Orange County service area
HVAC Services in Fullerton, CA
Fullerton's leafy historic neighborhoods — Golden Hill, Raymond Hills, the craftsman streets near downtown — hold some of north Orange County's most character-rich housing. United Heating & Air Conditioning has served these homes, and the city's newer hillside tracts, for 25 years.
- 25 Years in Business
- 24/7 Emergency Service
- CA C-20 License #1094200
- Parts & Labor Guarantee
- Lifetime Guarantee
- Discounts Available
A contractor that knows Fullerton
North OC summers run hotter than the coast, and Fullerton's older homes often cool with aging or improvised equipment. We bring these houses up to modern comfort without sacrificing what makes them special.
Local insight
Fullerton's pre-war neighborhoods often hide decades of patchwork HVAC — a wall heater here, a window unit there. We design coherent whole-home systems for these houses, frequently the first proper HVAC they've ever had.
Why Fullerton calls United Heating & Air Conditioning
- 25 years serving LA & Orange County
- Licensed C-20 HVAC contractor
- 24/7 emergency response
- Parts & labor guarantee
- Lifetime guarantee on installations
- Discounts available — ask when you call
Licensed C-20 work in Fullerton — honest recommendations, guaranteed results, since 2001.
HVAC services available in Fullerton
HVAC Emergency in Fullerton?
No heat. No cooling. No waiting until morning.
We answer 24 hours a day, 7 days a week — nights, weekends, and holidays — across Fullerton and all of Los Angeles County and Orange County.
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
HVAC in Fullerton — common questions
Can you design a complete system for an older Fullerton home with no central HVAC?
Yes — it's one of our favorite project types. Depending on the home's construction, that's a ducted central system, a multi-zone ductless design, or a hybrid — engineered for the house rather than forced into it.
Do you serve the hillside neighborhoods in north Fullerton?
Yes — including Raymond Hills and Sunny Hills, where larger lots and two-story homes typically run bigger or dual systems that we service and replace routinely.
Need HVAC service in Fullerton?
Call (818) 817-6005 — 24/7, including emergencies — or send the form and we'll get back to you fast.
Call (818) 817-6005CA C-20 License #1094200 · 25years in business · Parts & labor guarantee
Request service online
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