Furnace Repair
Gas and electric furnace diagnosis and repair Professional service throughout the San Francisco Peninsula with same-day appointments available.
Direct answer
For furnace repair, start with a real diagnosis of the system, controls, airflow, and visible equipment condition. The visit should produce clear next steps: repair, maintenance, replacement planning, or no immediate work if the system is operating correctly.
We schedule furnace repair across the San Francisco Peninsula with same-day appointments and 24/7 phone support. To book a visit or get a diagnosis, call (650) 396-3290.
About Our Furnace Repair Service
Your furnace is the heart of your home's heating system, and when it stops working properly, you feel it immediately. Our furnace repair service covers both gas and electric furnaces of all makes and models, from older atmospheric units to modern high-efficiency condensing furnaces.
Gas furnace repair requires specialized knowledge and equipment because of the safety considerations involved. Our technicians are trained to work safely with gas appliances and carry combustion analyzers to verify proper operation. We test for carbon monoxide, check gas pressures, inspect heat exchangers for cracks, and verify that all safety controls are functioning correctly.
Common furnace problems we repair include igniter failures (the most common cause of no-heat calls), flame sensor issues, blower motor problems, control board failures, gas valve malfunctions, and limit switch trips. Many of these repairs can be completed in a single visit with parts from our trucks. For heat exchanger problems or other major component failures, we'll discuss your repair-vs-replace options honestly.
Electric furnaces, while less common on the Peninsula, have their own set of potential issues including heating element failures, sequencer problems, and blower issues. We service these units as well, providing the same thorough diagnostic approach and upfront pricing.
The age and efficiency of your furnace matters for repair decisions. Furnaces typically last 15-20 years, and at some point, repair costs become harder to justify compared to the benefits of a new, more efficient unit. We'll give you honest advice about your options—we don't push replacements when repairs make sense, and we won't waste your money on repairs when replacement is the better choice.
How We Think Through Furnace Repair
Starts then shuts down
Ignition sequence, flame sensing, pressure switches, venting, and limit controls need to be checked in order.
Blows cold air
This can be a thermostat, ignition, gas, limit, or blower issue depending on when the blower starts and stops.
Error light or lockout
Status codes help narrow the diagnostic path but still need confirmation at the component level.
Safety alarms or gas odor
Gas smells and carbon monoxide alarms are stop-work situations. Leave the area and call the proper emergency utility first.
Repair, Maintain, or Replace?
Safety comes before heat
Combustion, venting, flame rollout, heat exchanger condition, and carbon monoxide risk matter more than getting temporary heat.
Ignition parts are common repair items
Igniters, flame sensors, pressure switches, and control faults can often be diagnosed without replacing the furnace.
Age changes the conversation
Older furnaces with safety, exchanger, or repeated control issues may deserve a replacement discussion.
Signs You Need Furnace Repair
Our Furnace Repair Process
Safety and carbon monoxide check
Inspect heat exchanger
Check ignition system
Test gas valve and pressure
Verify safety controls
Test operation
Furnace Repair Cost Factors
Safe Checks Before You Book
Check thermostat and filter
Heat mode, setpoint, batteries, and a clean filter are safe first checks.
Check breaker and furnace switch
A nearby wall switch can be turned off accidentally during storage or cleaning.
Do not bypass safety switches
Jumping safeties can create fire, gas, or carbon monoxide risk.
Do not open electrical panels, bypass safeties, vent refrigerant, or keep running equipment that smells hot, leaks water, or repeatedly trips protection.
Furnace Repair Service Areas
We provide furnace repair throughout the Peninsula
Furnace Repair FAQ
Furnace Repair costs vary based on system type, access, parts, and whether the work is a repair, tune-up, or installation plan. You should receive a clear diagnosis and approved option before work begins.
Ready for Furnace Repair?
Schedule your appointment today. Clear pricing, no surprises.
24/7 Phone Support, Technicians 8am-8pm Daily