Furnace Repair in San Francisco

A furnace that stops working during San Francisco's cool, damp winters is more than an inconvenience — it's a genuine comfort and health concern, especially for families with young children or elderly members. Whether your furnace won't ignite, blows cold air, or cycles on and off without properly heating your home, you need a repair service that shows up quickly and solves the problem. PrimoPeak is that service.

We provide professional furnace repair throughout San Francisco and the greater Bay Area. Our certified technicians work on gas furnaces, electric furnaces, and dual-fuel systems from every major brand. With same-day appointments and honest, upfront pricing, we take the stress out of furnace repair. Call (415) 555-0199 to schedule your service today.

Common Furnace Problems We Fix

Gas furnaces are the most common heating systems in San Francisco homes, and they contain ignition systems, heat exchangers, blower assemblies, gas valves, and electronic controls that can all develop problems. Here are the issues our customers call about most often:

• Furnace not heating — The most urgent call we get. Your thermostat is set to heat, the system seems to run, but the air coming from your vents is room temperature or barely warm. This can be caused by a failed igniter, a dirty flame sensor, a malfunctioning gas valve, a cracked heat exchanger, or a control board fault. In electric furnaces, a burned-out heating element is the most common cause.
• Pilot light or igniter problems — Older furnaces with standing pilot lights can have the pilot blow out due to drafts or a failing thermocouple. Modern furnaces use hot surface igniters or spark ignition systems that wear out over time. A furnace that won't ignite can't produce heat, making this a priority repair.
• Short cycling — When your furnace turns on for a few minutes, shuts off, then repeats the cycle without ever reaching the desired temperature, it's short cycling. This is usually caused by an overheating condition that triggers the high-limit safety switch. Common culprits include a dirty filter restricting airflow, a faulty flame sensor, or a malfunctioning blower motor.
• Strange noises — Furnaces can produce a range of alarming sounds. A loud bang when the furnace ignites suggests delayed ignition from a dirty burner. Squealing or screeching points to a blower motor bearing issue or a loose belt. Rattling may indicate loose panels or ductwork. A persistent clicking without ignition suggests a faulty control board or igniter.
• Blowing cold air — A furnace that runs the blower but delivers cold air may have a failed igniter, an extinguished pilot light, a closed gas valve, or a tripped flame rollout switch. In some cases, the blower is running on the fan-only setting due to a thermostat misconfiguration.
• Furnace won't ignite — You hear the click and the inducer motor spins up, but the burners never light. This is frequently caused by a cracked or worn hot surface igniter, a dirty flame sensor that shuts down the gas valve as a safety precaution, or a faulty ignition control module.
• Unusually high heating bills — If your gas or electric bills have jumped without a change in your heating habits, your furnace may be losing efficiency. Dirty burners, a failing blower motor, leaking ductwork, or a furnace that's simply aging can all drive up operating costs significantly.
• Thermostat issues — Sometimes the furnace is fine but the thermostat is the problem. A thermostat that's miscalibrated, has dead batteries, is poorly located (near a heat source or drafty window), or has wiring issues can cause your furnace to behave erratically.

Our Furnace Repair Process

Furnace repair involves combustion systems and gas lines, so safety and precision are essential. Here's how PrimoPeak approaches every furnace repair job:

Step 1: Book your appointment. Call (415) 555-0199 or schedule online. Describe the problem — no heat, strange noises, short cycling, or anything else — so our technician can arrive prepared. We offer same-day appointments with priority scheduling for heating emergencies.

Step 2: Safety inspection and diagnosis. Our technician performs a comprehensive inspection of your furnace, including the ignition system, burner assembly, heat exchanger, blower motor, gas connections, flue venting, thermostat wiring, and safety controls. We use combustion analyzers, multimeters, and thermal imaging where needed to pinpoint the problem accurately.

Step 3: Clear explanation and estimate. We tell you exactly what's wrong, why it happened, and what it will cost to fix. You receive a written estimate before we touch anything. If the repair cost is significant, we'll discuss whether repair or replacement makes more sense given the age and condition of your furnace.

Step 4: Expert repair. With your go-ahead, we complete the repair using parts that meet or exceed manufacturer specifications. Our service vehicles carry the most commonly needed furnace parts — igniters, flame sensors, blower motors, capacitors, gas valves, and control boards — so most repairs are finished in a single visit.

Step 5: Safety testing and verification. After the repair, we test your furnace through multiple heating cycles. We measure supply air temperature, check gas pressure, verify proper combustion with a flue gas analyzer, test all safety controls, and confirm that the thermostat communicates correctly. We also check carbon monoxide levels to ensure your furnace is operating safely.

Furnace Repair Cost in San Francisco

Furnace repair in San Francisco typically falls between $150 and $500, depending on the problem and parts needed. Here's what common furnace repairs cost:

• Diagnostic fee: $89, waived when you proceed with the repair
• Hot surface igniter replacement: $150–$250
• Flame sensor cleaning or replacement: $100–$180
• Thermocouple replacement (standing pilot systems): $120–$200
• Blower motor replacement: $250–$450
• Gas valve replacement: $250–$400
• Draft inducer motor replacement: $250–$450
• Control board replacement: $250–$500
• Heat exchanger replacement: $500–$1,000+

Heat exchanger replacement is one of the most expensive furnace repairs. If your heat exchanger is cracked and the furnace is older than 15 years, replacement of the entire furnace is often the more practical and cost-effective solution. A new furnace installation in San Francisco runs $3,500 to $8,000 depending on the system, but it comes with modern efficiency ratings, a full manufacturer warranty, and peace of mind.

For most other repairs, the math strongly favors fixing your existing furnace rather than replacing it. A $200 igniter replacement on a 10-year-old Lennox or Rheem furnace can keep it running reliably for many more years.

Why Choose PrimoPeak for Furnace Repair

Furnace repair demands a combination of technical skill, safety awareness, and honest communication. Here's why San Francisco homeowners trust PrimoPeak:

Gas safety expertise. Gas furnace repair is not something to entrust to a general handyman. Our technicians are trained in gas line safety, combustion analysis, carbon monoxide detection, and proper venting. We follow all California codes and manufacturer specifications for every repair.

All major brands covered. Whether you have a Carrier high-efficiency furnace, a Trane gas pack, a Goodman builder-grade unit, or a Bryant two-stage system, we have the brand-specific training to diagnose and repair it correctly. We're experienced with both single-stage and variable-speed systems.

Same-day heating restoration. When your furnace fails during cold weather, hours matter. We offer same-day furnace repair across San Francisco and surrounding Bay Area communities. Call (415) 555-0199 and we'll get a technician to you as quickly as possible.

Carbon monoxide safety check included. Every furnace repair includes a carbon monoxide test at your registers and near the furnace. A cracked heat exchanger or improper venting can allow this odorless, dangerous gas to enter your home. We check for it as standard practice because your family's safety is non-negotiable.

Transparent pricing, no pressure. We provide a detailed estimate before any repair begins. If the furnace needs a major repair that doesn't make financial sense, we'll tell you that directly and help you understand your replacement options. We never pressure you into a decision.

Preventive maintenance advice. After every repair, we share practical tips for keeping your furnace healthy — filter replacement schedules, thermostat best practices, and warning signs to watch for. A well-maintained furnace lasts longer, runs more efficiently, and breaks down less often.

90-day warranty on parts and labor. Every furnace repair we perform comes with our 90-day warranty. If the same issue returns, we return too, at no cost to you.

San Francisco winters may not bring snow, but they bring persistent cold and dampness that makes a working furnace essential. When yours needs repair, PrimoPeak delivers fast, safe, expert service at a fair price. Call (415) 555-0199 or book your furnace repair online today. We also provide AC repair and full HVAC repair service for all your home comfort needs.