Furnace Repair in San Francisco, California
A furnace repair visit in San Francisco, CA usually costs $210 to $910. Where you land depends on the part. A flame sensor cleaning or a new ignitor sits at the low end, while a blower motor or control board pushes the bill toward the top.
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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.
Symptoms Worth a Service Call
- The blower won't stop running
- The thermostat calls for heat and nothing happens
- A yellow or flickering flame instead of a steady blue one
- Banging, squealing or rattling from the furnace
- Cold air coming out of the vents
What Moves the Price
- The diagnostic or service call fee
- Which part failed: a flame sensor costs far less than a control board or blower motor
- Night, weekend or holiday rates
- Whether the part is still under the manufacturer warranty
- The furnace's age and brand, which affect parts availability
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
- A diagnostic check
- Replacing the part that failed
- A safety and combustion check
- A test run through a full heating cycle
California Licensing and Efficiency Rules
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. A repair usually goes ahead without a permit, but the tech handling refrigerant must hold EPA 608 certification. Ask the company for its California license or registration number before the visit.
Before You Hire
- If the furnace is past 15, ask the tech to price both a repair and a replacement.
- Check the filter, the thermostat batteries and the breaker first. Those three cause a surprising number of no-heat calls.
- Ask whether the diagnostic fee comes off the repair bill.
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Furnace Repair Questions from San Francisco Homeowners
What does furnace repair cost in San Francisco?
Most bills land between $210 and $910, including the service call. A typical visit is about $600. Night and weekend calls cost more.
What is the most common furnace repair?
Cleaning a dirty flame sensor or replacing a cracked hot-surface ignitor. They're also two of the cheapest repairs.
Should I repair or replace my furnace?
Here's a rule many techs use: multiply the furnace's age by the repair quote. If the number is over $5,000, replacing it usually makes more sense.
Furnace Repair Near San Francisco
- San Jose $200 to $850
- Fresno $140 to $620
- San Diego $190 to $820
- Sacramento $160 to $700
- Los Angeles $180 to $780
- Long Beach $170 to $740
- Oakland $200 to $860
- Bakersfield $150 to $640
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.