AC repair
Furnace & heating
Heat pumps
Ductless mini splits
Carrier
Trane
GoodmanSeasonal 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.
Get your free estimateFast, Reliable Furnace Repair Across South San Francisco
Furnace repair in South San Francisco typically runs $175 to $825 for most jobs, and the sooner you catch a failing part, the less it costs. We dispatch technicians from our San Francisco Bay Area office to homes across South San Francisco daily, from the flats near Oyster Point to the hillside streets below Sign Hill. If your furnace is short cycling, blowing cold air, or making a sound it never made before, call (559) 245-8807 and a live person answers, day or night. You’ll get a written price before any work starts, and every repair carries a written guarantee.
Why Brandt HVAC Co San Francisco Is South San Francisco’s Preferred Furnace Repair Company
We answer the phone with a person, not a menu. That matters at 6 a.m. on a foggy Tuesday when your furnace quits and the house won’t climb past 58 degrees. Homeowners across South San Francisco call us because we do three things consistently: we tell you exactly who is coming to your door, we give you a written price first, and we stand behind the repair for a full year.
Every technician arrives in uniform, with a photo ID badge shown before crossing your threshold. You’ll know their name and see their photo before they park the van. That’s the Threshold Verified standard, and it’s built for people who don’t like opening the door to strangers. South San Francisco has a lot of those people, and we respect it.
Devin Marlowe, who leads our team, put it simply: a repair isn’t done unless the customer can verify who did it, what it cost, and what’s covered if it fails again. That’s the whole job. Call (559) 245-8807 and you’ll get a real person, a straight answer, and a firm price.
Styles & brands we work with
Boiler Repair in South San Francisco
Boiler repair in South San Francisco is common in mid-century hillside homes where hydronic heat was the original system, and we handle everything from failing circulator pumps to corroded zone valves. A boiler that won’t hold pressure or heat the farthest bedroom often traces back to sediment buildup or a failing expansion tank, both of which we diagnose on the first visit. Most boiler repairs here run between $175 and $825, parts and labor included, with a written price before we touch a fitting.
Circulator Pump and Zone Valve Work
A boiler that heats one room fine and leaves another cold usually has a stuck zone valve or a tired circulator. On South San Francisco’s hillside lots, where homes often have three or four zones, we trace the wiring and test flow before replacing anything. You see the written price first, and the repair is guaranteed for 365 days.
Pressure and Ignition Troubles
Low boiler pressure in older South San Francisco homes often points to a slow leak or a failed pressure-reducing valve. We test the expansion tank, check the relief valve, and tell you exactly what’s leaking and why. If it’s combustion-related, we inspect the burner and pilot assembly, and we never leave a boiler running with unverified flame rollout or gas valve function.
Gas Furnace Repair in South San Francisco
Gas furnace repair in South San Francisco usually starts with the ignitor, flame sensor, or gas valve on mid-efficiency units from the 1980s and 1990s, which are all over this city’s housing stock. We also see high-efficiency condensing units with clogged condensate traps, especially in crawlspace and closet installations where drainage runs were never sloped right. Gas furnace repair here typically runs $175 to $825, and we always confirm combustion safety before we leave.
Ignitor and Gas Valve Issues
If your furnace clicks but won’t fire, the ignitor may be cracked or the gas valve solenoid is failing. On South San Francisco’s older systems, these parts are often original, and we stock replacements for most major brands. We verify the flame sensor microamp reading and gas manifold pressure rather than guessing, so you don’t pay for a part that wasn’t the problem.
Heat Exchanger Inspections
A cracked heat exchanger is a carbon monoxide risk and should never be ignored. In hillside homes near Sign Hill, salt-laden fog accelerates corrosion on heat exchangers that would last decades just three miles inland in San Bruno. We inspect with a combustion analyzer and a visual scope, show you what we see, and give you a written price for replacement if it’s needed.
Trusted Brands We Service in South San Francisco
We repair furnaces and boilers from York, Daikin, Bryant, and American Standard, along with many older units that predate current model lines. Our vans carry common ignitors, flame sensors, pressure switches, and gas valves for South San Francisco jobs, so we finish most calls in one visit. If a part isn’t on the truck, our Bay Area supply network gets it to your neighborhood fast, often the same day. You won’t wait a week for a basic part.
Common Furnace Repair Problems We See in South San Francisco Homes
- Corroded heat exchangers from fog intrusion. Salt-laden marine air works its way into furnaces on and below Sign Hill, corroding metal far faster than in Daly City’s flatlands. We see heat exchangers fail on units less than 12 years old in worst-exposed homes.
- Crushed and leaking ductwork in hillside crawlspaces. Shifting foundations on sloping lots squeeze flex duct, rip connections, and throw off static pressure. Your furnace runs harder and some rooms never get warm.
- Restricted rooftop and closet furnace access. Many South San Francisco homes have furnaces in tight closets or on rooftops, accessed by narrow hillside stairways. Labor time goes up, which is exactly why our written-price model protects you from surprise bills.
- Furnaces running deep into summer. South San Francisco’s foggy summers mean many homes heat in July and August. Parts wear out year-round here, not seasonally, so we stock them all year.
See the difference
Before
After
Before
After
Before
AfterPricing for Furnace Repair in South San Francisco, CA
Furnace repair in South San Francisco costs more than a flatland city like Sacramento because access is tighter and labor runs longer. Here’s what you can expect:
| Service | Typical Price Range |
|---|---|
| Gas Furnace Repair | $175 – $825 |
| Furnace Repair | $175 – $825 |
| Heat Exchanger Replacement | $175 – $825 |
Those prices include parts and labor, and you approve the exact number in writing before any work begins. No hourly billing surprises. If we find something else wrong, we show you first and you decide. Estimates are free. Call (559) 245-8807.
The single biggest cost driver in South San Francisco is access. A furnace in a walk-in closet off a hallway costs less to repair than a rooftop unit reached by a 38-inch-wide hillside stairway. We tell you the price for your exact home, not a citywide average.
We Also Serve Cities Near South San Francisco
Our Furnace Repair team covers South San Francisco proper, and we regularly run calls into Daly City, San Bruno, Pacifica, and parts of San Francisco. If you’re on the edge of South San Francisco and aren’t sure we reach you, call and ask. We probably do.
Serving South San Francisco, CA - Our Local Coverage Area
We’re based in the South 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 South San Francisco
Salt-laden fog off the bay accelerates corrosion on heat exchangers and burner assemblies, and shifting hillside foundations crush ductwork in crawlspaces. We replace more heat exchangers and seal more ductwork on Sign Hill than anywhere else in South San Francisco. If you live on or below the hill, expect your furnace to work harder and fail sooner than a flatland unit, and budget for heat exchanger inspections every few years. Call (559) 245-8807 for a written inspection quote.
Most component-level repairs (ignitors, gas valves, blower motors, pressure switches) do not require a permit. Heat exchanger replacement or any repair that alters gas piping or venting often does, and South San Francisco’s hillside rules can add structural review if the unit sits on a rooftop. We handle the permit paperwork for you and tell you upfront if your job triggers one. Call (559) 245-8807 and we’ll check your address before scheduling.
Yes. South San Francisco has strict noise ordinances, and hillside homes put rooftops close to neighboring windows. We schedule rooftop work during permitted hours, use quiet-access equipment, and keep curb-side staging minimal. If your furnace is on a rooftop, tell us the neighbor’s concerns when you call, and we’ll plan around them. (559) 245-8807.
The Peninsula’s marine layer keeps summer mornings and evenings cool, especially on the west slopes where fog sits until noon. Many South San Francisco homes run heat in July and August, which means furnaces here accumulate run-hours year-round. That’s why annual tune-ups matter more here than in cities with true off-seasons. Call (559) 245-8807 to schedule one.
Leaking, collapsed ductwork in crawlspaces built in the 1950s through 1970s. It throws off static pressure, overheats the heat exchanger, and causes uneven heating. We often find the furnace itself is fine, and the real problem is a crushed return duct under the house. We diagnose the whole system, not just the box in the closet. Call (559) 245-8807 for a full-system check.
Contact Brandt HVAC Co San Francisco for Furnace Repair in South San Francisco
If your furnace is down or running rough, call (559) 245-8807 now. A live person answers, 24 hours a day, every day of the year. You’ll get a written price before any work starts, a technician sent by name and photo, and a repair guaranteed for 365 days. That’s the Brandt standard, and it’s how we work in every South San Francisco neighborhood we serve.
Written by Devin Marlowe, Owner at Brandt HVAC Co San Francisco, serving South San Francisco.