Furnace Replacement Cost in San Francisco, California
Our 2026 estimate for furnace replacement in San Francisco, CA is $4,500 to $10,900. That puts San Francisco 40% above the national average, mainly because of higher incomes and home values, which push labor rates up.
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San Francisco Weather and HVAC Load
In a normal year, San Francisco racks up 3,260 heating and 29 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in San Francisco put in far more hours than the air conditioner. Temperatures stay mild year-round: freezing nights and 90°F days are both rare. For a 2,000 sq ft house, this climate points to a heating load somewhere near 45,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 3,260 |
|---|---|
| Cooling degree days / year | 29 |
| Nights at or below 32°F | 1 |
| Days above 90°F | 1 |
| Average low / high | 50.6°F / 61.7°F |
San Francisco Housing Stock
Census figures put the median build year in San Francisco at 1945, so a typical house here has about 81 years on it. Houses that old often still have duct runs sized for an old coal or oil furnace and 60- or 100-amp electrical panels. Both can add cost when new equipment goes in. About 140,000 households here own their home, 38.5% of the occupied total. Homes here have a median value of $1,380,500 and households a median income of $141,446. Those two numbers drive the labor adjustment in our estimate.
San Francisco County had 3 hail days and 4 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. Storms here are more likely to cause power surges than coil damage, so a surge protector on the outdoor unit is worth the small cost.
When Replacement Makes Sense
- A tech found a cracked heat exchanger, or the CO detector has gone off
- Gas or electric bills keep climbing even though usage hasn't changed
- A repair quote runs past a third of the cost of a new unit
- Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
What Moves the Price
- Single-stage, two-stage or modulating gas valve
- Condition of the existing ductwork and any changes it needs
- AFUE rating: a basic 80% unit vs. a 96% condensing furnace
- BTU size, which should come from a Manual J load calculation
- New PVC venting if you move to a condensing model
- Permit and inspection fees, which the local building department sets
We raised the national figures about 40% for San Francisco using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- The permit and the manufacturer warranty registration
- Combustion and safety tests
- Gas line and vent connections
- Removing and hauling away the old furnace
- The new furnace, filter rack and thermostat wiring
California Permits, Efficiency Rules and Rebates
California is in the DOE's Southwest region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). The Southwest also sets a minimum EER2, which measures efficiency at peak heat. Plan on a mechanical permit for most replacements in San Francisco; the contractor normally pulls it. Before you sign, ask each bidder for their California license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Replace it in early fall if you can. A no-heat emergency in January costs more and leaves you fewer choices.
- Ask for the Manual J load calculation in writing. Oversized furnaces are the most common mistake we see.
- Make sure all three quotes are for the same AFUE and staging, or you can't compare them.
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Furnace Replacement Questions from San Francisco Homeowners
How much is furnace replacement in San Francisco?
Plan on $4,500 to $10,900, with most jobs near $8,000. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule furnace replacement in San Francisco?
Between late spring and early fall. San Francisco averages 1 freezing nights a year, and heating calls spike from November through February.
How long does a furnace replacement take?
A straight swap is usually done in one day, somewhere between 4 and 10 hours. Moving to a condensing furnace with new PVC venting can add a few more.
Is a high-efficiency furnace worth it?
In cold climates, a 95%+ AFUE furnace usually earns back the price difference in lower gas bills. Where winters are mild, the payback can take a very long time.
Furnace Replacement Near San Francisco
- San Jose $4,200 to $10,200
- Fresno $3,100 to $7,500
- San Diego $4,000 to $9,800
- Sacramento $3,400 to $8,400
- Los Angeles $3,800 to $9,300
- Long Beach $3,700 to $8,900
- Oakland $4,200 to $10,300
- Bakersfield $3,200 to $7,700
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station San Francisco Oceanside; NOAA Storm Events Database 2020-2025, San Francisco County. Prices are our estimates, not contractor quotes. Updated 2026.