Commercial Boiler Repair in Downey, CA

Our Commercial Boiler Expertise

#1 AC Guys delivers precision commercial boiler repair in Downey for hot‑water and steam systems—atmospheric, power‑burner, and condensing units. We service single and multi‑boiler plants with lead/lag controls, primary–secondary piping, variable flow, and heat‑exchanger loops, whether your equipment is on the roof or in a tight mechanical room.

• Emergency no‑heat response and same‑day stabilization
• Combustion analysis, tuning, and efficiency optimization
• Burner, ignition, and flame‑safeguard troubleshooting
• Gas‑train repairs (regulators, valves, pilots, leak checks)
• Heat‑exchanger tube cleaning and descaling
• Pumps, motors, and VFD service and replacement
• Expansion tanks, air separators, and air‑vent service
• Relief valves, PRVs, and backflow prevention
• Controls repair, sensors, thermostats, and BAS/BMS integration
• Low‑NOx retrofits and compliance support
• Water treatment, corrosion control, and glycol management
• Piping, valve, and insulation repairs
• Right‑sized boiler replacement when repair is not economical

Step‑by‑Step Diagnostic Process

We use an engineering‑first workflow to minimize downtime and prevent repeat failures:

• Intake and safety check: verify lockouts, alarms, gas supply, venting, and combustion air
• Root‑cause diagnostics: measure draft, CO/CO2, O2, manifold pressure, and stack temperature
• Hydronic balance: inspect pumps, strainers, flow, delta‑T, expansion, and air elimination
• Controls review: test safeties, staging, lead/lag, setpoints, and BMS communication
• Repair and validation: install parts, retest combustion, document results, and confirm code compliance

Thanks to local supply access, including AC PRO, we source OEM‑grade components quickly to restore heat and hot water without long delays.

Compliance, Safety, and Documentation

Our team follows Los Angeles County codes, manufacturer specifications, and SCAQMD guidelines for low‑NOx and clean combustion. We verify vent sizing and clearances, relief‑valve capacity, seismic bracing, combustion air, and gas pressure. After repairs, you receive a clear report with readings, photos, and recommendations to support audits and insurance requirements.

Safety matters most. We isolate equipment, use calibrated combustion analyzers, and verify CO at the appliance and in the space before turnover. Where permitting is needed, we coordinate with your facility team to keep projects moving.

Proactive Maintenance Plans

Preventive care extends equipment life and stabilizes operating costs. Our seasonal programs include burner cleaning, filter and strainer service, water‑quality testing, glycol concentration checks, operational testing under load, and setpoint optimization. We flag failing components before they cause downtime and deliver an annual action plan that aligns with budget cycles.

• Seasonal start‑ups and shutdowns
• Combustion recheck and tuning
• Water treatment oversight and vendor coordination
• Safety device testing and documentation
• Energy‑efficiency recommendations with ROI

Industries We Serve in Downey

We support offices, retail centers, restaurants, healthcare and labs, schools, manufacturing, logistics and warehouses, hospitality, and multifamily/HOA common areas. Whether you manage a single site or a multi‑property portfolio, we tailor SLAs, communication, and reporting to your standards.

Transparent Pricing and Warranty

Expect clear estimates, approvals before work, and options that fit your risk and budget. We back repairs with strong workmanship warranties, and when parts are needed, we leverage local distributors—such as AC PRO—for fast, OEM‑grade components. That means fewer return visits and a smoother close‑out.

Our Engineering Heritage

We are a 4th‑generation family of engineers with 80+ years in engineering. Our team trained on factory floors at Fujitsu (Japan), Mitsubishi Elektrik (Thailand), Midea (China), Gree (China), and Hier (China), bringing disciplined methodology, quality control, and attention to detail to every commercial boiler project. We thrive on large and complex assignments that demand precise diagnostics, tight coordination, and code‑compliant execution.

Our mission is healthy air in your building for a healthier life. Efficient boilers reduce emissions, stabilize indoor comfort, and protect your bottom line—benefits your occupants feel every day.

Service Area

Based in Los Angeles, we serve Downey and all of Los Angeles County, as well as nearby Orange County, Ventura County, and Western Riverside County. Dispatch is available 24/7 for critical commercial boiler issues.

Ready to Schedule?

Need fast, reliable commercial boiler repair in Downey? Call #1 AC Guys or request service online. We’ll diagnose the issue, present clear options, and get your heat and hot water back online—safely, efficiently, and on budget.
When the job is complex, engineers make the difference. Put our 80+ years of engineering experience to work for your building today.