Commercial Boiler Repair in Fullerton, CA

Engineered Commercial Boiler Repair for Fullerton Buildings

#1 AC Guys specializes in commercial boiler repair that keeps your operation running. From condensing hydronic boilers to non‑condensing and low‑pressure steam, we combine precision diagnostics with practical repairs aimed at uptime, safety, and energy performance. Our mission is healthy, comfortable buildings—and that starts with reliable heat and clean, safe combustion.

Industries and Facilities We Serve

• Office and mixed‑use high‑rises
• Hospitals, clinics, and labs
• Schools, universities, and campuses
• Hotels, hospitality, and event venues
• Manufacturing, warehouses, and light industrial
• Retail centers and restaurants
• Houses of worship and community facilities
• Multifamily and HOA common areas

What We Repair and Optimize

• Burners, gas trains, valves, regulators, and ignition systems
• Pumps, VFDs, air separators, and expansion tanks
• Heat exchangers, condensing sections, and flue/venting
• Combustion controls, BAS integration, sensors, and safeties
• Water quality and treatment to prevent scaling and corrosion
• Leaks, pressure issues, kettling, and lockout faults
• Balancing, air elimination, and distribution performance

Fast Diagnosis, Clear Pricing, Code Compliance

We start with a structured diagnostic: visual inspection, combustion analysis, flue draft checks, loop pressures, delta‑T, and control logic review. You get a concise report with findings, options, and transparent pricing before work proceeds. Repairs are performed to manufacturer specifications and local codes (including California energy standards and regional air‑quality requirements). Our safety protocol includes gas leak checks, CO verification, and operational testing prior to turnover.

AC PRO Parts Availability

Downtime costs money. We maintain rapid access to replacement components and consumables, including AC PRO‑supplied parts and materials, to help speed repairs and maintenance. This AC PRO parts availability supports faster turnarounds across boilers, hydronic accessories, and control peripherals while maintaining OEM‑level performance requirements.

Preventive Maintenance and Tune‑Ups

• Seasonal start‑ups and shut‑downs with safety checks
• Combustion tuning for efficiency and emissions
• Gasket, trap, and seal inspection/replacement
• Water chemistry testing, treatment, and descaling
• Sensor calibration, control optimization, and BAS checks
• Pump alignment, bearing checks, and flow verification

A well‑planned PM program reduces emergency calls, extends equipment life, stabilizes utility spend, and protects occupants and operations. Ask about custom maintenance agreements for Fullerton campuses and multi‑site portfolios.

Upgrades and Retrofits

• High‑efficiency boiler replacements and right‑sizing
• Controls modernization, lead/lag, and O2 trim
• Pump retrofits with VFDs and smart control
• Heat exchanger replacements and venting improvements
• Energy recoveries and hydronic balancing

Our engineering‑first approach helps identify ROI‑positive retrofits that cut fuel use and improve resiliency. We prioritize low‑disruption projects with clear timelines and commissioning documentation.

Signs You Need Commercial Boiler Service

• Rising gas bills or declining efficiency
• Frequent lockouts, nuisance alarms, or hard starts
• Uneven heating, cold zones, or slow warm‑up
• Leaks, corrosion, or unusual odors
• Kettling, banging, or whistling noises
• Visible flue/vent issues or soot accumulation
• CO alarms or draft problems

Our Credentials and Training

We are a family business in Southern California—now in our 4th generation—with 80+ years of engineering experience. Our engineers carry factory training from Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). Combined with deep hydronic expertise, controls knowledge, and large‑project execution, we bring the rigor of engineering to every commercial boiler repair.

Service Area and Response

Based in the Greater Los Angeles region, we serve Fullerton and nearby areas across Orange County, Los Angeles County, Ventura County, and Western Riverside County. Priority and emergency dispatch are available to minimize downtime, protect occupants, and keep critical operations online.

What to Expect

• Rapid assessment and a clear repair plan
• Options that balance cost, reliability, and energy performance
• AC PRO parts availability to accelerate turnaround
• Detailed testing, startup, and verification
• Post‑repair report with recommendations to prevent repeat issues

Ready to Restore Reliable Heat?

If your Fullerton facility needs commercial boiler repair, maintenance, or an efficiency retrofit, #1 AC Guys is ready to help. Contact us to schedule diagnostics or request emergency service. We solve complex problems, deliver dependable results, and keep your building safe, warm, and efficient—today and season after season.