Residential Furnace Repair in Ontario, CA

Why Ontario Homeowners Choose #1 AC Guys

We are a family-owned HVAC company serving Ontario, CA with an engineering-first approach. Our team brings 80+ years of cumulative engineering experience and four generations of hands-on expertise to every residential furnace repair. That foundation means more accurate diagnostics, safer repairs, and heat that stays on.

• 4th‑generation family of engineers
• 80+ years of engineering expertise applied to HVAC
• Factory-trained at Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China)
• Fast, same‑day service for most Ontario neighborhoods
• Clear pricing and repair options before work begins
• Specialists in tough, complex heating problems

Signs Your Furnace Needs Repair

Don’t wait for a full breakdown. Call our Ontario team if you notice any of the following:

• No heat or only lukewarm air
• Short cycling or frequent resets
• Unusual sounds: banging, screeching, rattling
• Burning odors or persistent dust/smoke
• Cold and hot spots across rooms
• Rising utility bills without a weather change
• Thermostat not responding or inaccurate

If you smell gas or detect a potential leak, evacuate safely and contact emergency services before calling for service.

Our Residential Furnace Repair Process

Precision matters. We follow a structured diagnostic and repair workflow to restore heat quickly and safely:

• Deep Diagnostics: Electrical checks, airflow and static pressure readings, heat exchanger assessment, combustion safety, and control board testing.
• Root Cause Confirmation: We verify the actual failure—not just symptoms—to prevent repeat issues.
• Clear Options: You’ll get repair paths that balance reliability, efficiency, and budget, with transparent pricing.
• Factory‑Level Repair: We adhere to manufacturer procedures and local code requirements for a safe, long‑lasting fix.
• Performance Validation: Post-repair testing ensures proper temperature rise, airflow, and stable operation.

Engineering Advantage For Complex Issues

From intermittent ignition faults to chronic limit trips, our engineering background helps us solve the problems that basic parts swapping often misses. We address undersized ductwork, high static pressure, poor return air, venting issues, and control logic errors that can cause repeated failures—so your furnace runs the way it should.

Healthy Air, Healthy Home

Our mission is healthy air for healthy living. Every repair is an opportunity to improve indoor air quality and safety. We evaluate filtration, duct cleanliness, combustion safety, and ventilation to reduce dust, allergens, and combustion byproducts. If needed, we can recommend right-sized filtration upgrades and maintenance practices that protect your family and your furnace.

What We Service

• Gas and electric furnaces
• Packaged rooftop or ground units serving single-family homes and townhomes
• Hybrid heat systems integrating heat pumps with furnaces
• Zoned residential systems and advanced controls

Maintenance That Prevents Breakdowns

Regular tune-ups reduce emergency calls, lower energy use, and extend equipment life. Our preventative service inspects ignition and safety components, checks airflow and temperature rise, tests electrical connections, and verifies combustion safety—helping you avoid surprise failures on cold Ontario nights.

Factory Training You Can Trust

Our technicians have trained directly at manufacturer facilities: Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). This factory‑level exposure sharpens our diagnostic accuracy and installation standards while keeping us aligned with current best practices. It’s one more reason homeowners count on our team when repairs get complicated.

Proudly Serving Ontario, CA and Nearby

We provide residential furnace repair throughout Ontario, CA—covering neighborhoods from Ontario Ranch and Creekside to Downtown Ontario—and support nearby Inland Empire communities as part of our broader Southern California service area. We also serve Los Angeles County and nearby regions including Orange County, Ventura County, and Western Riverside County.

Transparent Pricing, Real Options

We respect your time and budget. After diagnosis, we present clear repair paths—whether that’s a targeted component replacement, airflow correction, or a more comprehensive fix—so you can choose with confidence. No surprises, just the right solution for your home.

Ready When You Need Us

Cold night, no heat? We’re ready. Book your Ontario furnace repair with #1 AC Guys and get the benefit of multi‑generation engineering expertise, factory‑trained technicians, and a healthy‑air mindset that puts your family first.

• Fast response in Ontario, CA
• Precision diagnostics and safe repairs
• Healthy air focus with every service
• Backed by 80+ years of engineering excellence

Your comfort is our craft. Let’s get your heat back—reliably.