20% Todays special Deal in your city
Fullerton, CA
20% Todays special Deal in your city
+1 213 205 21 43
Keep your building warm and your operation moving with #1 AC Guys — Fullerton’s commercial boiler re...
95% of clients recommend us
We offer a wide range of HVAC services catered to both residential and commercial clients. Even the all-powerful Pointing has no control about the blind texts.
When your business depends on reliable heat and hot water, you need a commercial boiler expert who solves the root cause, not just the symptom. #1 AC Guys is a fourth‑generation family company with 80+ years of engineering experience, serving Fullerton and Orange County with rapid diagnostics, code‑compliant repairs, and meticulous documentation. We handle hot water and steam boilers, pumps, expansion tanks, burners, gas valves, low‑water cutoffs, heat exchangers, and advanced controls. Expect clean workmanship, transparent pricing, parts‑and‑labor warranties, and 24/7 emergency support. Our mission is healthy, comfortable indoor environments and dependable operation for every square foot you manage. From small retail spaces to large campuses and industrial sites, we restore performance, extend equipment life, and lower operating costs—safely and efficiently.
As a family‑run HVAC engineering team in our fourth generation, #1 AC Guys brings deep technical discipline to commercial boiler repair across Fullerton and Orange County. We combine advanced diagnostics with code knowledge and manufacturer best practices to stabilize systems fast, prevent repeat failures, and optimize lifecycle costs.
Common issues we resolve include short‑cycling, nuisance lockouts, poor heat balance, loss of pressure, noisy operation, rising fuel use, combustion problems, and leaks. Our field engineers deliver clear root‑cause reports and recommendations you can act on with confidence.
We start with a structured diagnostic: verify safeties, combustion, and gas supply; inspect venting and makeup air; assess pumps and flow; check water chemistry; and test controls. You receive a detailed, line‑item estimate before work begins. Most critical repairs are completed same day, and we stage OEM or high‑grade parts to minimize downtime.
Planned maintenance reduces fuel consumption, extends equipment life, and cuts emergency calls. Our PM programs include seasonal start‑ups, annual combustion tuning, gasket and seal checks, pump alignment, strainer cleaning, water treatment tracking, and safety device testing. We tailor visit frequency to your runtime, occupancy, and equipment age.
Heat or hot water down? Our Fullerton‑based dispatch prioritizes critical facilities and revenue‑impacting outages. Technicians arrive with stocked service vehicles, calibrated analyzers, and the parts most buildings require. We communicate clear ETAs and keep you informed at every step.
We follow California Title 24 energy requirements and applicable standards such as ASME and NFPA 54 for gas‑fired equipment. Expect organized job files: photos, readings, combustion reports, parts lists, and recommendations that make budgeting and compliance easier.
Our engineers were factory‑trained by Fujitsu (Japan), Mitsubishi Elektrik (Thailand), Midea (China), Gree (China), and Hier (China). That discipline in controls, thermodynamics, and system integration informs how we approach commercial boiler rooms, large hydronic plants, and mixed‑use facilities. We specialize in complex, multi‑zone, and large‑capacity systems where precise sequencing and commissioning matter most.
When repair is not the best investment, we provide like‑for‑like swap‑outs and engineered retrofits. Options include high‑efficiency condensing boilers, variable primary pumping, O2 trim, advanced sequencing, and BMS integrations that cut fuel waste and stabilize comfort. We deliver turnkey project management: permits, crane and rigging, startup, and commissioning.
If you notice any of the above, schedule a diagnostic before a minor issue becomes a shutdown.
We proudly serve Fullerton, Anaheim, Brea, Placentia, Buena Park, La Habra, and the broader Orange County area. As a Southern California company, our service area also covers Los Angeles County, Ventura County, and Western Riverside County for multi‑site clients.
Get trusted commercial boiler repair in Fullerton from engineers who treat your mechanical room with the precision it deserves. Contact #1 AC Guys to schedule service, request a quote, or set up a preventive maintenance plan that protects your budget and your building.
Ready when you are — same‑day service and 24/7 emergency response available.
We offer a wide range of HVAC services catered to both residential and commercial clients. Even the all-powerful Pointing has no control about the blind texts.
We offer a wide range of HVAC services catered to both residential and commercial clients.
We offer a wide range of HVAC services catered to both residential and commercial clients.
