Seasonal 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.
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AfterFast, Reliable Furnace Repair Across San Francisco
Furnace repair in San Francisco typically costs $175 – $825 and our Furnace Repair team can usually reach you same-day when your heat goes out. We’re based in the San Francisco Bay Area, with crews that know the city’s neighborhoods, its fog-belt microclimates, and the peculiarities of heating systems in 100-year-old Victorians.
When your floor furnace quits on a January morning in the Richmond, or your blower motor seizes in the Outer Sunset, you need someone who understands that San Francisco furnace repair isn’t a generic job. The city’s housing stock, its salt-laden marine air, and its century-old subfloors create failure modes that contractors from Walnut Creek or San Jose simply don’t encounter. That’s why our dispatch and scheduling are coordinated right here from our San Francisco Bay Area office, not routed through a call center three states away. Call (984) 538-9003 and a live person picks up, 24 hours a day.
Why Brandt HVAC Is San Francisco’s Preferred Furnace Repair Company
We’ve been part of the San Francisco home-service landscape since 2003, when Brandt HVAC joined the Threshold Group family. The name Brandt comes from an old word for firebrand, a fitting name for the work of keeping a home warm. In a city where opening your door to a stranger is a genuine concern for many homeowners, we’ve built our reputation on certainty: certain price, certain identity, certain outcome.
Our Threshold Verified standard means every technician is background-checked and identity-verified. We send you their name and photo before they arrive, and they show a photo ID badge at your door. Anyone who shows up unannounced, that visit is on us. We fix it.
Every repair begins with a written price before any work starts. No exceptions. Every repair also carries a written guarantee under our 365-Day Done Right Promise, if the repair fails, we return at no charge. No argument. Our phones are staffed by live people around the clock, nights, weekends, and holidays. No voicemail, no callback queue, no automated phone trees.
Furnace Tune Up in San Francisco
Furnace Tune Up in San Francisco is preventive maintenance designed for a heating system that runs low and long nearly year-round in fog-belt neighborhoods, not the seasonal blast-and-rest cycle seen inland. The job includes cleaning burners and flame sensors, testing gas pressure and combustion, checking heat exchanger integrity, measuring blower amp draw, and inspecting venting for proper draft. In San Francisco’s climate, where a furnace might accumulate 2,000+ run hours annually compared to half that in a hotter interior climate, these checks catch wear before it becomes failure. A Furnace Tune-Up runs $95 – $235.
What We Find in Older Systems
In Victorian and Edwardian homes across the Inner Richmond and Haight-Ashbury, we regularly pull blower motors drawing 30-50% over rated amps from decades of continuous low-speed operation. Heat exchangers show thermal fatigue cracks invisible to the naked eye until we scope them. A tune-up doesn’t restore metal that’s fatigued past safe limits, but it identifies the problem before carbon monoxide becomes a risk.
Electrical and Venting Checks
Many San Francisco homes still operate on original electrical panels or early replacement panels that lack the capacity for modern furnace electronics. During our tune-up, we verify your panel can handle the load and that venting clears properly, critical in homes where original floor furnaces vented through walls or chimneys never designed for forced-air equipment.
Emergency Furnace Repair in San Francisco
Emergency Furnace Repair in San Francisco means responding when your heat fails during a cold snap or your system shows signs of a dangerous malfunction like a cracked heat exchanger or gas leak. We treat these calls with priority dispatch, and because we’re based in the San Francisco Bay Area, our crews can reach most neighborhoods quickly. Emergency repair costs fall within our standard $175 – $825 range, we don’t charge overtime premiums for after-hours or weekend calls.
Signs You Need Immediate Service
A rotten-egg smell indicates a gas leak, leave the house and call from outside. A loud boom at startup suggests delayed ignition risking heat exchanger damage. If your carbon monoxide detector alarms, treat it as an emergency. These aren’t wait-and-see situations in any home, but in San Francisco’s tightly packed row houses with shared walls, the stakes for a gas leak or fire are especially high.
What Happens When You Call
A live person answers, always. We confirm your address, describe the symptoms you’re seeing, and dispatch the nearest available technician. You’ll receive a name and photo before they arrive. They’ll diagnose the problem, present a written price, and explain exactly what the repair covers. Work starts only when you approve it.
Trusted Brands We Service in San Francisco
We repair and maintain all major residential HVAC brands, including Trane, Lennox, Goodman, and Rheem. Our San Francisco crews carry common failure parts for these brands, ignitors, blower motors, gas valves, control boards, which means most repairs complete in a single visit. For older systems or specialty components, our Bay Area parts network typically sources overnight what we don’t stock. We’ve worked on everything from 1980s Carrier gravity floor furnaces in the Inner Richmond to recent Lennox installations in Noe Valley, and we understand how each manufacturer’s design interacts with San Francisco’s specific conditions, salt air, tight mechanical spaces, and electrical constraints.
Common Furnace Repair Problems We See in San Francisco Homes
- Cracked heat exchangers in gravity floor furnaces. Original floor furnaces in Inner Richmond and Haight-Ashbury Victorians have run for a century with constant low-grade burning. The heat exchanger metal fatigues thermally, cracks form, and no tune-up can restore safe operation. Replacement requires navigating San Francisco’s DBI permit process and the physical reality of a subfloor never designed for modern equipment.
- Blower motor failure from cumulative run hours. In fog-belt neighborhoods like the Outer Sunset, furnaces run nearly year-round. Motors designed for intermittent cycling instead accumulate thousands of hours annually, bearings wear, amp draw climbs, and eventual seizure becomes inevitable. We measure this during every service call.
- High static pressure from undersized original ductwork. Single-zone systems in Victorians and Edwardians often rely on ductwork sized for gravity convection or early forced-air. The blower works against excessive resistance, overheats the heat exchanger, and shortens equipment life. A like-for-like swap without addressing ducts disappoints.
- Salt-air corrosion on outdoor components. Ocean fog in the Richmond, Outer Sunset, and Sunset District corrodes condenser coils, cabinets, and wiring faster than inland locations. Even heating-only systems with outdoor heat pumps or vent terminations show accelerated degradation.
Pricing for Furnace Repair in San Francisco, CA
Most furnace repairs in San Francisco fall between $175 and $825, with the majority of common jobs, ignitor replacement, blower motor repair, gas valve replacement, capacitor swap, landing in the $250 – $550 range. A capacitor replacement specifically runs $175 – $400. What moves the needle: accessibility (crawl spaces under floor furnaces take longer), parts availability for obsolete systems, and whether electrical or ductwork issues must be addressed alongside the furnace itself.
| Service | Price Range |
|---|---|
| Furnace Repair | $175 – $825 |
| Furnace Tune-Up | $95 – $235 |
| Capacitor Replacement | $175 – $400 |
We give you a written price before any work starts, every single job, with no exceptions. Estimates are free. Call (984) 538-9003 for an exact quote on your specific system.
We Also Serve Cities Near San Francisco
Our Furnace Repair in San Francisco crews also handle calls in Daly City, Brisbane, Sausalito, and South San Francisco. The same Threshold Verified technicians, the same upfront pricing, the same live-answer phones. If you’re just outside city limits, we can still reach you quickly.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco 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 San Francisco
This pattern usually means a cracked heat exchanger triggering the high-limit safety switch, or a blower motor failing to move enough air across the heat exchanger. In Inner Richmond Victorians, we see both constantly, decades of low-and-slow cycling fatigues the metal and wears the motor. A tune-up can identify which, but replacement is often the only safe fix. Call (984) 538-9003 for a free inspection.
Yes. San Francisco’s Department of Building Inspection requires permits for furnace replacement, and floor furnace decommissioning or replacement involves additional scrutiny because of the structural work around the subfloor opening. We handle the permit paperwork as part of our installation process. The alternative is an unpermitted job that complicates future sale or insurance claims.
Because the original equipment was likely oversized or poorly matched to ductwork that was itself an afterthought, and a century of settling has made that ductwork leakier. A modern furnace needs proper airflow, proper static pressure, and often a smaller capacity than what came out. We run a Manual J load calculation and inspect duct integrity before specifying replacement equipment. Swapping without this step leaves you with noise, hot and cold rooms, and premature failure.
Usually yes, but it requires planning. Seismic retrofits add shear walls and structural elements that can block original equipment locations and lineset paths. We survey the new layout, identify alternate routing through attics or revised crawl spaces, and coordinate with your retrofit contractor if structural modifications are needed. We’ve done this exact scenario in multiple San Francisco buildings post-retrofit.
It depends on the furnace’s condition and your building’s constraints. Outer Sunset’s minimal cooling load and year-round heating demand make heat pumps viable, but many homes need electrical panel upgrades first, and some landlords or HOAs resist the switch. If your furnace has a sound heat exchanger and the repair is under $400, repair can buy years. If the exchanger is cracked or the system is pre-1980, replacement, often with a heat pump, is the safer long-term investment. We’ll give you honest numbers either way. Call (984) 538-9003.
Ready to get your heat back? Call Brandt HVAC at (984) 538-9003 for a free estimate. A live person answers 24 hours a day, and we’ll send you your technician’s name and photo before they arrive at your San Francisco home.
Written by Devin Marlowe, Owner at Brandt HVAC, serving San Francisco since 2003.