Fast, Reliable Heating & Furnace Across San Francisco
San Francisco’s heating needs are unlike anywhere else in California. A furnace repair in the Sunset District where the fog never quits is a different job than an emergency no-heat call in the Mission during a January cold snap, and we treat them that way. Daniel personally handles every heating and furnace job we take in San Francisco, from the Victorian flats in Noe Valley to the stucco row houses blanketing the Richmond. We’ve spent a decade working on the exact heating systems that dominate this city’s pre-war housing stock, and we carry the parts to fix most furnace problems on the first visit. If your heat is out, call us at (855) 600-3322. Same-day service is available across the city.
Why Northstar Heating & Air San Francisco Is San Francisco’s Preferred Heating & Furnace Company
Daniel Okafor doesn’t delegate your furnace repair to a rotating crew. As owner and lead technician, he’s the person who shows up, diagnoses the problem, and fixes it. That accountability shows in our numbers: 357 customers have left verified reviews averaging 4.9 stars, and most mention Daniel by name.
San Francisco’s housing stock demands specialized knowledge. The in-wall gravity heaters in Chinatown flats, the original floor furnaces in Visitacion Valley, the 1980s gas furnaces crammed into Noe Valley crawlspaces — we’ve worked on all of them. Ten years in this market means we’ve seen how the city’s salt air corrodes ignitors, how steep hillside foundations shift ductwork, and how the Outer Richmond’s persistent dampness affects heat exchanger longevity.
Our response time reflects our footprint. We’re based in San Francisco, not dispatched from San Jose or Oakland. That matters when your furnace fails on a 45-degree January night and your kids are sleeping in jackets.
Our Heating & Furnace Services in San Francisco
Furnace Repair
A dead furnace in San Francisco isn’t just uncomfortable — it can be dangerous when temperatures drop into the 30s overnight. We repair gas furnaces, electric units, and the aging in-wall and floor systems still common in pre-war flats. In the Mission District, we regularly see ignitor failures caused by dust accumulation from nearby construction; in the Sunset, it’s corrosion on flame sensors from decades of marine fog. Daniel carries replacement ignitors, gas valves, flame sensors, and heat exchanger inspection tools on every truck, so most furnace repairs in San Francisco finish in a single visit. Our Heating & Furnace team also coordinates with our heat pump specialists when a repair reveals your system is beyond saving.
Furnace Replacement
Replacing a furnace in San Francisco is rarely straightforward. The city’s Victorian and Edwardian flat stock was built with plaster-and-lathe walls, no duct chases, and no provision for central forced air. If you’re in a Noe Valley Edwardian with an original floor furnace, upgrading to a modern forced-air system typically means routing ductwork through finished ceilings or exposed basement crawlspaces, making labor costs far exceed equipment costs. For many San Francisco homeowners, we also evaluate whether a Heat Pump & Mini Split in San Francisco makes more sense — especially since the city’s 2021 Reach Code effectively prohibits new gas furnace installations in most permit-triggered work. We’ll give you an honest assessment of both paths.
Furnace Tune-Up
San Francisco’s microclimates mean your furnace might run 200 hours one winter and 800 the next, depending on whether you’re in fog-bound Outer Richmond or sun-exposed Potrero Hill. A tune-up from Northstar includes combustion analysis, heat exchanger inspection, gas pressure verification, and burner cleaning — the maintenance that prevents mid-winter failures when every San Francisco AC Repair & Installation company is slammed. We recommend annual service for any gas furnace over 10 years old, which covers most units in San Francisco’s housing stock. A typical tune-up in San Francisco runs $95–$235.
Heat Exchanger Inspection & Replacement
This is the safety-critical component that separates combustion gases from your breathing air. A cracked heat exchanger can leak carbon monoxide, and in San Francisco’s tightly sealed Victorian flats with minimal ventilation, that risk is amplified. Daniel inspects heat exchangers with visual examination, combustion analysis, and borescope cameras when access is limited. If replacement is needed, we’ll show you the crack and explain your options. Heat exchanger replacement in San Francisco typically runs $800–$2,400 depending on furnace accessibility and whether the unit is still under parts warranty. We also coordinate with our Air Quality & Ventilation in San Francisco team to assess whether your home needs additional airflow improvements after the repair.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Francisco
We don’t guess at parts. Daniel is trained and experienced on 9 major HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For San Francisco customers, that means no referral runarounds when your Rheem furnace needs a proprietary control board or your Lennox requires a specific pressure switch. We stock common failure parts for Trane, Lennox, Goodman, and Rheem systems locally, and our supplier relationships get us same-day or next-morning delivery on everything else. One company, 9 brands, no mismatches.
Common Heating & Furnace Problems We See in San Francisco Homes
- Original floor furnace failures in the Sunset and Richmond. Scores of homes still run mid-20th-century Wedgewood or Empire floor furnaces tucked beneath hallway grates. These units often lack modern safety switches and feed off undersized half-inch gas lines that cannot support a modern replacement without a separate gas line upgrade and SFGFD permit.
- Ignitor and flame sensor failures from marine corrosion. The persistent fog and salt air in the Outer Sunset, Outer Richmond, and Parkside accelerate corrosion on furnace ignition components. We replace these with upgraded materials where possible, but annual cleaning is the only real prevention.
- Heat exchanger cracks in 20- to 30-year-old furnaces. San Francisco’s housing turnover means many furnaces from the 1990s and early 2000s are still running in Noe Valley and Castro flats. These units often have heat exchanger warranties that have expired, and the replacement cost approaches that of a new system.
- Undersized gas lines on retrofit jobs. When a Visitacion Valley or Bayview homeowner wants to upgrade from a wall heater to a proper forced-air furnace, the existing gas branch line is frequently too small. We coordinate the gas line upgrade and permitting as part of the project, not as a surprise add-on.
Pricing for Heating & Furnace in San Francisco, CA
San Francisco’s labor costs, permit requirements, and housing complexity push furnace service pricing above national averages. Here’s what we charge:
| Service | Typical Range in San Francisco |
| Furnace Repair | $175–$825 |
| Furnace Tune-Up | $95–$235 |
| Ignitor Replacement | $175–$425 (part + labor) |
| Gas Valve Repair/Replacement | $275–$650 |
| Heat Exchanger Replacement | $800–$2,400 |
What moves you within these ranges? Accessibility is the big one. A furnace in a spacious Daly City-style garage is a 45-minute job; a furnace wedged into a Noe Valley crawlspace with 18 inches of clearance takes three hours just to extract. Parts availability matters too — we stock common components, but a failed control board for a 1990s unit may need to be sourced. We always provide upfront pricing before any work begins, and estimates are free. Call (855) 600-3322 for an exact quote on your specific system.
We Also Serve Cities Near San Francisco
Daniel covers the full city and surrounding neighborhoods without the dispatch delays of companies based outside San Francisco proper. We regularly work in Mission District (where aging in-wall heaters meet new construction dust), Noe Valley (steep access and Edwardian crawlspaces), Chinatown (tight mechanical closets and gravity heater conversions), and Visitacion Valley (original floor furnaces and mid-century stucco homes). Each neighborhood has its own heating quirks, and we know them.
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 — Heating & Furnace in San Francisco
We offer our Emergency & Commercial HVAC in San Francisco with same-day furnace repair for calls received before 2 PM, and emergency service for no-heat situations after hours. Daniel is based in the city, not dispatched from the East Bay or Peninsula, so our average response time to Mission District, Noe Valley, and Richmond addresses is under 90 minutes during business hours. Call (855) 600-3322 and we’ll give you a precise arrival window.
We cover every San Francisco neighborhood from the Presidio to Bayview. That said, our most frequent heating calls come from areas with the oldest housing stock: the Sunset and Richmond districts (original floor furnaces), Noe Valley and Castro (Edwardian flats with retrofit systems), Chinatown and North Beach (in-wall gravity heaters), and Visitacion Valley (mid-century homes with aging gas furnaces). We know the specific permit and access challenges of each.
Yes. We provide emergency HVAC response for no-heat situations, gas odor concerns, and carbon monoxide detector alerts. Daniel personally handles emergency calls, so you’re getting the owner-lead technician, not an on-call subcontractor. Emergency rates apply after hours, but we never charge emergency premiums for calls we can schedule next-day during business hours. If your furnace is out tonight, call (855) 600-3322.
Three factors drive San Francisco pricing: labor costs are among the highest in the nation; permit and inspection requirements add time and fees (especially for gas line work coordinated with SFGFD); and the city’s pre-war housing stock makes access far more difficult than in suburban homes with full basements and generous utility rooms. A furnace swap in a San Jose ranch house takes 4 hours. The same job in a Noe Valley flat with a crawlspace entry takes 8–10.
We warranty our labor for one full year on all furnace repairs, and we pass through manufacturer parts warranties where applicable. For heat exchanger replacements, we verify remaining factory warranty before quoting — some Lennox and Trane units carry 20-year or lifetime heat exchanger coverage that could save you thousands. We document everything in writing before work begins. Call (855) 600-3322 to discuss warranty status on your specific unit.
Written by Daniel Okafor, Owner and Lead Technician at Northstar Heating & Air, serving San Francisco since 2014.