Licensed C-20 Ductwork & Duct Replacement
Duct Replacement & Ductwork Services in Los Angeles & Orange County
Your ducts are half your HVAC system — and in most LA and OC homes, they're the neglected half. Leaky, crushed, undersized, or badly routed ductwork wastes the air you've paid to condition, pulls dusty attic air into your home, and makes even a brand-new system underperform.
- 25 Years in Business
- 24/7 Emergency Service
- CA C-20 License #1094200
- Parts & Labor Guarantee
- Lifetime Guarantee
- Discounts Available
Why United Heating & Air Conditioning for ductwork & duct replacement
United Heating & Air Conditioning tests, repairs, seals, redesigns, and fully replaces residential ductwork across both counties. After 25 years inside Southern California attics and crawlspaces, we've seen every era of duct work — and we fix the actual problem instead of selling bigger equipment to push through bad ducts.
The fix equipment can't deliver
A bigger AC can't fix ducts that leak a third of their air into the attic. Duct repair often delivers more comfort per dollar than any equipment upgrade — and we'll tell you when that's your situation.
Testing first, recommendations second
We inspect and assess your duct system before recommending anything — and we show you what we found, in plain photos and plain language.
Sealing, repair, or full replacement
Sometimes sealing and a few repairs solve it. Sometimes 60-year-old ducts need to go. We quote the honest option, not the expensive one by default.
Better air, not just better airflow
Sealed, properly insulated ducts stop pulling dust, insulation fibers, and attic air into your living space — a real air quality upgrade that pairs naturally with filtration work.
Licensed & Accountable
A state-licensed contractor that stands behind the work
United Heating & Air Conditioning holds the CA State Warm-Air HVAC License C-20 #1094200 — the California license classification specifically for warm-air heating, ventilation, and air conditioning. 25 years in business, every job covered by our parts & labor guarantee, and our installations backed by a lifetime guarantee.
- 25 years serving LA & Orange County
- 24/7 emergency availability
- Parts & labor guarantee
- Lifetime guarantee on our installations
Related services
Where we provide ductwork & duct replacement
Ductwork & Duct Replacement is available across both counties — every city, every neighborhood, 24/7 for emergencies.
Popular service areas
Ductwork & Duct Replacement — common questions
How do I know if my ducts are leaking?
Telltale signs: uneven rooms, dusty vents, and high bills. We confirm with a physical inspection of the duct runs, connections, and insulation — and show you exactly what we find before quoting anything.
Should I replace my ducts when I replace my HVAC system?
It's the right time to evaluate them — the walls are open figuratively and the crews are there. If your ducts are sound, we'll say so. If they'll choke your new system, replacing them protects the bigger investment.
Is duct sealing worth it, or is replacement always better?
Sealing is genuinely effective when the duct material itself is sound — it's a fraction of replacement cost. When ducts are deteriorated, undersized, or badly routed, sealing is a band-aid. Our assessment tells you which side you're on.
Do bad ducts affect air quality?
Significantly. Return-side leaks pull unfiltered attic or crawlspace air — dust, fibers, humidity — straight into your system and your lungs. Sealing those leaks is one of the most effective air quality fixes there is.
Do you handle ductwork for both LA and Orange County?
Yes — duct testing, sealing, repair, redesign, and full replacement across all of Los Angeles County and Orange County, performed under CA C-20 license #1094200.
Need ductwork & duct replacement? Let's handle it.
Call (818) 817-6005 for 24/7 service across Los Angeles County and Orange County, or send the form and we'll call you back.
Call (818) 817-6005CA C-20 License #1094200 · 25years in business · Parts & labor guarantee
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