Furnace Repair in San Francisco
Get fast, fair pricing from licensed local pros. Typical San Francisco cost: $100 – $300 installed.
- Flame sensor
- $100 – $300
- Igniter
- $175 – $550
- Blower motor
- $500 – $1.9k
- Control board
- $375 – $1k
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Furnace repair cost by part.
Typical San Francisco repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
In San Francisco, furnace repair costs are shaped by the city's older housing stock (median home built 1945) and strict California energy codes. Typical repairs range from $100–$300 for a flame sensor to $1,850–$4,300+ for a heat exchanger, plus a $90–$250 diagnostic fee. Labor rates reflect the high cost of living (median household income $136,689) and the need for licensed contractors familiar with Title 24 requirements. Given the mild Mediterranean climate, many homeowners consider heat pumps as a replacement option, but repairs on existing gas furnaces remain common. Permits are required for most repairs involving gas or electrical work, adding to the overall cost.
- Diagnostic / service callOften credited toward the repair$90 – $250
- Flame sensor or thermocoupleCommon no-heat cause on gas units$100 – $300
- Hot-surface igniterFurnace clicks but won’t light$175 – $550
- Blower motorNo airflow / weak airflow$500 – $1,850
- Heat exchangerCracked exchanger often means replace$1,850 – $4,300+
* A cracked heat exchanger is a safety issue — on an older furnace, replacement is usually the call.
Pricing reviewed · Local data from U.S. Census ACS
HVAC systems in San Francisco
U.S. Census ACS- Households
- 340,414
- Homeowners
- 139,117
- 34% own
- Median home value
- $1,348,700
- Median income
- $136,689
- Median home built
- 1945
- Housing units
- 408,198
With a median home built in 1945, many San Francisco AC and furnace systems are at or past their 12–15 year lifespan — a common reason replacements spike here.
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What’s different about San Francisco.
Generic cost pages skip the things that actually decide your price and which system fits here — local code, climate, and the money you can claim back.
Recommended unit for San Francisco
Given California’s mild (mediterranean), hot-dry inland climate and gas heating, high-seer2 heat pump is the sensible default for most San Francisco homes. A pro can confirm the right size and system for your home with a load calculation.
Sources: Southwest Region SEER2 New Efficiency Standards · TECH Clean California Single Family Incentives · EIA California State Energy Data
What San Francisco code requires
Installing or replacing an HVAC system in San Francisco follows California rules under the state mechanical code. Here’s what applies statewide:
- PermitRequired
Mechanical permit pulled by your licensed HVAC contractor; covers equipment, refrigerant, and the electrical disconnect.
- SEER2 minimum14.3 SEER2 (Southwest, <45k BTU)
Federal Southwest-region minimum for new split-system AC. Higher tiers cut bills and unlock rebates.
- Load calculationRequired (Manual J)
Sizing by load calc — not rule of thumb — prevents an oversized unit that short-cycles and never dehumidifies.
- RefrigerantR-454B / R-32 (R-410A phased down 2025+)
- Good to know—
CA Title 24 requires HERS-verified duct leakage testing and Manual J sizing on most AC/furnace changeouts
Sources: Southwest Region SEER2 New Efficiency Standards · TECH Clean California Single Family Incentives · EIA California State Energy Data
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Money back in San Francisco
California heating is mostly gas, which shapes the money back:
- State~$1,000 per system (up to 2 systems / $2,000 per home), market-rateTECH Clean California - Single Family Heat Pump HVAC Incentive →
State or utility program — verify eligibility before you buy.
- Federal30% of cost, up to $2,000Federal 25C tax credit — heat pump →
For a qualifying ENERGY STAR heat pump meeting the CEE efficiency tier. Claimed on your federal return.
The federal 25C tax credit (30%, up to $2,000 for a qualifying heat pump and up to $600 for a high-efficiency central AC) applies in every state.
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- 1
Tell us what’s wrong
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- 2
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- 3
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Your pro confirms the price on-site and gets your comfort back. Most jobs done in a few hours.
Furnace Repair in San Francisco, explained.
What Drives Furnace Repair Costs in San Francisco?
Prices vary primarily due to the age of the home—older ductwork and systems may require more labor. The need for a mechanical permit (typically $150–$400) and HERS-verified duct leakage testing under Title 24 can add to the bill. The specific part failing (e.g., control board vs. heat exchanger) and the contractor's overhead in a high-cost city also influence pricing. Seasonal demand (winter) and the complexity of accessing units in tight spaces common in San Francisco homes further affect quotes.
Common Furnace Problems in San Francisco
Igniter Failure
The igniter is a common wear item in older furnaces; replacement costs $175–$550.
Flame Sensor Malfunction
A dirty or faulty flame sensor can cause the furnace to short-cycle; repair typically runs $100–$300.
Blower Motor Issues
Blower motor failure reduces airflow; replacement costs $500–$1,850, often due to age or debris.
What to Expect During a Furnace Repair
A technician will first perform a diagnostic ($90–$250) to identify the issue. For most repairs, a mechanical permit is required, and the contractor will handle that. Work may include replacing parts like the igniter or blower motor, followed by testing to ensure proper operation. If the system is older, the technician may recommend a heat pump replacement to comply with future refrigerant rules.
Furnace Repair FAQs — San Francisco
Yes, California requires a mechanical permit for most furnace repairs involving gas or electrical work. Your contractor typically includes the permit fee in the quote.
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