HVAC Support
HVAC duct sealing & replacement in Los Angeles
A new AC or heat pump is only as good as the ducts that deliver the air. HUS tests for leakage, then seals, resizes or replaces ductwork so comfort and efficiency actually reach the rooms.
Licensed in California · CSLB #1031989 for HVAC · Top 500 Remodeler · Serving Greater Los Angeles
✓ Daikin Elite Dealer
Seal, resize or replace
Direct answer
How do you know if your ducts need sealing or replacement?
Ductwork usually hides in unconditioned attics and cramped crawlspaces, so leaks go unnoticed until a major HVAC upgrade. Hot or cold rooms, dust, high bills and weak airflow are common signs of significant leakage.
The real fix starts with a duct test that measures leakage, then decides whether the system can be sealed, needs automated sealing, or should be replaced.
Free HVAC estimate
Get your free HVAC estimate
Tell us where to send it. A HUS advisor follows up with your options, timeline and available incentives. No pressure.
- Licensed & insured California contractor, CSLB #1031989
- One trusted team, upfront itemized proposals
- No pressure, no obligation
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A HUS advisor will reach out shortly with your HVAC estimate. Prefer to talk now? Call (833) 446-6387.
Local planning intelligence
What actually matters with Los Angeles ductwork
Why LA ducts are usually worse than average, and how the right fix is chosen.
Signs of duct leakage
Uneven room temperatures, dust, high bills and weak airflow point to leakage, disconnected runs or damaged insulation.
Why LA ducts run worse
Older homes, hot attics and long attic runs mean Los Angeles ducts often lose more than average, which a duct test can measure.
Aeroseal automated sealing
Aeroseal pressurizes the system and injects a sealant that bonds to leak edges, sealing holes up to 5/8 inch from inside the ducts.
Measured before & afterWhen to replace entirely
Crushed, disconnected or badly undersized ducts are replaced and resized rather than sealed, so airflow is correct.
Your HUS Blueprint™
Start with a Blueprint, not a sales pitch.
Answer a few questions about your home and goals. The Planner assembles a home-specific plan you can actually review.
- Address confirmed
- Utility detected
- Home profile added
- System selected
- Rebate path reviewed
- Blueprint ready
What we install & service
Duct testing, sealing and replacement.
Duct leakage testing
A measured duct test establishes the real leakage rate before any work is quoted.
Aeroseal automated sealing
Automated internal sealing for systems that are sound but leaking at the seams and joints.
Manual sealing & repair
Accessible joints, boots and connections sealed and secured by hand.
Duct replacement & resizing
Crushed, disconnected or undersized runs replaced and resized for correct airflow.
Return air & static pressure
Return sizing and static pressure corrected so the system breathes.
Insulation & sealing at the unit
Duct insulation and sealing at the air handler or package unit.
Learn more →
Clean installation
Equipment should fit the home, not the other way around.
Placement, line-set routing, sound levels and sight lines are part of the plan. A recent HUS heat pump installation on the Westside, finished the way it should be.
Equipment
HVAC equipment we review before replacement
Before replacing an AC system, HUS reviews the outdoor condenser, indoor coil, furnace or air handler, ductwork and return air, line set, thermostat and zoning, and the electrical disconnect. Homes with rooftop or all-in-one systems may need packaged-unit planning instead of a standard split. A right-sized plan looks at the whole system, not just the outdoor unit.
Duct sealing options compared
| Method | What to verify | Result Level | Best For |
|---|---|---|---|
| Manual Mastic + Tape | Access and scope | 75-85% Tightness | Fully accessible ducts in open attics/crawlspaces |
| Aeroseal (Automated) | Equipment and access | 95%+ Tightness (Certified) | Hard-to-reach ducts inside walls or tight ceilings |
| Full Duct Replacement | Full replacement scope | 100% (New R-8 Insulated) | 30+ year old ducts, asbestos, undersized systems |
How automated (Aeroseal) duct sealing works
- Preparation: registers, vents and the main return opening are blocked to close the system.
- Pressurization: the duct system is connected to the Aeroseal machine and pressurized to a controlled level.
- Injection: an aerosolized, water-based sealant is injected into the duct stream.
- Targeted bonding: the sealant particles flow toward the leaks and bond to the leak edges.
- Verification: software measures the leakage rate before and after, so results are documented.
Why HUS
One trusted team, one accountable plan.
One team
HVAC, electrical, permits and rebates coordinated by one licensed team. No handoffs between contractors.
Real planning
Every project starts as a Blueprint: sizing, scope, equipment tier and rebate path, documented before work begins.
Licensed work
California licensed and insured. CSLB #1031989 for HVAC.
Manufacturer-backed systems
Equipment from established manufacturers, installed to spec so the warranty means something.
Clean installation
Protected floors, tidy line sets, hauled-away old equipment, and a final walkthrough.
Comfort & Satisfaction Guarantee
The same guarantee that backs every HUS project. Maintenance, tune-ups, and a team that answers the phone after the install.
★★★★★
Real reviews from HUS homeowners
“They were super fast to respond and equally fast in scheduling time to come out. Elia came out to perform my service and inspection. He was incredibly knowledgeable.”
“We are so happy with our decision to use Home Upgrade Specialist for our HVAC install. We live in a 2-story historic craftsman… and a desire to keep its historic integrity.”
“I would give 10 stars if I could. Raymundo A is the real MVP who saved my day… Now I know whom to call if I have any HVAC issues. Highly, highly recommended!”
Questions Los Angeles homeowners ask
Answers, before the site visit.
How much does HVAC duct sealing cost in Los Angeles?
Cost depends on access, attic or crawlspace conditions, home size, duct material, leakage level, insulation, and whether the ducts can be sealed or need replacement. A duct test and assessment give a real number.
How much energy do leaky LA HVAC ducts waste?
Older Los Angeles homes can lose real comfort and efficiency through duct leaks, damaged insulation and disconnected runs. The actual leakage level should be measured with a duct test.
What is Aeroseal?
Aeroseal is an automated duct sealing process that pressurizes the duct system and injects an aerosol sealant that bonds to leak edges, sealing holes up to 5/8 inch. The process typically takes 4 to 8 hours.
Related HVAC pages
Ready for a duct assessment in Los Angeles?
Start with a measured duct test, then a clear plan to seal, resize or replace, so a new system performs the way it should.