your living room. This is a common issue in our local housing stock, especially in older homes where flex duct has aged or sheet metal joints have loosened.
Duct sealing is a high-ROI improvement. Studies of California homes show that sealing 20–30% of duct leakage can reduce HVAC energy use by 15–25%. Because we deal with LA heat and dust, a sealed system also helps keep your indoor air cleaner by preventing the system from pulling in attic dust and wildfire smoke through those leaks.
Understanding Your Home's Ductwork
East Hollywood is a mix of single-family homes, duplexes, and small multifamily buildings. Each type presents different challenges for ductwork. In older homes, we often find original ductwork that wasn't designed for modern high-efficiency equipment. In remodels, we sometimes find crushed flex duct or systems that were never properly balanced.
Before we recommend any work, we look at the whole picture: equipment placement, duct condition, and airflow. If your system is worth repairing, we will tell you. If the pattern of leakage and the age of the equipment point to replacement, we will explain why. We want you to have a system that fits your specific property.
Our Diagnostic Process
We don't start sealing until we know exactly what we're dealing with. We start with a duct blaster test to quantify your leakage as a percentage of total airflow. This gives us a baseline.
Once we have the numbers, we decide on the best approach. If the leaks are in accessible areas like plenums or joints, we use manual mastic sealing. If the leaks are distributed throughout the system in inaccessible areas, we use the Aeroseal process. After we finish, we run a post-sealing verification test to prove the work was done correctly and provide you with the documentation.
Repair vs. Replacement
A common question I get is whether it's worth sealing old ducts or if they should just be replaced. If the ductwork is structurally sound but just leaky at the joints, sealing is a permanent, cost-effective solution. However, if the ducts are crushed, moldy, or undersized for the equipment, sealing won't fix the underlying airflow problem.
We are honest about this. If your system is worth repairing, we will tell you. If the pattern points to replacement, we will explain why. Our goal is to provide a solution that makes sense for your home and your budget, not to upsell you on work you don't need.
Cost and Value Factors
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. Both options include the necessary before-and-after testing.
When you consider that sealing can reduce your energy use by up to 25%, the payback period is often under two years at current LA electricity rates. We provide written estimates so you know exactly what you're paying for before we start.
Access and Scheduling
We know your time is valuable. Most residential duct sealing projects are completed in a single day. For the Aeroseal process, we do ask that you vacate the home for about 60–90 minutes during the injection phase as a precaution, though the material is non-toxic and used in many food products.
We check access, electrical, and equipment placement during our initial visit to ensure we can complete the job efficiently. If you have questions about how we'll access your attic or crawl space, just ask—we're happy to walk you through the plan.
Common Duct Sealing Mistakes
One of the biggest mistakes I see is the use of standard 'duct tape'—the silver cloth tape you find at the hardware store. It dries out and fails within a few years. We use professional-grade mastic that stays flexible and lasts for the life of the duct system.
Another mistake is skipping the duct blaster test. Without testing, you have no way of knowing if the sealing actually worked or if you've missed major leaks. We always perform before-and-after testing to ensure the job is done right.
Health and Safety
Your indoor air quality is a priority. Duct sealing helps prevent your system from pulling in dust, insulation fibers, and other pollutants from your attic or crawl space. The Aeroseal process is safe and non-toxic, and we ensure your system is clean before we start.
We are a licensed C-20 HVAC contractor (CSLB #1073586), so we follow all safety protocols and California Title 24 requirements. If your duct sealing is part of a larger HVAC replacement, we ensure all documentation is handled for your permit.
Is Duct Sealing Right for Your Home?
If your HVAC system is struggling to keep up, or if you notice significant dust accumulation near your registers, it's time to look at your ducts. We start with a diagnostic visit to see if your system is a good candidate for sealing.
If the system is worth repairing, we will tell you. If the pattern points to replacement, we will explain why. We provide written estimates so you can make an informed decision at your kitchen table, without any pressure.
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
- • Duct inspection: $125–$200
- • Duct cleaning (whole house): $400–$900
- • Duct sealing: $1,000–$3,000
- • Duct repair or replacement: $500–$5,000
Useful next steps
Duct Sealing in East Hollywood at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: East Hollywood, CA 90027
- • 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 East Hollywood
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for East Hollywood 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 East Hollywood customers say about duct sealing
Verified reviews from homeowners in East Hollywood 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.”
