Furnace Maintenance in Ontario, CA

Why Ontario, CA Chooses #1 AC Guys

As a 4th‑generation, family‑owned HVAC company with 80+ years of engineering experience, #1 AC Guys brings proven craftsmanship to every furnace maintenance visit in Ontario, California. Our engineers are factory‑trained by Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China), and we service all major brands, including Trane, Carrier, Lennox, Rheem, York, and Goodman. We specialize in both residential and commercial systems—from standard gas furnaces to multi‑zone and rooftop units—especially large and complex projects.

Our mission is healthy air at home for a healthy life. That means we don’t just tune your furnace—we optimize comfort, safety, and air quality for the people and spaces you care about.

Benefits of Professional Furnace Maintenance

• Lower energy bills: A clean, calibrated system runs more efficiently.
• Fewer breakdowns: We catch small issues before they become costly repairs.
• Longer equipment life: Reduced wear and proper lubrication extend service life.
• Safer operation: Combustion checks, gas pressure verification, and CO testing add peace of mind.
• Cleaner indoor air: Filter and airflow optimization help reduce dust and allergens.
• Warranty compliance: Regular maintenance helps keep manufacturer warranties valid.

What Our Furnace Tune‑Up Includes

We follow a meticulous checklist tailored to Ontario’s climate and California codes:

• Thermostat testing and calibration
• Air filter inspection and replacement options
• Blower assembly cleaning and motor amp draw measurement
• Burner and ignition system cleaning (pilot, hot surface, or spark ignition)
• Heat exchanger visual inspection for cracks or corrosion
• Gas pressure and combustion analysis; CO and draft safety checks
• Electrical connections tightening; capacitors and controls testing
• Flue/vent inspection for proper draft and code compliance
• Condensate drain check on high‑efficiency furnaces
• Static pressure and airflow assessment to protect equipment and ducts
• Ductwork visual inspection for leaks or restrictions
• Cycle test to verify reliable starts, steady operation, and proper shutdown

Residential and Commercial Expertise

From Ontario Ranch and Creekside to Downtown Ontario and College Park—single‑family homes, apartments, and HOA communities trust us to keep heat steady and safe. For businesses, we maintain rooftop package units, multi‑zone systems, and complex controls to minimize downtime and improve occupant comfort.

Large and Complex Projects—Handled

Have a challenging layout, high‑capacity furnace, or integrated ventilation and IAQ upgrades? Our engineers love solving complex problems, from balancing airflow in multi‑story spaces to coordinating furnace operation with advanced filtration, humidification, or energy recovery systems.

Indoor Air Quality Upgrades

Because healthier air matters, we offer options that fit your goals and budget: high‑MERV or HEPA‑grade filtration, sealed ducts, UV treatment, and smart ventilation strategies. We’ll explain pros and cons so you can decide with confidence—no pressure.

How Often Should You Schedule Maintenance?

We recommend an annual tune‑up before the heating season, or biannual service for high‑use or commercial systems. Book earlier if you notice warning signs like higher bills, uneven heat, short cycling, unusual noises or odors, frequent resets, or a yellow furnace flame.

Service Area

We proudly serve Ontario, CA and nearby communities across Los Angeles County and adjacent areas, including Orange County, Ventura County, and Western Riverside County. Close neighbors such as Upland, Rancho Cucamonga, Chino, Chino Hills, and Eastvale are within easy reach—ask about availability in your exact location.

Transparent Pricing, Licensed & Insured

Expect straightforward pricing, clear communication, and work performed to California codes by fully licensed and insured professionals. We provide photo/video findings when helpful and only recommend what your system truly needs.

Schedule Your Furnace Maintenance in Ontario, CA

Get ahead of the cold with a precision tune‑up from #1 AC Guys. Enjoy higher efficiency, safer heat, cleaner air, and a system you can trust when it matters most. Contact us today for same/next‑day appointments and experience the care and quality a 4th‑generation team brings to every job.

#1 AC Guys — Healthy air at home for a healthy life.