Fast, Reliable Heating & Furnace Across Ontario
Furnace repair in Ontario typically runs $150–$700, replacement runs $3,500–$7,500, and most calls in the 91762, 91764, and 91761 ZIP codes get same-day or next-day response. We’re Redwood Heating & Air, and our Heating & Furnace team makes the drive from San Diego to Ontario regularly for jobs that need a Master Technician’s eye, not a flat-rate parts-swapper. Gregory Hahn founded this company and still leads every technical decision. Thirteen years and 428+ reviews averaging 4.6 stars later, we’ve learned that Ontario’s furnace problems aren’t generic. They’re specific to 1960s tract homes with original equipment, or to Ontario Ranch’s new modulating systems that confuse technicians trained on single-stage units. Call (844) 875-9451 for a free estimate.
Why Redwood Heating & Air San Diego Is Ontario’s Preferred Heating & Furnace Company
We’ve built our reputation on diagnosing right the first time, and that’s especially critical in Ontario where two completely different housing eras sit side by side. Our 428+ verified customer reviews at 4.6 stars include plenty from Inland Empire homeowners who were tired of callbacks.
Gregory Hahn holds a Master Technician designation, and he’s on the truck, not in a corporate office. That means owner-level accountability on every Ontario job, whether we’re working on a 1972 Lennox in the 91764 tract near Mission Boulevard or a modulating Daikin in a 2021 Ontario Ranch build off Edison Avenue.
Response time to Ontario is typically same-day for emergency calls and next-day for standard scheduling. We know the difference between a furnace that needs a $200 ignitor and one with a cracked heat exchanger leaking carbon monoxide. That knowledge saves Ontario homeowners from the dangerous guesswork of patching old equipment that should have been retired years ago.
Our 13 years in business outlasts most local HVAC startups. We’ve seen enough to know that a technician who only knows Carrier can’t properly diagnose a Trane two-stage system, and someone who only swaps gas valves won’t catch an oversized furnace short-cycling itself to death.
Our Heating & Furnace Services in Ontario
Furnace Repair
Ontario furnace repair calls spike hardest in January when nighttime temps drop into the 30s and homeowners discover their heater failed during the first cold snap. In the older 91762 and 91764 neighborhoods, we see a lot of intermittent lockouts caused by flame sensors fouled with Chino Basin mineral deposits. The hard water here corrodes gas valves and degrades ignitors faster than coastal technicians expect. A typical furnace repair in Ontario runs $150–$700 depending on whether we’re cleaning a sensor, replacing a gas valve, or tracking down a control board failure in a 40-year-old unit with obsolete parts.
Furnace Replacement
Replacement becomes the right call when repair costs exceed 40% of a new system’s value, or when safety is compromised. In Ontario’s 1960s–1980s tracts, we regularly find furnaces that are dramatically oversized for today’s improved insulation. A 120,000 BTU beast in a 1,400 square foot ranch short-cycles itself to death, cracks its heat exchanger from thermal stress, and delivers uneven heat. We size replacements properly using Manual J load calculations, not rule-of-thumb square footage guesses. Furnace replacement in Ontario typically costs $3,500–$7,500 including proper duct sealing and thermostat upgrade.
Furnace Tune-Up
An Ontario furnace tune-up runs $80–$200 and should happen every fall before the heating season. We focus on combustion analysis, heat exchanger inspection with a borescope, and gas pressure verification. In Ontario specifically, we also clear condensate drains that clog from mineral buildup and check attic ductwork for collapse in those 150°F summer attics. A tune-up catches cracked heat exchangers before they leak CO into your home. It’s cheap insurance.
Heat Exchanger Inspection & Replacement
This is our most critical safety service in Ontario. Cracked heat exchangers leak carbon monoxide, and in the older neighborhoods we find them constantly. At a 1968 ranch-style home near Euclid Avenue and Riverside Drive in 91762, we found a Carrier gas furnace with a cracked heat exchanger that was leaking CO at 50 ppm. The homeowner had patched the ignitor twice but the original 120,000 BTU unit was oversized for the house. We retrofitted a properly sized 80,000 BTU Goodman two-stage furnace, sealed the uninsulated attic ducts with mastic, and installed a smart thermostat. Heat is now even across all rooms and the gas bill dropped 30%. Heat exchanger replacement alone runs $800–$2,200, but we always evaluate whether replacement of the entire furnace makes more sense.
Gas Valve Repair & Ignitor Replacement
Gas valve failure and ignitor problems are epidemic in Ontario due to that Chino Basin hard water. Mineral deposits foul flame sensors, corrode valve seats, and cause intermittent operation that drives homeowners crazy. A gas valve repair or replacement typically falls in the $250–$600 range of our overall repair pricing. We stock common valves for Carrier, Bryant, and American Standard systems to minimize wait times for Ontario customers.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Ontario
We service your brand. Gregory Hahn and our technicians are factory-trained or experienced across nine major HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. That matters enormously in Ontario Ranch, where many homeowners are on their very first service call with complex inverter-driven or modulating equipment. A flat-rate tech used to swapping single-stage equipment in older Ontario neighborhoods will be out of their depth two miles east on the same shift. We carry common parts for Carrier, Bryant, and American Standard systems on our trucks, which means faster turnaround for Ontario customers and fewer return trips.
Common Heating & Furnace Problems We See in Ontario Homes
- Heat exchanger cracking from thermal stress in older furnaces that short-cycle due to oversizing. The 1960s–1980s tract homes in 91762 and 91764 were built with massive furnaces that blast heat for five minutes, shut off, and repeat. That thermal cycling fatigues the heat exchanger steel until it cracks, leaking CO into the ductwork.
- Gas valve or ignitor failure after hard water corrosion. Chino Basin mineral deposits foul flame sensors and gas valves, causing intermittent lockouts that seem random until a technician knows to test water hardness and check for scale buildup on the burner assembly.
- Ductwork collapse or severe leakage in uninsulated attics exceeding 150°F. The original flex duct in Ontario’s older homes turns to dust after decades in those attics. Insufficient airflow causes the furnace to overheat and shut down on high limit, which homeowners interpret as “the furnace keeps breaking” when it’s actually the ducts.
- Modulating furnace shutdowns in Ontario Ranch. Newer 91761 homes have complex two-stage or modulating furnaces with variable-speed blowers. When these systems throw error codes, technicians without brand-specific training replace perfectly good parts while missing the actual diagnostic. We’ve rescued more than one Ontario Ranch homeowner from a string of failed repair attempts.
Pricing for Heating & Furnace in Ontario, CA
We’re upfront about what things cost because nobody likes surprises when their heat is out.
| Service | Price Range in Ontario |
|---|---|
| Furnace Repair | $150–$700 |
| Furnace Replacement | $3,500–$7,500 |
| Furnace Tune-Up | $80–$200 |
What moves the needle within these ranges? Parts availability for obsolete equipment, accessibility of attic ductwork, and whether we discover safety issues like a cracked heat exchanger that change the repair-versus-replace math. Ontario’s hard water and extreme summer attic temperatures mean we often find secondary problems once we’re inside the system. We diagnose before we quote, and estimates are always free. Call (844) 875-9451.
We Also Serve Cities Near Ontario
Our Heating & Furnace coverage extends throughout the western Inland Empire. We regularly service Montclair, Upland, Chino, and Claremont with the same Master Technician-led response that Ontario homeowners get. The housing stock and climate challenges are similar across these cities, and we know the local building eras, permit offices, and common failure modes.
Serving Ontario, CA — Our Local Coverage Area
We’re based in the Ontario area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs — Heating & Furnace in Ontario
Usually yes, but it depends on whether the root cause is a $200 ignitor or a cracked heat exchanger leaking CO. In 91762 and 91764, we see plenty of repairable ignition failures caused by Chino Basin hard water fouling the flame sensor. If the heat exchanger is cracked, replacement is the only safe option. Call (844) 875-9451 and we’ll diagnose it properly — estimates are free.
Yes, the City of Ontario requires a permit for furnace replacement to ensure compliance with current safety codes and Title 24 efficiency standards. We handle permit pulling as part of our replacement service, including the required Title 24 compliance documentation for Ontario Ranch’s newer construction. The permit process typically adds 2–3 business days to the timeline.
Most likely it’s short-cycling due to an oversized unit, restricted airflow from undersized ducts, or a control issue with the modulating gas valve. Ontario Ranch homes have complex inverter-driven or two-stage systems that require manufacturer-specific diagnostics. A technician trained only on single-stage equipment often misdiagnoses these as simple part failures. We service your brand with the right training and tools.
Replace it if the repair exceeds 40% of replacement cost, if the heat exchanger is cracked, or if the unit is oversized and short-cycling. In Ontario’s 1960s–1980s tracts, oversizing is so common that we often recommend replacement solely for the efficiency and comfort gains of proper sizing. A right-sized modern furnace can cut gas bills 25–35%. Call (844) 875-9451 for an exact quote on both options.
Telltale signs: it heats the house in under 10 minutes then shuts off, rooms near the thermostat are hot while distant rooms are cold, and you’ve had repeated heat exchanger or high-limit failures. In 91762 and 91764, original furnaces were routinely spec’d at 120,000+ BTU for homes that need 60,000–80,000 with modern insulation. We verify with a Manual J load calculation before any replacement.
Ready to get your Ontario home’s heat fixed right? Call Redwood Heating & Air at (844) 875-9451 for a free estimate. Gregory Hahn or one of our Master Technician-trained team will diagnose your system and give you honest options — repair or replace, with real numbers and no pressure.
Written by Gregory Hahn, Owner at Redwood Heating & Air, serving Ontario and the Inland Empire since 2011.