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AfterHow Much Does Furnace Replacement Cost in San Francisco?
A full furnace replacement in San Francisco typically costs between $4,130 and $8,850, with most homeowners spending around $5,800 to $6,900 for a mid-efficiency unit installed by a licensed contractor. That price includes the furnace itself, labor, permits, and removal of the old unit. The final number depends on your home’s layout, furnace efficiency rating, and any ductwork or venting modifications needed.
San Francisco’s housing stock presents unique cost drivers you won’t see in the East Bay or South Bay. Many homes in the Richmond, Sunset, and Noe Valley are older Victorians or mid-century builds with tight mechanical closets, plaster walls, and original ducting that may need adaptation. If your home has a furnace tucked into a hall closet or under a stairwell, expect labor to run higher because technicians need more time to maneuver the unit in and out.
We’ll break down exactly where your money goes, what San Francisco-specific factors push prices up or down, and how to get a furnace replaced without surprises. Every number on this page reflects what we’re seeing in the city in 2026.
Furnace Replacement Cost Breakdown (2026)
Here’s the direct answer: a complete furnace replacement in San Francisco runs $4,130 to $8,850, parts and labor included. That’s the range we quote most often for standard residential jobs. Higher-end high-efficiency installations with significant venting or ductwork modifications can push toward $12,000, but those are the exception rather than the rule.
Here’s what the line items look like for a typical mid-range replacement in San Francisco:
| Cost Item | Typical Range (San Francisco, 2026) |
|---|---|
| Furnace unit (80% AFUE, 60,000 – 80,000 BTU) | $1,800 – $3,200 |
| Furnace unit (96%+ AFUE, high-efficiency) | $2,800 – $4,800 |
| Installation labor (including old unit removal) | $1,500 – $2,800 |
| Permit and inspection fees (City of San Francisco) | $250 – $650 |
| Ductwork adaptation or minor modifications | $300 – $1,200 |
| New venting, flue liner, or intake piping | $200 – $1,000 |
| Thermostat replacement (if not existing compatible) | $80 – $350 |
| Line voltage/gas line adjustments | $150 – $650 |
Those labor figures assume straightforward access. In neighborhoods like the Marina, Pacific Heights, and Russian Hill, where furnaces are often in basements, crawlspaces, or converted garages, technicians may need extra time for tight access. Homes with finished basements that hide ductwork behind drywall also cost more, because opening and patching walls adds labor.
The single biggest driver is the efficiency rating. An 80% AFUE furnace costs less up front but burns 20 cents of every fuel dollar as waste. A 96% AFUE condensing furnace costs more to buy and install but qualifies for PG&E rebates and BayREN incentives, which can offset $300 to $1,500 depending on the program year. In San Francisco’s mild climate, both work; the choice comes down to how long you plan to stay in the home and whether you want the lower monthly bill.
What Affects Furnace Replacement Pricing in San Francisco
- Furnace location and access. A furnace in a basement with walk-in access costs less to replace than one in a crawlspace, attic, or tight hall closet. In many Sunset and Richmond district homes, the furnace sits in a garage or a small utility closet near the back door, and maneuvering the old unit out and the new one in adds 1 to 2 hours of labor.
- Fuel type. Natural gas furnaces are the standard in San Francisco and PG&E territory. Electric heat pump conversions are becoming more common due to local electrification ordinances, and those run $5,000 to $14,000 installed, which is a different project entirely. Some older homes still have propane, which is now rare in city limits.
- Efficiency rating (AFUE). An 80% AFUE furnace is the budget option. A 96% or 97% AFUE condensing furnace costs $1,000 to $1,600 more for the unit itself, plus additional venting and a condensate drain line. The payback in San Francisco is longer than in colder climates, so if you don’t plan to stay 8+ years, the 80% unit may make more sense.
- Ductwork condition. San Francisco homes built before the 1960s often have undersized or uninsulated ducts. If airflow testing shows leaks or if the existing ducts can’t handle the new furnace’s blower, you’re looking at $500 to $2,500 in duct sealing or modification. Homes in the Excelsior and Outer Mission, where many houses date from the 1920s and 1930s, frequently need this work.
- Permit requirements and city inspections. San Francisco requires a mechanical permit for furnace replacement, and the Department of Building Inspection schedules an inspection after the work is done. Permit fees run $250 to $650 depending on the scope. A contractor who skips the permit is breaking city code, and unpermitted work can create title problems when you sell.
- Time of year. Prices don’t shift dramatically in San Francisco the way they do in Minneapolis or Boston, but September through November sees more demand as residents turn on their heat for the first time. Scheduling in spring or early summer may give you more flexibility on install dates, though the price difference is usually under 10%.
How Furnace Replacement Works: What to Expect
If you’re replacing a furnace for the first time, here’s the step-by-step of what happens. Most San Francisco replacements take 4 to 8 hours on site, plus a follow-up inspection by the city.
The Standard Process
- Quote and site review. A technician arrives, measures your home’s square footage, checks the existing furnace’s BTU rating and flue, and assesses ductwork. You get a written price before any work is scheduled. At Brandt HVAC, that written price is non-negotiable and given before work starts on every single job.
- Permit application. Your contractor files a mechanical permit with the San Francisco Department of Building Inspection. This typically takes 1 to 3 business days to process.
- Old furnace removal. The old unit is disconnected from gas, electric, and venting, then hauled away. Removal and disposal are usually included in the quoted price.
- New furnace installation. The new unit is set in place, connected to the gas line and electrical supply, and attached to new or existing venting. If converting to a high-efficiency condensing furnace, the installer runs a new PVC intake and exhaust pipe and adds a condensate drain.
- Duct connections and sealing. The installer connects the furnace to existing ductwork and seals the joints with mastic or foil tape. Here’s where older San Francisco homes benefit from a blower-door test to find leaks.
- Startup and commissioning. The technician fires the furnace, checks gas pressure, flue draft or combustion readings, temperature rise across the heat exchanger, and airflow. You should see a measured temperature difference of 35 to 65 degrees between supply and return air.
- City inspection. The Department of Building Inspection sends an inspector to verify the work meets code. The inspection is scheduled a few days after installation.
Throughout this process, you should know exactly who is in your home. At Brandt HVAC, every technician who arrives is background-checked, uniformed, and sent to you by name and photo before the visit. They show photo ID at the door, no exceptions. That’s the Threshold Verified standard, and it’s part of every appointment we run.
How to Save on Furnace Replacement
Furnace replacement is a big purchase, but San Francisco homeowners have several practical ways to keep the final bill down without cutting corners.
- Replace in the off-season. Spring and early summer are the slowest months for heating work in San Francisco. Some contractors offer small discounts or more scheduling flexibility from March through July. It’s not dramatic, but if your furnace is aging and you have a choice between November and April, April wins.
- Take advantage of rebates. BayREN and PG&E run energy-efficiency rebate programs that pay back $300 to $1,500 for qualifying high-efficiency furnace installations. These programs change yearly, so check what’s active before you commit. A good contractor will know the current rebate landscape, not just the base price.
- Bundle with duct sealing. If your ducts need sealing anyway, doing it at the same time as the replacement saves a second trip charge and often reduces the per-project cost by 10% to 20% compared to scheduling them separately.
- Get multiple written quotes. San Francisco has a wide spread in HVAC pricing because labor rates and overhead vary significantly between sole operators and larger firms. Get at least three written estimates. The cheapest quote is not always the best, but having three real numbers tells you where the market actually sits.
- Ask about financing. Several San Francisco HVAC companies offer 0% interest financing for 12 to 24 months on full replacements. If you’re not paying cash, this can save more than any rebate.
And the simplest one: get a free estimate and a written price before you commit to anything. At Brandt HVAC, you’ll get a written quote with no obligation, and you can call us at (559) 245-8807 to schedule one. No gimmicks, no pressure, and no work starts until you’ve seen and approved the price in writing.
Furnace Repair vs. Replacement: Which Makes Sense?
Here’s a rule of thumb we share with San Francisco homeowners: if your furnace is under 12 years old and the repair costs less than 30% of a new unit, repair it. If the repair runs more than that, or the furnace is over 15 years old, replacement usually wins on the math.
Furnace repair in San Francisco runs $175 to $825, depending on what’s wrong. A failed igniter is a $150-$300 fix. A cracked heat exchanger is a $1,500 to $2,500 repair and usually triggers a replacement conversation because by the time you fix the heat exchanger, you’ve invested more than half the cost of a new furnace in an aging unit.
Replacement cost sits at $4,130 to $8,850. The crossover point is about 5 to 6 major repairs in the life of an older furnace, which most furnaces never see before age 15. If your furnace is 18+ years old and needs any repair above $500, replacement is the better financial decision.
One San Francisco specific note: many older homes in the Glen Park, Bernal Heights, and Potrero Hill neighborhoods still have standing-pilot furnaces from the 1980s or earlier. These units are inefficient, difficult to source parts for, and should be replaced rather than repaired if anything significant fails.
Choosing the Right Furnace for a San Francisco Home
San Francisco’s climate is mild. Average winter lows hover around 46 to 50 degrees. You don’t need a furnace sized for a Chicago winter. In fact, many San Francisco furnaces are oversized for the actual heating load, which leads to short cycling, uneven temperatures, and wasted gas.
Here’s what we recommend for most city homes:
- 2,000 sq. ft. or smaller (typical Sunset, Richmond, Mission, Castro): A 60,000 to 80,000 BTU furnace at 80% AFUE is almost always enough. Going bigger doesn’t heat the home faster, it cycles on and off more often and wears the heat exchanger faster.
- Larger homes or those with high ceilings (Pacific Heights mansions, Noe Valley larger Victorians): 80,000 to 100,000 BTU at 80% to 96% AFUE, with zoning if the home has more than two floors.
- Homes considering electrification: San Francisco’s climate action goals are pushing toward heat pump conversions. A heat pump replaces both furnace and AC. It’s more expensive up front ($5,000-$14,000 installed) but can eliminate your gas bill entirely and qualifies for larger rebates.
Brandt HVAC services all major residential brands, including Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. We’ll recommend the right size and efficiency for your specific home, not whatever unit is sitting in the warehouse.
FAQs – Furnace Replacement Cost
How much does it cost to replace a furnace in San Francisco in 2026?
A furnace replacement in San Francisco costs $4,130 to $8,850 for a standard residential installation, including the unit, labor, permits, and old furnace removal. High-efficiency units with significant duct or venting modifications can run up to $12,000. Call (559) 245-8807 for a written quote specific to your home.
Is it cheaper to repair or replace a furnace?
If your furnace is under 12 years old and the repair is under $500 (like an igniter at $150-$300, or a flame sensor cleaning at $100-$200), repair wins. If the repair exceeds $1,500 (heat exchanger, blower motor, gas valve) on a furnace older than 15 years, replacement at $4,130 to $8,850 is the better long-term play. Call (559) 245-8807 and we’ll give you honest numbers on both paths.
How long does a furnace replacement take in San Francisco?
Most furnace replacements in San Francisco take 4 to 8 hours on site, plus a city inspection scheduled 3 to 10 days later. If ductwork modifications are needed, plan for a second day. We schedule replacements Monday through Saturday and always give you a written time window before the crew arrives.
Do I need a permit to replace a furnace in San Francisco?
Yes. The City of San Francisco requires a mechanical permit for furnace replacement, which costs $250 to $650 and includes a Department of Building Inspection inspection after installation. Any contractor who offers to skip the permit is putting you at risk of city fines and title problems when you sell. We handle the permit paperwork as part of every replacement.
Can I replace my furnace the same day?
In most cases, no. Same-day emergency furnace repair is available in San Francisco, but a full replacement requires a permit, parts ordering, and scheduling. The typical timeline is 3 to 10 business days from quote to completed inspection. If your furnace is down and you can’t wait, we offer emergency repair at $175 to $825 to keep you running while the replacement is scheduled. Call (559) 245-8807 and a live person will answer, 24/7.
What is the most reliable furnace brand for a San Francisco home?
In our experience maintaining and replacing furnaces across San Francisco, Carrier, Trane, and Lennox consistently deliver strong performance and parts availability. Goodman and Rheem are solid budget options. The brand matters less than the installation quality and sizing. A properly sized Goodman will outperform an oversized Carrier every time. We install and service all of them, including York, Daikin, Bryant, and American Standard.
What Our Guarantee Covers
Every furnace replacement from Brandt HVAC Co San Francisco includes a written guarantee. Here’s exactly what it says: if any part of the installation fails within 365 days, we return and fix it at no charge. That’s the 365-Day Done Right Promise. No arguing, no pro-rated charges, no “well, that’s not covered.” If it’s not done right, we make it right. Simple.
Furnace manufacturer warranties are separate and typically run 5 to 10 years on parts, and up to lifetime on heat exchangers for some brands. We register your unit’s warranty with the manufacturer on your behalf, because most manufacturers void the full warranty if the unit isn’t registered within 60 days of installation.
And one more thing about the people we send to your home. Every technician who works for Brandt HVAC is background-checked and identity-verified under the Threshold Verified standard. Before every visit, you’ll receive the technician’s name and photo. They’ll show a photo ID badge at your door. If someone arrives who you were not told to expect, that visit is on us and we make it right. That’s the standard Devin Marlowe set for this company, and it doesn’t waver.
Get a Written Furnace Replacement Quote in San Francisco
If your furnace is aging, failing, or you’re just planning ahead, the first step is a free estimate. We’ll send a background-checked, uniformed technician to your home, measure the space, check the existing setup, and write you a quote you can look at before you decide anything. No pressure, no surprise charges, no work until you approve the price in writing.
Call (559) 245-8807 to schedule your free estimate. A live person answers 24 hours a day, 7 days a week. Nights, weekends, holidays, it doesn’t matter. You’ll get a real human on the line, not a voicemail.
We also provide Furnace Replacement in San Francisco services across the city, from the Outer Sunset to Bayview, and we’re ready to help you get a warm home at a fair, written-up-front price.
Pricing reflects the San Francisco market as of 2026. Brandt HVAC Co San Francisco offers free estimates – call (559) 245-8807.
Written by Devin Marlowe, Owner at Brandt HVAC Co San Francisco, serving San Francisco since 2003.
What Our Customers Say
"Very thorough check on the whole system before summer. Found a worn belt and swapped it for cheap."
- Jerome F."Frozen evaporator coil in July. Cleaned it, replaced a clogged filter, and checked the airflow. Gave me a simple schedule for filters."
- Hannah L."Furnace short cycled all winter. He found a dirty flame sensor and cleaned it. Twenty minutes and a small bill."
- George Q.