Fast, Reliable Heating & Furnace Across San Francisco
Furnace repair in San Francisco typically costs $175–$825, and most calls we handle in the 94117, 94118, 94119, and 94120 ZIP codes are completed same day. If your furnace won’t start, cycles constantly, or you’re smelling gas near the unit, call us at (877) 454-5066 for a free estimate and honest diagnosis.
We’ve worked on heating systems throughout San Francisco for nearly two decades, from the Victorian flats of Noe Valley to the mixed-use buildings along Mission Street. Anthony Moreno, our founder and lead installer, still shows up on the job personally. That means when you call Meridian Heating & Air, you’re getting an owner-operator who understands how San Francisco’s salt-laden marine air, century-old housing stock, and sharp microclimate swings affect what fails and when.
Why Meridian Heating & Air Los Angeles Is San Francisco’s Preferred Heating & Furnace Company
Our reputation in San Francisco is built on showing up and doing the work right, not on marketing spend. We’ve got 286 verified reviews averaging 4.8 stars, many from homeowners in the Mission District, Potrero Hill, and Nob Hill who needed someone who actually understood their building, not a technician reading from a generic checklist.
Response time matters in San Francisco, especially during late-summer heat dome events or when a failed furnace leaves a family without heat during a fog-heavy January stretch. We route our calls to reach San Francisco neighborhoods directly, and our familiarity with local parking constraints, narrow stairwells in Edwardian flats, and the specific challenges of working around lath-and-plaster walls saves time on every job.
Anthony’s hands-on role means consistency. You won’t get a rotating subcontractor who doesn’t know your system from the last call. You’ll get the same experienced judgment that has guided our company for 19 years, applied to your specific furnace, your specific building, and your specific San Francisco microclimate.
Our Heating & Furnace Services in San Francisco
Our Heating & Furnace team handles everything from emergency repairs to full system replacements across San Francisco’s diverse housing stock. Here’s what we do most often in this market.
Furnace Repair
Furnace repair in San Francisco runs $175–$825 depending on the component and accessibility. The most common calls we get involve ignitor failures from moisture intrusion in bay-facing units, gas valves sticking due to corroded terminals, and blower motors strained by salt-air degradation. In SoMa and the Mission, where afternoon temperatures can spike 15°F above fog-locked neighborhoods on the same day, we also see overheating shutdowns from clogged filters and restricted airflow in older systems.
Furnace Replacement
When a furnace reaches the end of its useful life in San Francisco, replacement requires more than swapping boxes. In Victorian and Edwardian flats built between 1880 and 1915, there’s often no existing ductwork, no chase space in balloon-frame walls, and shared party walls that complicate venting. We’ve replaced furnaces in Noe Valley Victorians where the only viable path was a high-efficiency sealed-combustion unit with dedicated venting through an exterior wall. In newer buildings around SoMa, we can often use conventional forced-air replacement. Either way, Anthony evaluates the structure personally and specifies the right approach for the building, not the easiest sale.
Furnace Tune-Up
A furnace tune-up in San Francisco costs $95–$235 and should happen annually, especially for units exposed to coastal air. Our tune-ups include combustion analysis, gas pressure verification, heat exchanger inspection for corrosion cracking, and coil treatment with marine-grade protectant on bay-facing and ocean-facing exposures. In ZIP codes 94105 and 94111, where salt-laden fog accelerates metal degradation, this treatment isn’t optional, it’s preventive maintenance that can add years to a furnace’s life.
Heat Exchanger Repair & Replacement
Heat exchanger corrosion is the most serious failure mode we see in San Francisco’s coastal zones. Salt air attacks the metal from the outside while combustion byproducts work from the inside, and the result is cracking that can leak carbon monoxide into living spaces. We recently replaced a 15-year-old gas furnace in a Potrero Hill flat where the heat exchanger had rusted through due to decades of salt-laden fog. We installed a Daikin gas furnace with marine-grade coated coils and stainless steel fasteners, and re-routed the fresh air intake to reduce exposure to the coastal breeze. Heat exchanger work requires exacting inspection, and we don’t sign off on a repair unless we’d put our own family in front of that furnace.
Gas Valve Repair
Gas valves in San Francisco fail when corrosion on exposed terminals causes intermittent operation or complete lockout. This is especially common on rooftop and exterior-mounted units in the 94105 and 94111 corridors. We clean, test, and when necessary replace valves with properly sealed components rated for marine exposure. Gas valve work involves live fuel lines, and we always recommend a trained professional, never DIY.
Ignitor Replacement
Hot surface ignitors in bay-facing furnaces absorb moisture from fog and marine layer penetration, leading to premature failure. We stock ignitors for Goodman, Rheem, York, and Daikin systems, and we verify that the replacement includes proper moisture sealing for San Francisco’s specific exposure.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Francisco
We work on your brand, not just the ones we prefer to sell. Our factory training and field experience cover Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For San Francisco customers, this matters because many older buildings still run original equipment from manufacturers no longer common in new construction. We stock parts for Goodman and Rheem systems locally, and our relationships with York and Daikin distributors mean we can get specialized components, including marine-grade coil coatings and corrosion-resistant hardware, without the long lead times that delay other contractors. Whether you need a repair on a 20-year-old Rheem in Visitacion Valley or a full Daikin replacement in Chinatown, we’ve got the parts knowledge and supplier relationships to get it done.
Common Heating & Furnace Problems We See in San Francisco Homes
- Heat exchanger corrosion from salt-laden marine air. In ZIP codes 94105 and 94111, unprotected metal parts fail two to three years sooner than in inland neighborhoods. We inspect for cracking with visual and combustion analysis tools, and we specify marine-grade coated replacements when the original has succumbed.
- Ignitor failure caused by moisture intrusion in bay-facing units. Fog and marine layer penetration degrades hot surface ignitors prematurely. We see this constantly in Nob Hill and North Beach flats with exterior mechanical closets or rooftop units.
- Gas valve sticking due to corrosion on exposed terminals. Salt air attacks electrical connections and solenoid mechanisms. The symptom is intermittent firing or a complete no-start condition, often misdiagnosed as a control board problem by technicians unfamiliar with coastal failure patterns.
- Blower motor and bearing degradation from salt-air exposure. Even indoor components suffer when intake air carries corrosive particulates. In buildings without proper intake filtration or with fresh-air vents facing the bay, we find bearing seizure and winding failure years ahead of manufacturer estimates.
Pricing for Heating & Furnace in San Francisco, CA
| Service | Price Range in San Francisco |
|---|---|
| Furnace Repair | $175 – $825 |
| Furnace Tune-Up | $95 – $235 |
What moves a repair toward the higher end? Accessibility in tight Victorian mechanical closets, specialized marine-grade parts for coastal exposure, and the need for combustion analysis and carbon monoxide verification. Replacement costs vary widely based on whether your building has existing ductwork or requires a ground-up retrofit. We don’t guess over the phone. Call (877) 454-5066 for a free, on-site estimate with upfront pricing before any work begins.
We Also Serve Cities Near San Francisco
Our service area extends throughout the core San Francisco peninsula and into adjacent neighborhoods. We regularly work in the Mission District, where afternoon heat spikes strain aging wall heaters; Noe Valley, with its concentration of Victorian flats needing careful retrofit planning; Chinatown, where tight mechanical spaces and high occupancy demand efficient, compact solutions; and Visitacion Valley, where marine exposure meets hillside wind patterns that accelerate equipment wear. Wherever you are in San Francisco, the same owner-led expertise applies.
Serving San Francisco, CA — Our Local Coverage Area
We’re based in the 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 — Heating & Furnace in San Francisco
Salt-laden marine air accelerates corrosion on outdoor and exposed furnace components, especially in ZIP codes 94105 and 94111, where unprotected metal parts can fail two to three years sooner than in inland neighborhoods. The combination of fog, onshore flow, and narrow building cavities that trap moisture creates a uniquely aggressive environment for heating equipment. Call (877) 454-5066 for a corrosion inspection and protective treatment plan.
Yes, but it requires a different approach than conventional forced-air replacement. San Francisco’s Victorian and Edwardian flats, built between roughly 1880 and 1915, have lath-and-plaster walls, balloon-frame construction, and zero existing duct chases that make forced-air retrofits prohibitively invasive. We typically specify high-efficiency sealed-combustion gas furnaces with dedicated venting, or recommend ductless mini-split heat pumps as a less destructive alternative. Anthony evaluates each building personally to find the right path. Call for a free assessment.
Annually, and we recommend scheduling before the fog season intensifies in October. The salt-air exposure in coastal ZIP codes demands proactive inspection of the heat exchanger, gas valve terminals, and ignitor moisture seals. Our tune-up includes marine-grade coil treatment on exposed units. Call (877) 454-5066 to book a $95–$235 tune-up.
Daikin and York both offer marine-grade coil coatings and stainless hardware options that we specify for bay-facing and ocean-facing installations in San Francisco. However, no brand is immune without proper installation details, intake routing, and annual maintenance. We’ve seen premium units fail early when contractors skipped these steps. The right specification matters as much as the brand name. Call to discuss what works for your specific exposure.
Gas valve cleaning and replacement due to corrosion on exposed terminals, followed closely by ignitor replacement from moisture intrusion. Both failures are directly tied to coastal environmental exposure and are often misdiagnosed by technicians unfamiliar with San Francisco’s specific failure patterns. We’ve handled hundreds of these calls across 19 years. Call (877) 454-5066 for same-day diagnosis.
Ready to get your furnace fixed or replaced by someone who actually knows San Francisco buildings? Call (877) 454-5066 now for a free estimate. Anthony Moreno, our founder and lead installer, still shows up on the job personally, and we’ve got 286 reviews averaging 4.8 stars from homeowners who’ve experienced the difference that owner-operated expertise makes.
Written by Anthony Moreno, Owner at Meridian Heating & Air, serving San Francisco since 2006.