Top-rated independent heating and cooling across California's Central Valley and the Sierra foothills

Furnace Repair in Sunnyvale, CA — Book a Visit Today

Cold air from the vents, a burner that lights and quits, or a blower that runs all night without warming the house are the three complaints we hear most on winter mornings. We handle furnace repair in Sunnyvale for homeowners dealing with short cycling, a furnace that trips out on the high limit, an igniter that never glows, or a thermostat calling for heat with nothing happening downstream. Before you call, check that the thermostat has fresh batteries, look for a tripped breaker, and swap a loaded filter. If the heat is still off, call us or send the quote form and we will get a technician out to look at it.

Call (888) 381-2953

A real person answers
Open 7 days
Written quote before work starts

Taking calls until 5:00 PM PT

Furnace Repair technician working in Sunnyvale, CA

All major brands repairedCarrier Trane Lennox Goodman Rheem York American Standard Bryant

Furnace Repair technician in Sunnyvale, CA

Common furnace faults in Sunnyvale homes

The furnace blows but the air is cold Ignition failure, flame sensor fouling, or a gas valve not opening
It starts, runs a minute, then shuts off Short cycling from a dirty filter, blocked flue, or a tripped limit switch
I hear a click and then nothing happens Failed ignitor, control board relay, or a transformer that has given up
There is a boom or rumble when the heat kicks on Delayed ignition from dirty burners or a gas pressure problem
The thermostat says heat but nothing turns on at all Thermostat wiring, a tripped breaker, a blown fuse on the board, or a door safety switch

Search for it as furnace repair or heating repair and you land in the same place: one visit, one written quote.

Sunnyvale coverage

From Sunnyvale we also cover Mountain View, Santa Clara, Cupertino, Los Altos, Milpitas and San Jose.

Specific furnace repair work in Sunnyvale

Gas Furnace Repair

Other repairs we do in Sunnyvale

Furnace Repair in cities near Sunnyvale

All furnace repair → · Sunnyvale service directory →

Sunnyvale permits, codes and utility programmes

Power here comes from Pacific Gas and Electric (PG&E).

TECH Clean California heat pump incentives and Energy Upgrade California are the programmes worth checking. Terms move, so confirm the current ones with the utility and we will point you at the paperwork.

Equipment changeouts are governed by California Title 24, Part 6 and normally call for a permit, with HERS verification and CF2R/CF3R registration on most changeouts. City of Sunnyvale Building Safety Division handles them.

The federal 25C Energy Efficient Home Improvement Credit applies to qualifying equipment, and the efficiency tier it requires is worth checking before you choose a system.

Guides & troubleshooting

How we compare to other HVAC companies in Sunnyvale

	Central Valley Air	Big-box repair chains	Handyman listings
Written quote before any work	✓	✕	✕
Live answer seven days a week	✓	✕	✓
Every major brand, gas or electric	✓	✓	✕
Independent, no manufacturer quotas	✓	✕	✓
Crews familiar with homes like yours	✓	✕	✓

Call (888) 381-2953

The same on every visit

The quote comes first, in writing

Covering 123 cities across California, Nevada.

Phones answered by people

Open 7 days, 8:00 AM to 5:00 PM PT.

Independent of every manufacturer

Carrier, Trane, Lennox, Goodman and more. We are not an authorized dealer for any of them.

Furnace Repair in Sunnyvale — quick answers

My furnace will not turn on at all. What should I do first?

Check the thermostat batteries and setting, then look for a tripped breaker, then check the filter. If all three look fine, call us. A furnace that gets power and a call for heat but stays silent usually has a control, safety switch, or ignition fault we need to test.

Do I need furnace repair or a replacement?

That depends on what failed, the age of the equipment, and whether the heat exchanger is intact. A single ignitor or flame sensor is a straightforward repair. A cracked heat exchanger or a failed compressor on a package unit changes the math, and we will show you what we found.

What does a burning smell from the vents mean?

A light dusty smell on the first cold morning is usually dust burning off the heat exchanger and fades in an hour. A sharp electrical or plastic smell is different. Shut the system off at the thermostat and call us before running it again.

I smell gas near the furnace. What now?

Leave the building immediately, take everyone with you, and call 911 or your gas utility from outside. Do not flip switches or use anything that sparks. Once the utility has made the home safe, call us and we will inspect the furnace and gas train.

How soon can you get to my Sunnyvale home?

Call us and we will give you a real window rather than a guess. During heat waves the schedule fills fast, so morning calls usually get same-day or next-day attention. If your system is down entirely and the house is climbing, tell us when you call and we will treat it that way.

How it works

Step 1
Tell us the symptom
Call or fill in the quote form. We ask what changed, when it started, and what the thermostat reads. That tells us whether to bring parts for a cooling fault or a heating fault.
Step 2
We diagnose on site
A technician checks the thermostat, the electrical side, airflow through the filter and coil, refrigerant pressures, and the outdoor unit. You get told what failed and why, in plain words, before anything is replaced.
Step 3
Repair and verify
We make the repair, then run the system and measure the results at the vents. If a part needs ordering, we say so and give you a realistic window instead of a vague promise.

Call (888) 381-2953

A real person answers
Open 7 days
Written quote before work starts

Why homeowners call us

Built for real valley heatWe work in areas where afternoons sit above 110 degrees and systems run for months without a break. That shapes how we size repairs, check capacitors and contactors, and judge whether a compressor is genuinely done.
Attic and package unitsPlenty of homes across the region run attic air handlers or rooftop package units instead of a garage furnace and a side-yard condenser. We are used to the access, the duct runs, and the drain issues those setups bring.
Dust and debris we expectAg dust, cottonwood fluff and grass clippings pack condenser coils and starve a system of airflow. We clean what we find and show you the difference, rather than adding refrigerant to a unit that just could not breathe.
Heating too, not only ACFurnace repair, heat pump faults and no-heat calls get the same attention as summer work. Ignition problems, cracked or failing components and short cycling all get diagnosed before we recommend anything larger.
All major brands, gas & electricFrom Carrier and Trane to Lennox, Goodman, Rheem and Bryant, serviced independently.
Straight answersWhen a replacement beats a repair, we tell you, sometimes before we roll a truck.