Commercial Furnace Repair in Fontana, CA

Why Fontana Businesses Choose #1 AC Guys

As a family business now in our fourth generation, #1 AC Guys brings more than 80 years of engineering depth to every commercial furnace repair. We’re known across Southern California for tackling large, complex projects without cutting corners. Our mission is simple: healthy air for a healthy life—delivered with craftsmanship, safety, and integrity.

Expert Repair for Complex Commercial Heating

Your facility needs heat that’s reliable, efficient, and safe. Our engineers diagnose and repair a full range of commercial systems: gas furnaces, rooftop packaged units (RTUs), make‑up air units, unit heaters, and hybrid/heat‑pump heating where applicable. We follow a structured process—root‑cause diagnostics, transparent options, code‑compliant repairs, and post‑repair performance verification—so your heating is restored quickly and correctly.

• Rooftop units (single and multi‑stage)
• High‑efficiency gas furnaces and condensing systems
• Make‑up air and ventilation‑integrated heating
• Unit heaters for warehouses and loading docks
• Controls, economizers, and safeties

Brand Training That Matters

Our team has trained directly with leading manufacturers, including Fujitsu (Japan), Mitsubishi Electric, Midea (China), Gree (China), and Haier (China). This means we understand factory specifications, proper parts sourcing, and the nuances that keep your systems safe, efficient, and durable. We service mixed-brand sites and legacy equipment with the same detail‑driven approach.

Industries We Serve in and around Fontana

We support warehouses, logistics, and light manufacturing common to the Fontana area, as well as office parks, retail centers, medical and dental, education, hospitality, and property management portfolios. Our service is available across Fontana and nearby Inland Empire communities, with extended regional coverage throughout Los Angeles County and neighboring Orange County, Ventura County, and Western Riverside County.

Signs Your Commercial Furnace Needs Service

• Uneven heating, cold spots, or frequent cycling
• Rising gas or electric bills without operational changes
• Unusual noises, odors, or visible burner/heat‑exchanger issues
• Poor ventilation or IAQ complaints from staff and customers
• Heating alarms or fault codes on building controls

If you notice any of these, our rapid‑response team can inspect, test, and restore performance before minor issues escalate into costly downtime.

Our Commercial Repair Process

1. Discovery and Safety Check: We start with safety, lock‑out/tag‑out, combustion and CO checks, and visual inspection.
2. Root‑Cause Diagnostics: Combustion analysis, airflow verification, gas pressure, ignition and control tests.
3. Clear Options & Pricing: You’ll receive transparent recommendations focused on reliability, energy savings, and compliance.
4. Code‑Compliant Repair: OEM‑grade parts, precise installation, and calibrations to manufacturer specs.
5. Performance Verification: Post‑repair testing, documentation, and maintenance guidance to prevent repeat issues.

Healthy Air, Safer Workplaces

Comfort is just the beginning. We prioritize indoor air quality with proper combustion setup, ventilation balance, filtration strategies, and control sequences. Our repairs and tune‑ups help reduce pollutants, protect heat exchangers, and support wellness—because clean, properly warmed air is essential to productivity and safety.

Proactive Maintenance & Lifecycle Planning

Protect your investment with a tailored maintenance plan. We schedule seasonal tune‑ups, filter management, belt and bearing care, burner cleaning, heat‑exchanger inspections, and control testing. You’ll receive actionable reports, budget forecasts, and replacement roadmaps for aging assets—minimizing surprises and extending equipment life.

What Sets #1 AC Guys Apart

• 4th‑generation, family‑owned—stable, accountable, and local
• 80+ years of engineering know‑how for complex systems
• Factory‑trained on leading global brands
• Rapid response, honest pricing, and clear communication
• Code‑compliant work aligned with California standards

Ready to Restore Reliable Heat?

If your Fontana facility needs dependable commercial furnace repair, partner with the team that treats your building like our own. Contact #1 AC Guys to schedule diagnostics today. We’ll stabilize your heating quickly, optimize performance, and help you keep healthy air moving—so your business can keep moving, too.