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
Most furnace repairs in San Francisco run $175-$825 and our Furnace Repair team typically arrives same-day for calls booked before noon. If your heat is out in the Richmond, the Mission, or down by Ocean Beach, we’re dispatching from our San Francisco Bay Area office with technicians who know the difference between a Sunset microclimate and a Potrero Hill one. Call (817) 402-2972 and a live person picks up, 24 hours a day.
San Francisco’s housing stock is unlike anywhere else in California. Thousands of Victorian and Edwardian wood-frame flats were built without ductwork and still heat with 40-to-60-year-old Williams and Empire gas wall furnaces. The coastal fog that keeps summers mild also carries salt that corrodes outdoor equipment years ahead of schedule. We factor that in before we quote a repair or recommend replacement.
Why Coldharbour Heating & Air Is San Francisco’s Preferred Furnace Repair Company
We’ve been serving San Francisco since our founding in 2003 as an independently owned and operated member of the Kingswell network. That means we answer to local homeowners, not a distant corporate office, and we work to written standards called The Kingswell Way: say the price before the work starts, show up in the window promised, leave the place cleaner than found, put the guarantee in writing, and come back if it fails.
Our 365-Day Done Right Promise is not a verbal assurance. Every repair gets a written guarantee. If the same part fails within 365 days, we return and correct it at no charge. No argument, no additional trip fee. Homeowners in Noe Valley, the Outer Sunset, and South of Market have that paper in their hands before the technician packs up.
Background-checked, uniformed technicians arrive in marked vans stocked with parts for Trane, Lennox, Goodman, and Rheem systems. We train on nine major residential HVAC brands so the person at your door can actually work on what’s installed, not just diagnose and order.
Phones are answered by a live person around the clock, every day of the year. No voicemail trees. No “call back during business hours.” When your wall furnace quits on a January night in the Richmond, someone real picks up and schedules the call.
Heat Pump Repair in San Francisco
Heat Pump Repair in San Francisco means fixing systems that both heat and cool by moving refrigerant between indoor and outdoor coils, and it’s increasingly common as California’s electrification mandates push homeowners off gas. In neighborhoods like the Mission and Noe Valley, where afternoon temperatures can hit the mid-80s while the Outer Sunset stays fogged in at 63°F, heat pumps must be sized for actual local conditions, not city-wide averages. A unit adequate for one microclimate may struggle in another just two miles away. Most heat pump repairs in San Francisco cost $175-$765.
Reversing Valve and Refrigerant Issues
The reversing valve switches your heat pump between heating and cooling mode. When it sticks or leaks refrigerant, you’ll get lukewarm air in winter or weak cooling in summer. We test pressures, check for leaks with electronic detectors, and recharge only after sealing the source.
Defrost Control Failures
San Francisco’s damp, cool mornings can trigger excessive frost on outdoor coils. If the defrost control board fails, the unit ices over and efficiency collapses. We replace the board or sensor and verify the outdoor coil’s coated finish is holding up against salt exposure.
Heating Repair in San Francisco
Heating Repair in San Francisco covers everything from gas wall furnaces in 1890s Victorians to forced-air systems in 1960s stucco apartment buildings. The work varies enormously because the housing stock does. A cracked heat exchanger in a Williams wall furnace in the Haight requires a completely different approach than a failed blower motor in a Sunset District mid-century building. Most heating repairs in San Francisco fall between $175-$825.
Wall Furnace and Floor Furnace Specialists
These units are built into walls or crawl spaces with no ductwork. When the thermocouple fails or the heat exchanger cracks, the unit may short-cycle, smell metallic, or shut down entirely. We red-tag unsafe units and explain replacement options, including ductless alternatives when ductwork is impossible.
Blower Motor and Capacitor Replacement
Older forced-air furnaces in 1940s-1960s apartment buildings often suffer from deferred maintenance. A seized blower motor or swollen capacitor stops airflow cold. We stock common sizes and test amperage draw to catch underlying electrical strain before it fails again.
Trusted Brands We Service in San Francisco
Our vans carry parts and diagnostic tools for Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard systems. For San Francisco homeowners, that means faster repairs without waiting for a warehouse shipment across the Bay. We regularly service Trane and Lennox heat pumps in Noe Valley retrofits, Goodman wall furnace conversions in the Mission, and Rheem systems in Daly City apartment complexes. When a coil or gas valve is needed, we source coated or corrosion-resistant specs for coastal properties because standard-grade parts deteriorate faster here.
Common Furnace Repair Problems We See in San Francisco Homes
- Cracked heat exchangers in aging Williams and Empire wall furnaces. These units, still common in thousands of SF flats and in-law units, often run 40 to 60 years past design life. A cracked exchanger leaks carbon monoxide and produces a metallic odor. We red-tag the unit and discuss replacement, typically with a ductless mini-split when ductwork is absent.
- Salt-fog corrosion on outdoor heat pump and mini-split coils. The marine layer that rolls through the Outer Richmond and Outer Sunset carries enough salt to pit condenser cabinets and degrade fin coatings within a few seasons. We specify coated coils and more frequent maintenance intervals for coastal properties.
- Microclimate mis-sizing on new installations. A heat pump specified for a mild Sunset summer may fail completely in a Noe Valley flat hitting 85°F the same afternoon. Our load calculations factor neighborhood-specific temperature data, not just zip-code averages.
- Blower motor and capacitor failures in stucco apartment buildings. 1940s-1960s buildings in the Sunset and Richmond often have original forced-air furnaces with deferred maintenance. Capacitors bulge and fail; blower motors seize from dust and bearing wear. We replace both and check duct static pressure to reduce future strain.
Pricing for Furnace Repair in San Francisco, CA
We publish actual ranges because homeowners deserve to know before they call. Every repair starts with a diagnostic fee that rolls into the final price if you proceed. You’ll get a written quote before any work begins, and that number does not change at the door.
| Service | Price Range in San Francisco |
|---|---|
| Furnace Repair | $175-$825 |
| Heat Pump Repair | $175-$765 |
| Heating Repair | $175-$825 |
| Tune-Up | $95-$235 |
What moves the needle within these ranges? Access matters. A wall furnace buried in a tight Victorian closet takes longer than a basement unit. Parts availability for 50-year-old Williams or Empire units can require special ordering. And coastal corrosion may mean replacing more than just the failed component. We explain all of this on the written quote. Estimates are free. Call (817) 402-2972.
We Also Serve Cities Near San Francisco
Our crews work throughout San Francisco and the immediate Bay Area, including Daly City, Brisbane, Sausalito, and South San Francisco. The same live-answer phones, same written pricing, same 365-Day Done Right Promise apply in every city we serve.
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
If the heat exchanger is cracked or the unit is over 40 years old, replacement is the safer choice. We red-tag cracked exchangers because carbon monoxide risk is real, and parts for 1960s-era Williams units are increasingly scarce. For flats with no ductwork, we often recommend a Daikin or Mitsubishi ductless mini-split, but we upsize the outdoor coil’s corrosion protection because salt air off Ocean Beach destroys standard cabinets in just a few seasons. Call (817) 402-2972 and we’ll inspect it at no charge.
San Francisco’s marine fog carries salt that accelerates corrosion on standard aluminum coils and steel cabinets. The Outer Richmond sits directly in the fog path, so equipment that lasts 15 years inland may show pitting in 3-5 years here. We specify coated or epoxy-coated coils and recommend annual coil cleaning for coastal properties. If you’re replacing the unit, we’ll quote the corrosion-resistant upgrade.
Yes, and in San Francisco it’s really a microclimate calculation. A load calculation measures how much heating and cooling your specific space requires, but here it must account for whether you’re in the fog belt or a warmer pocket. A system sized for the Sunset will be undersized for Noe Valley. We perform Manual J load calculations using neighborhood-specific weather data, not generic San Francisco averages.
Most furnace repairs in San Francisco cost between $175 and $825, including parts and labor. Simple fixes like a thermocouple or ignitor replacement run toward the lower end. Heat exchanger replacement or blower motor work on an inaccessible wall furnace pushes toward the higher end. We hand you a written price before any work starts, and the diagnostic fee applies to the repair if you proceed. Call (817) 402-2972 for a free estimate.
We can diagnose and repair most gas wall furnaces, including Williams and Empire models, if parts are available. In-law units often have the oldest equipment because landlords defer replacement until failure. We’ve found cracked heat exchangers and failed thermocouples in units running 50-plus years. We’ll give you an honest assessment: repair if it’s safe and economical, replace with a modern alternative if it’s not. The written guarantee applies either way.
Ready to get your heat back? Call Coldharbour Heating & Air at (817) 402-2972. A live person answers 24/7, and we’ll get a technician to your San Francisco home with a written price in hand before any work begins.
Written by Victor Mancini, Owner at Coldharbour Heating & Air, serving San Francisco since 2003.