(408) 978-3093

Furnace Repair and Installation in San Jose, CA

No heat on a cold night, a furnace that clicks but won't light, or one that blows cold air: our San Jose technicians repair every major brand, maintain furnaces so they run safely, and install new furnaces or heat pumps when it's time to replace.

  • Google 4.9130+ reviews
  • Licensed C-36 · C-20 · ACSLB License #1101278
  • 1-year labor warranty24/7 service since 1986
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A smiling CPI Service plumber with a toolbox next to a CPI Service van in a San Jose driveway

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Furnace Services in San Jose

Gas and electric furnaces, in attics, closets, garages and crawlspaces.

  • Furnace repair

    Igniters, flame sensors, pressure switches, inducer and blower motors, gas valves and control boards diagnosed and replaced.

  • Furnace installation

    High-efficiency and standard furnaces sized with a load calculation, installed with venting, gas connection, permit and required testing.

  • Furnace replacement

    Old and unsafe furnaces replaced. We'll also price a heat pump or dual-fuel system.

  • Furnace maintenance

    Fall tune-ups: burner and flame check, heat exchanger inspection, safety controls, venting, filter and blower.

  • Combustion and CO safety checks

    Venting, draft and carbon monoxide checks, and cracked heat exchangers found before they're dangerous.

  • No-heat emergencies

    Our 24/7 line takes no-heat calls on cold nights and weekends.

Signs Your Furnace Needs Repair

Furnaces usually give warning before they quit.

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  • No heat, or it won't light

    A failed igniter, flame sensor, pressure switch or gas valve. See furnace not igniting.

  • Blowing cold air

    The burners shut off on a safety, the filter is clogged, or the thermostat is set to fan On. See furnace blowing cold air.

  • Short cycling

    Turning on and off quickly from overheating, a dirty flame sensor or an oversized furnace.

  • Strange noises

    Squealing blower bearings, rattling panels or a booming ignition.

  • Yellow flames or soot

    Poor combustion that needs attention right away.

  • Higher gas bills

    A furnace losing efficiency, or one near the end of its life.

Common Furnace Problems

  • Dirty flame sensor. The furnace lights, then shuts off after a few seconds. Cleaning or replacing the sensor fixes it.
  • Failed igniter. Hot surface igniters crack with age; the furnace clicks and tries but never lights.
  • Pressure switch faults. A blocked vent, condensate problem or failing inducer motor keeps the switch from closing. See furnace pressure switch stuck open.
  • Clogged filter. The furnace overheats and shuts off on its limit switch.
  • Blower motor problems. Weak airflow, noise or no air at all.
  • Thermostat issues. Wrong settings, dead batteries or wiring problems. See furnace not turning on.

Repair or Replace Your Furnace?

Repair parts like sensors, igniters and switches on a furnace in good shape. Consider replacement when the furnace is over about 15 to 20 years old, the heat exchanger is cracked, repairs are getting frequent, or you want to add or replace air conditioning at the same time. When you replace, compare a new furnace with a heat pump or a dual-fuel system; with San Jose’s mild winters, a heat pump often heats the whole house efficiently.

Furnace Safety

Gas furnaces are safe when they’re maintained and properly vented. Have the furnace checked every fall, keep the area around it clear, replace filters regularly, and keep working carbon monoxide alarms on every level of the home. If you smell gas, leave the house and call PG&E or 911.

Sources

Checked October 2026.

How Much Does Furnace Repair Cost in San Jose?

Most furnace repairs in San Jose cost $150 to $1,500, depending on the part; a variable-speed blower motor can reach $2,000. A standard gas furnace replacement typically costs $5,000 to $9,000 (see our furnace replacement cost guide); we give you a written price after a load calculation.

Typical furnace services prices in San Jose, installed, in US dollars. Checked October 2026.
ServiceTypical San Jose price (USD)
Flame sensor$150–$350
Furnace igniter$200–$450
Pressure switch$250–$500
Inducer motor, gas valve or control board$500–$1,500
Blower motor$400–$900
Dual-fuel system (heat pump + furnace)$10,000–$20,000
Inspection feeWaived for service plan members$59

What affects the price

  • The part. A flame sensor is quick; a control board or inducer motor costs more.
  • Age. On a furnace over 15 to 20 years old, a major repair may not be worth it.
  • Location. Attic and crawlspace furnaces take longer to service.
  • Venting and ducts. Replacements may need new venting or duct changes.
  • Timing. Nights, weekends and holidays are billed at emergency rates.

Most repairs are quoted as a fixed price before we start. Ranges are typical for San Jose and the South Bay and don't include current specials.

Read the furnace repair cost guide →

How Our Furnace Repair and Installation Works

  1. Call or book online

    No-heat calls get priority, with a 24/7 line for emergencies.

  2. Diagnose

    We read error codes and test the ignition sequence, safeties, gas pressure and venting.

  3. Written price

    Repair or replace, with an honest recommendation.

  4. Repair or install

    Repairs from a stocked truck; installs with permit, venting and gas connection.

  5. Safety test

    We check combustion, carbon monoxide, temperature rise and every safety control.

  6. Inspection and follow-up

    New furnaces get the City inspection and any required testing.

Heating in San Jose

What matters for heating a South Bay home.

  • Mild winters

    San Jose's winters are mild, so many homes are good candidates for a heat pump when an old furnace needs a major repair.

  • The Air District rule

    The Bay Area Air District has adopted a rule to phase out sales of new gas furnaces that emit NOx, currently set for 2029. Working furnaces aren't affected; check the current status before planning a replacement.

  • Permits and Title 24

    Furnace replacement needs a permit, and Title 24 can require duct leakage testing by a HERS rater.

  • Carbon monoxide alarms

    California requires CO alarms in homes with gas appliances or attached garages; we check combustion and venting on every visit.

  • Attic furnaces

    Many ranch homes have furnaces in the attic, where a clogged condensate line or blocked filter shows up as a leak or overheating.

Neighborhoods we serve: Downtown San Jose · Willow Glen · East San Jose · South San Jose · Evergreen · Cambrian Park · West San Jose · Berryessa · North San Jose · Blossom Valley

Current Specials

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What Our Customers Say

Google 4.9 from 130+ reviews: read more →See photos of our work →

  • CPI and Alex were extremely helpful when our local church’s water heater kept malfunctioning and needed replacing. From the initial diagnosis, explanation and recommendation of replacement, we always felt that our needs were being tailored to. Not only were they extremely kind, knowledgeable and professional, but they also were diligent and efficient during their time.

    We’re truly grateful for their excellent work and would highly recommend CPI to anyone in need of plumbing or heating services, especially for those in larger community buildings like churches like ours.

    Stephen S.Google review

  • Prompt response, polite, knowledgeable. Good at explaining options and following through until solved.

    Pauline M.Google review

  • Quality work, fair price, very responsive. Our go to company in Bay Area.

    A. C.Google review

Furnace Services FAQs

What does furnace service include?

Repair, maintenance, replacement and installation of gas and electric furnaces, including safety checks of venting and combustion.

How much does furnace repair cost in San Jose?

Typically $150 to $350 for a flame sensor, $200 to $450 for an igniter, $250 to $500 for a pressure switch, and $500 to $1,500 for an inducer motor, gas valve or control board.

What does a furnace tune-up involve?

Cleaning the burners and flame sensor, inspecting the heat exchanger, testing the igniter and safety controls, checking venting and gas pressure, measuring temperature rise, and replacing or cleaning the filter.

How much does it cost to have a furnace checked?

Our visit has a $59 inspection fee, waived for service plan members; repairs are quoted before we start.

How do I know what type of furnace I have?

Look at the rating plate inside the furnace door for the brand, model and fuel. A plastic (PVC) vent pipe usually means a high-efficiency condensing furnace; a metal flue means a standard-efficiency model.

Should I replace my furnace with a heat pump?

Often worth considering in San Jose's mild climate, especially if you also need a new AC. A heat pump replaces both, and local rebates may apply. A dual-fuel system keeps the furnace as backup.

Why is my furnace blowing cold air?

See furnace blowing cold air; common causes are a dirty flame sensor, a clogged filter, a pressure switch problem or a thermostat set to fan On.

Helpful Guides

Serving San Jose and the South Bay

Our shop is at 2880 Aiello Dr in San Jose. We provide furnace services across the city and nearby South Bay and Peninsula communities. See our full service area.

Furnace service in other cities

Content and prices reviewed October 2026.

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