Furnace & heating
AC repair
Heat pumps
Ductless mini splits
Carrier
Trane
GoodmanSeasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Get your free estimateFast, Reliable Furnace Repair Across Cupertino
When your furnace quits on a cold Cupertino night, you need someone who knows the difference between a quick ignitor fix and a heat exchanger that’s quietly rusting through. Most furnace repairs here run $150 – $700, and depending on when you call, we can often have a technician at your door the same day. The houses in Cupertino are mostly 1960s through 1990s single-family builds with attic-mounted gas furnaces, and we have worked on enough of them to know exactly what fails and when. Call (669) 800-4179 and a live person answers, any hour, any day. No phone tree, no “leave a message and we’ll get back to you.”
Why Cold Harbour Heating and Air San Jose Is Cupertino’s Preferred Furnace Repair Company
We are the independently operated face of the Kingswell Guarantee, which means four promises get written down before we touch a single tool: a firm price, a firm arrival window, a clean job site, and a 365-day repair guarantee. Our Furnace Repair team includes background-checked, uniformed technicians trained on nine major brands, including Trane, Lennox, Goodman, and Rheem. When we say we’ll be there between 9 and 11, we mean it. Cupertino homeowners have been let down before by no-shows and prices that jumped at the door. Our job is to be the company that finally does what it says it will do, in writing, every time.
We were founded in 2003 as part of the Kingswell network of independently owned and operated HVAC businesses, and Victor Mancini runs our operation. The Kingswell Way boils down to five values we actually follow: say the price before the work, show up in the window given, leave the place cleaner than found, put the guarantee in writing, and come back if it fails. That last one is the 365-Day Done Right Promise. If a repair fails within a full year, we return and correct it at no charge. Not a prorated credit. Not a “we’ll take a look.” A free second visit and a fixed furnace.
Styles & brands we work with
Gas Furnace Repair in Cupertino
Gas Furnace Repair in Cupertino usually means one of three things: an ignitor that won’t light, a gas valve that won’t open, or a blower motor running loud and weak. We also see plenty of older Rheem and Carrier units from the 1980s with heat exchangers that have started to crack, which is a carbon monoxide concern that requires immediate attention. A typical repair runs $150 – $700, parts and labor included, with the written price handed to you before a single tool comes out.
Important safety note: gas furnaces involve natural gas lines and combustion. If you smell gas or suspect a cracked heat exchanger, shut the system off at the thermostat and call us before running it again. This is not a repair to attempt without training and a combustion analyzer.
Ignitor and Flame Sensor Failures
The ignitor is the ceramic piece that glows hot enough to light the gas. When it fails, the furnace blower may run but no heat comes out. Most ignitor replacements in Cupertino run $150 – $280, parts and labor included, and the job is often done within the first hour of the visit.
Gas Valve and Control Board Checks
A gas valve that hums but won’t open starves the burners of fuel. We test voltage, gas pressure, and the control board before recommending a replacement. In Cupertino’s older tract homes, the board sometimes fails because attic heat and dust have been working on it for 25 years.
Furnace Tune Up in Cupertino
Furnace Tune Up in Cupertino is the single best way to catch a failing part before it leaves you without heat in January. Our tune-up is $80 – $200 depending on system age and accessibility, and it includes a written report of what we actually found, not a vague checklist with checkmarks. Every tune-up covers the burners, heat exchanger, inducer motor, gas pressure, thermostat calibration, and safety controls.
Heat Exchanger Inspection
During a tune-up, we inspect the heat exchanger for cracks using a visual scope and a combustion analyzer. In Cupertino’s older furnaces, this is where we find the problems that justify replacing the system before it becomes an emergency. If the heat exchanger is failing, we’ll show you photos and walk you through your options without pressure.
Static Pressure and Airflow Testing
Most Cupertino homes have ductwork that was sized for a furnace installed decades ago. We test static pressure during the tune-up because a blower motor pushing against undersized ducts runs hot, noisy, and dies early. If the reading is off, we’ll tell you what it means and what the fix would cost, in writing, before anything is done.
Trusted Brands We Service in Cupertino
We service Trane, Lennox, Goodman, and Rheem furnaces, along with the rest of the major residential brands, and we keep common parts for these systems stocked locally so a Cupertino repair doesn’t wait on a warehouse shipment. If your furnace is a 1980s Rheem with a weak inducer motor or a Lennox that’s been short-cycling for a year, the technician who shows up will know the unit. No flipping through a manual at your kitchen table.
Common Furnace Repair Problems We See in Cupertino Homes
- Short-cycling on foggy winter nights. Cupertino’s microclimates, especially near the Santa Cruz Mountains, mean a furnace that runs fine at 3 p.m. may cycle on and off repeatedly at 3 a.m. when the fog rolls in and the air cools unevenly. The usual culprits are an oversized furnace, a dirty flame sensor, or a thermostat placed in a drafty hallway.
- Loud blower motors in older tract homes. A blower motor that roars is often fighting 30-year-old ductwork that was never re-sized when the current furnace was installed. We measure static pressure and, when the numbers confirm it, we recommend the right fix rather than just swapping the motor and waiting for it to fail again.
- Asbestos-wrapped ducts in the attic. Many Cupertino homes built before the late 1970s have duct wrap containing asbestos. Any repair that requires cutting into the attic ductwork should start with a visual check for that wrap. If we find it, we’ll tell you before any work proceeds so you’re not hit with abatement costs unexpectedly.
- Thermostats that don’t talk to the furnace. Cupertino has one of the highest smart-thermostat adoption rates in the Bay Area, and older control boards sometimes don’t communicate properly with newer thermostats. We see this often after a homeowner upgrades on their own and blames the furnace when the real issue is a wiring or compatibility problem.
See the difference
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After
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AfterPricing for Furnace Repair in Cupertino, CA
We publish our ranges because homeowners have been quoted one number on the phone and charged another at the door too many times. Here’s what furnace work in Cupertino actually costs:
| Service | Typical Price Range |
|---|---|
| Gas Furnace Repair | $150 – $700 |
| Furnace Tune Up | $80 – $200 |
The spread depends on what failed. A flame sensor cleaning is on the low end. A gas valve or control board replacement is on the higher end. We give you the exact written price before any work begins, and that number does not change at the door. Estimates are free. Call (669) 800-4179 and we’ll put a number on it.
Why a $25 Part Sometimes Becomes a System Decision in Cupertino
Cupertino has a specific housing situation that turns simple furnace repairs into bigger conversations. The city is dominated by single-family tract homes built from the 1960s through the 1990s, many with original attic-mounted gas furnaces, original R-22 condensers, slab foundations, and in some cases asbestos-wrapped ductwork. A homeowner may call us for a $25 capacitor, and during the repair we find a heat exchanger with early cracking on a 1987 Rheem. The system is past its life. The ducts are wrapped in asbestos. The slab foundation makes duct replacement invasive and expensive.
At that point, the honest conversation is not “should we patch this furnace” but “what does a full redesign look like and what does it cost.” In many Cupertino homes, that means a SEER2 heat pump with a multi-zone mini split for the upstairs addition, sealing the existing ducts rather than tearing them out, and re-commissioning static pressure so the system actually delivers the efficiency on the label. Title 24 compliance is part of the equation here, and Apple-driven demand for quiet, premium equipment means most Cupertino homeowners want systems that run almost silently.
Last February, our crew was called to a 1987 Rheem gas furnace in the Monta Vista neighborhood. Intermittent heat, loud blower motor. We found a weak capacitor and a heat exchanger with early cracking. The homeowner had already upgraded to a smart thermostat, so we recommended a full system redesign: a heat pump with a multi-zone mini split for the upstairs addition, sealing the original asbestos-wrapped ducts, and re-commissioning static pressure to hit the label’s SEER2 rating. That job started as a “can you fix my furnace” call and ended with a system that actually heats and cools the entire house evenly for the first time in years.
That’s the takeaway: in Cupertino, a furnace repair is sometimes exactly what it sounds like, and sometimes it’s the opening to a system-level decision. We’ll tell you which one you’re facing and show you the numbers either way.
We Also Serve Cities Near Cupertino
Our Furnace Repair in Cupertino coverage extends to the surrounding communities, including Saratoga, Sunnyvale, Mountain View, and Santa Clara. If you’re just over the city line, the same live-person phone answer, the same written pricing, and the same 365-day guarantee apply. Dispatch and scheduling are coordinated from the brand’s San Francisco Bay Area office, and crews serve Cupertino locally.
Serving Cupertino, CA - Our Local Coverage Area
We’re based in the Cupertino 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 About Furnace Repair in Cupertino
Short-cycling on those nights usually comes from one of three issues: an oversized furnace that heats the house too quickly and shuts down before the space is evenly warm, a dirty flame sensor that drops the signal and cuts the flame, or a thermostat placed where fog-cooled air pools around it. In Cupertino’s microclimates near the Santa Cruz Mountains, the temperature difference between 2 p.m. and 2 a.m. can be wide enough that a borderline furnace behaves differently at night. We’ll test the furnace’s actual input versus the home’s load calculation to find which one is causing it. Call (669) 800-4179 and we’ll diagnose it properly.
We can repair the furnace itself, absolutely, and we’ll do it with a written 365-day guarantee. The question is whether the repair makes sense on a unit that’s 30+ years old with an R-22 condenser that’s already phased out. In Cupertino’s 1970s and 1980s tract homes, many original Carrier furnaces are still running, but the heat exchangers and blower motors are at end of life. We’ll give you the honest number for the repair and the honest number for a replacement, side by side, and let you decide without pressure. The estimate is free.
Our technician will visually check the duct wrap during the first visit, before any cutting happens. In Cupertino homes built before the late 1970s, it’s common to find white, fibrous wrap that contains asbestos. If we see anything that looks like it, we stop and tell you before any work proceeds. Testing for confirmation is available, and if abatement is needed, we’ll coordinate the right contractor so you’re never left with open ductwork and no heat.
Yes, and it matters. Multi-zone systems in Cupertino’s larger homes, especially the ones with upstairs additions, have zone dampers, multiple thermostats, and sometimes two separate furnaces or a furnace plus a heat pump. A repair that ignores zone balance or static pressure on one branch can leave the upstairs cold and the downstairs sticky. Our technicians test each zone’s airflow and controls separately, because treating a multi-zone home like a single-zone one is exactly the kind of corner-cutting that leaves a repair failing inside a year.
A tune-up is scheduled maintenance that includes a full heat exchanger inspection using a visual scope and a combustion analyzer, and it costs $80 – $200. A repair is what happens when something has already failed, like a cracked heat exchanger, a bad gas valve, or a dead ignitor, and it runs $150 – $700. The tune-up is how we catch the heat exchanger cracking before it becomes a carbon monoxide problem. If we find cracks during a tune-up, we’ll show you photos, explain the risk in plain English, and give you a written price for whatever comes next.
Call (669) 800-4179 for any furnace repair question in Cupertino. A live person answers around the clock, and fixing furnaces in this city is what we do every week, not a side job.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air San Jose, serving Cupertino since 2003.