Commercial Furnace Repair in Fullerton

Local Expertise for Fullerton Businesses

When your commercial furnace or rooftop unit fails, every hour matters. #1 AC Guys brings four generations of engineering know‑how to Fullerton, delivering accurate troubleshooting, safe repairs, and performance tuning that keeps tenants comfortable and operations on schedule. Our mission is simple: healthy air for a healthy life — and that means balanced heat, clean airflow, and dependable equipment.

What We Repair and Optimize

• Rooftop units (RTUs), packaged gas/electric systems, and make‑up air units
• Commercial gas and electric furnaces, heat exchangers, burners, and flues
• Ignition systems: hot surface igniters, spark ignition, flame sensors, gas valves
• Blower and inducer assemblies: motors, belts, bearings, pulleys, VFDs
• Safety and airflow controls: pressure switches, limit switches, economizers, dampers, actuators
• Filtration and IAQ: filters, coils, ventilation balance, and air quality upgrades
• Thermostats, zone controls, and building automation integrations

Our Commercial Repair Process

1. Rapid assessment: We start with a focused interview and a top‑to‑bottom operational check to isolate symptoms and site conditions.
2. Safety first: We verify gas train integrity, combustion air, venting, and safeties before advancing to fixes.
3. Root‑cause diagnostics: From combustion analysis to electrical testing, we confirm the true cause — not just the obvious failure point.
4. Clear options: You receive documented findings, photos where helpful, and repair options that prioritize reliability, IAQ, and energy performance.
5. Precision repair and tune: We replace failed components, recalibrate controls, optimize airflow, and verify stable, efficient operation.

Engineers Trained by Leading Manufacturers

Our team has factory training experience with Fujitsu, Mitsubishi Electric, Midea, Gree, and Haier. That cross‑platform knowledge helps us service diverse equipment lineups commonly found across Fullerton’s offices, retail spaces, restaurants, light industrial facilities, and multifamily communities.

Healthier Air, Better Comfort, Lower Costs

Heat reliability and indoor air quality go hand in hand. We correct airflow imbalances, address burner efficiency, and advise on filtration and ventilation improvements so occupants feel comfortable and productive — often with lower energy spend and fewer callbacks.

Industries We Serve

• Office and campus environments
• Retail, restaurants, and hospitality
• Warehouses, light manufacturing, and flex spaces
• Healthcare suites and professional services
• Multifamily common areas and HOA facilities

Why Fullerton Chooses #1 AC Guys

• 4th‑generation family business with 80+ years of engineering experience
• Specialists in large and complex commercial systems
• Factory‑trained on multiple global brands for mixed‑fleet sites
• Root‑cause diagnostics that reduce repeat failures
• Clear communication, organized workflows, and professional documentation

Service Area

Based in Los Angeles, we proudly serve Fullerton and the wider Orange County market, with coverage across Los Angeles County and nearby regions including Ventura County and Western Riverside County. If you operate across multiple sites, we can coordinate repairs to minimize disruption.

Book Your Commercial Furnace Repair in Fullerton

Restore heat, protect your equipment, and improve indoor air with a team built on four generations of engineering. Contact #1 AC Guys to schedule commercial furnace repair in Fullerton or request a detailed quote today.