Licensed C-20 AC Installation
AC Installation & Replacement in Los Angeles & Orange County
A new air conditioning system is one of the biggest comfort investments you'll make in your home — and the quality of the installation matters as much as the equipment itself. An incorrectly sized or poorly installed system costs more to run, cools unevenly, and fails years early.
- 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 AC installation
United Heating & Air Conditioning has installed and replaced AC systems across Los Angeles County and Orange County for 25 years. We size every system to your home with a proper load calculation, install it to manufacturer specification, and stand behind the work with our lifetime guarantee.
Right-sized, not oversold
We calculate what your home actually needs based on square footage, insulation, sun exposure, and ductwork — and recommend the system that fits, not the most expensive one on the truck.
Licensed C-20 installation
Installation by a CA State licensed Warm-Air HVAC contractor (C-20 #1094200), with permits and code compliance handled properly.
Lifetime guarantee on our work
We stand behind our installations with a lifetime guarantee — a level of accountability most contractors won't put in writing.
Efficiency that pays you back
Modern high-SEER2 systems can meaningfully cut cooling costs versus a 10–15 year old unit, especially through LA and OC summers.
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 AC installation
AC Installation is available across both counties — every city, every neighborhood, 24/7 for emergencies.
Popular service areas
AC Installation — common questions
How do I know what size AC my home needs?
We perform a load calculation that accounts for your home's square footage, layout, insulation, windows, and sun exposure. Oversized systems short-cycle and undersized systems never catch up — correct sizing is the foundation of a good installation.
Do you handle permits for AC installation?
Yes. As a licensed C-20 contractor we handle the permit and code-compliance side of the installation properly, in both Los Angeles County and Orange County jurisdictions.
Do you install ductless mini-split systems?
Yes. We install central systems, heat pumps, and ductless mini-splits — a great option for homes without ductwork, additions, ADUs, and garages.
Is your installation work guaranteed?
Yes. Our installations are backed by a lifetime guarantee on our workmanship, in addition to the manufacturer's equipment warranty.
Do you offer discounts on new systems?
Discounts are available — ask when you call. We'll also point out any current manufacturer or utility rebates that apply to your installation.
Need AC installation? 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
Request service online
Takes 30 seconds. We respond fast — 24/7.