Professional duct sealing to stop energy loss and improve whole-home comfort. We provide expert diagnostic testing and sealing solutions tailored to your home's specific ductwork.
I'm Leo, owner of LC Heating & Air. If you are living in a Pico-Robertson home, you know that our local climate—with its mix of heat and dust—puts a lot of stress on your HVAC system. One of the most common issues I see in our neighborhood isn't the equipment itself, but the ductwork that carries the air. If your ducts are leaking, you are paying to heat or cool your attic, wall cavities, or crawl spaces instead of the rooms you actually use.
Duct sealing is one of the most practical, high-return improvements you can make. Whether we are using manual mastic sealing for accessible joints or Aeroseal for internal leaks, the goal is the same: making sure the air your system works hard to condition actually reaches your living space. We are a local, licensed contractor (CSLB #1073586), and we believe in giving you a clear, honest assessment of your system before we ever touch a tool.
Local HVAC considerations
Pico-Robertson and surrounding neighborhoods
CSLB #1073586
Duct leakage, airflow, and energy efficiency
Why Pico-Robertson Homes Need Duct Sealing
Pico-Robertson has a wide variety of housing stock, ranging from older single-family homes to small multifamily buildings and remodels. In many of these properties, the ductwork has never been inspected or sealed. Over time, joints separate, flex ducts get crushed, and sheet metal connections loosen. When this happens, conditioned air leaks into unconditioned spaces, which forces your HVAC system to run longer and work harder just to maintain a comfortable temperature.
I often see dust accumulation on supply registers or near duct seams, which is a tell-tale sign that your ducts are pulling in dirty air from attics or wall cavities. If your energy bills seem disproportionately high for the size of your home, or if you notice that some rooms are always hotter or colder than others, it is usually a sign that your duct system is leaking. We check for these patterns during our diagnostic process to see if sealing is the right fix for your specific setup.
Understanding Your Home's Ductwork
Because our neighborhood features everything from original construction to modern remodels, there is no one-size-fits-all approach to ductwork. Older homes often have sheet metal systems that have developed leaks at the joints over decades. Newer remodels might have flex ducting that was poorly installed or kinked during the construction process, which restricts airflow.
Before we recommend any repair, we look at the entire system. We check access, electrical, duct condition, and equipment placement. If your ducts are in good structural shape but just leaking at the seams, manual sealing is often the best path. If the leaks are hidden deep within the walls or ceilings, we look at Aeroseal. We don't just sell one solution; we look at what your house actually needs.
Our Diagnostic Process
We don't guess. Every duct project starts with a duct blaster test. This allows us to quantify exactly how much air your system is losing. By measuring the leakage as a percentage of total airflow, we can show you exactly where your system stands before we start any work.
Once we have the numbers, we walk you through the results. We explain whether your system is a good candidate for sealing or if there are structural issues that need to be addressed first. After the sealing is complete, we run the test again to verify the improvement. You get the before-and-after numbers in writing, so you know exactly what you paid for.
Repair or Replace? An Honest Look
A common question I get is whether a system should be repaired or replaced. If your ductwork is structurally sound but leaking, sealing is almost always the right choice. It is a permanent fix that improves efficiency for the life of the system. However, if the ducts are falling apart, heavily contaminated, or undersized for the equipment, sealing might be a waste of money.
My job is to be honest with you. If the system is worth repairing, I will tell you. If the pattern of damage points to replacement, I will explain why. We want you to have a system that fits your property, not a generic recommendation that doesn't solve your comfort issues.
Cost and Value
Duct sealing is one of the highest-ROI improvements for a home. Sealing 20–30% duct leakage typically reduces HVAC energy use by 15–25%. At current Los Angeles electricity rates, the payback is often under two years. We provide written estimates so you know exactly what the cost will be before we start.
Costs vary based on the size of your home and the accessibility of your ducts. Manual mastic sealing typically ranges from $400–$1,200, while Aeroseal internal sealing for a typical single-story home ranges from $1,500–$3,000. Both options include the necessary testing to ensure the job is done right.
Safety and Indoor Air Quality
Your health and safety are our priority. When we seal ducts, we are not just saving energy; we are stopping your system from pulling in dust, insulation fibers, and other pollutants from your attic or crawl space. For our Aeroseal process, we use a non-toxic polymer that is safe for your home. It is the same material used in chewing gum and many food products.
We also ensure that our work complies with California Title 24 standards. This means we verify that your system is operating safely and efficiently. We take the time to check your equipment placement and airflow to ensure that sealing your ducts won't create new issues, like excessive static pressure.
Mistakes to Avoid
The biggest mistake I see is using standard 'duct tape'—the silver cloth tape—to seal HVAC systems. It dries out, cracks, and fails within a few years. We use professional-grade mastic, which stays flexible and provides a permanent seal. Another mistake is ignoring the ductwork when replacing an HVAC unit. If you install a high-efficiency unit but leave the old, leaky ducts in place, you are losing a significant portion of the efficiency you just paid for.
Finally, don't assume that all duct cleaning or sealing services are the same. A professional service should always include a diagnostic test before and after the work. If a company doesn't measure the leakage, they can't tell you if they actually fixed the problem.
Scheduling Your Service
We know your time is valuable. Most residential duct sealing projects can be completed in a single day. When you call us at (323) 970-3113, we will discuss your home's layout and schedule a time to come out for an inspection. We check access, electrical, and duct condition before we provide any recommendations.
We serve the Pico-Robertson area and surrounding neighborhoods, including Beverlywood, Century City, and Miracle Mile. Whether you are preparing for an HVAC replacement or just want to improve your home's comfort, we are here to help.
Making the Right Choice for Your Home
Choosing to seal your ducts is a smart move, but it should be based on facts, not sales pressure. If your home is struggling to maintain a consistent temperature, or if your energy bills are higher than they should be, start by having a professional look at your ductwork. We will perform a diagnostic test to see if your system is leaking and, if so, how much.
If the system is worth repairing, we will tell you. If the pattern points to replacement, we will explain why. Our goal is to give you the information you need to make a decision that makes sense for your home and your budget. Give us a call at (323) 970-3113 to get started.
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 system size and complexity
- • Accessibility of ductwork in attics or crawl spaces
- • Current leakage rate of the system
- • Choice between manual mastic sealing or Aeroseal internal sealing
Useful next steps
Our duct sealing process in Pico-Robertson
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Pico-Robertson 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 Pico-Robertson customers say about duct sealing
Verified reviews from homeowners in Pico-Robertson 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.”
