Fast, Reliable Heating & Furnace Across San Rafael
Heating & furnace repair in San Rafael typically runs $150–$700, with most calls completed same-day by our team. Furnace replacement in San Rafael ranges from $3,500–$7,500 depending on whether your home needs new ductwork alongside the unit. We’re Stonegate Heating & Air California, and we’ve been sending our Heating & Furnace team across the Richmond-San Rafael Bridge and up 101 into Marin for 16 years. Jason Trent, our owner and Field Supervisor, personally oversees the jobs we run in San Rafael’s Terra Linda ranches, Canal-area bungalows, and western hillside homes. We know the 94903 microclimate hits 95–100°F while Fairfax stays foggy, and we know what that heat does to 1960s flex duct in attics that top 130°F. Call (855) 467-1888 for a free estimate — we’ll answer your questions directly and show up prepared.
Why Stonegate Heating & Air California Is San Rafael’s Preferred Heating & Furnace Company
We’ve earned 499 verified reviews at a 4.7-star average across 16 years in California’s HVAC market. San Rafael homeowners find us because they’ve already been through the revolving-door technician experience, and they want someone accountable on their property. Jason Trent doesn’t delegate from a back office — he’s the Field Supervisor on jobs, which means company leadership is physically present when we’re replacing a furnace on Las Gallinas Avenue or tuning up a system in the Gerstle Park neighborhood.
Our familiarity with San Rafael’s housing stock saves time and money. We know Terra Linda’s 1958–1975 ranch homes were built with gravity furnaces and sheet-metal ductwork never designed for modern forced-air systems. We know Canal-area pre-war buildings often have wall heaters or radiant systems with no ductwork at all. That knowledge means we arrive with the right materials and the right expectations, not a generic diagnostic checklist.
We’re certified on nine leading brands — Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard — so we never tell a San Rafael homeowner “we don’t service that brand.” From a single-room mini split to a full commercial system, one team handles it.
Our Heating & Furnace Services in San Rafael
Furnace Repair in San Rafael
Most furnace repair calls we get from San Rafael come from Terra Linda and the eastern flatlands, where original 1960s systems are finally failing after decades of use. A typical furnace repair in San Rafael runs $150–$700. Common issues we see: failed ignitors from thermal cycling, cracked heat exchangers in units that ran hard through Diablo wind events, and gas valve problems in aging floor furnaces. We stock parts for Carrier, Bryant, and American Standard systems locally, which keeps most repairs to a single visit.
Furnace Replacement in San Rafael
This is where San Rafael’s local conditions really matter. In Terra Linda’s 1960s ranches, we’ve learned to inspect ductwork before quoting any furnace replacement. Last fall we serviced a 1965 ranch on Las Gallinas Avenue in Terra Linda. The homeowner complained their new furnace never got the house above 65°F. Our tech found the original sheet-metal plenum had corroded through and the flex duct in the attic was partially collapsed from extreme heat. We replaced the ductwork with insulated rigid metal, sealed every joint with mastic, and then the furnace delivered proper warmth — all in one trip, as we knew the Terra Linda microclimate would demand that level of prep. Furnace replacement in San Rafael runs $3,500–$7,500; if ductwork replacement is needed, we’ll tell you upfront, not after installation.
Furnace Tune-Up in San Rafael
Even in San Rafael’s mild coastal climate, annual furnace tune-ups matter. The $80–$200 service pays for itself in efficiency and longevity, especially for systems that sit idle through summer then fire hard during October Diablo wind events. Our tune-up includes combustion analysis, heat exchanger inspection, gas pressure verification, and duct leakage assessment. For Terra Linda homes with original ductwork, that duct check is non-negotiable — we’ve found collapsed flex duct in attics that owners didn’t know existed.
Heat Exchanger Repair & Replacement in San Rafael
Cracked heat exchangers are a safety issue we take seriously. In San Rafael, we see accelerated heat exchanger failure in two scenarios: furnaces that ran excessively during unseasonably hot fall days when homeowners fired them up against Diablo wind chill, and units in western hillside homes where attic heat warped vent piping and stressed the exchanger. We don’t patch heat exchangers — we replace them or recommend full furnace replacement depending on unit age and condition. Call (855) 467-1888 and we’ll inspect it properly.
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 Rafael
We’re factory-trained or experienced on nine major HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For San Rafael customers, this means no “we don’t service that brand” dead end. We stock common Bryant and American Standard parts for faster turnaround on 94901 and 94903 calls, and our familiarity with Daikin’s variable-speed systems helps us size equipment correctly for San Rafael’s microclimatic variations — a full split system for Terra Linda’s heat, something more modest for western hillside addresses that rarely need cooling.
Common Heating & Furnace Problems We See in San Rafael Homes
- Collapsed flex duct in Terra Linda attics. Original 1960s sheet-metal ductwork in Terra Linda ranches was never designed for air conditioning and often has massive leakage or collapse, so a new furnace without duct replacement wastes capacity. During Diablo wind events, attics exceed 130°F and accelerate deterioration.
- Undersized new systems in homes with degraded ductwork. A furnace rated for 80,000 BTU delivers maybe 50,000 BTU if 35% leaks into an unconditioned attic. We size by delivered capacity, not nameplate rating.
- Pre-war wall and floor furnaces in Canal-area bungalows. In Canal-area pre-war bungalows (94901), wall or floor furnaces are so old that replacement means building new ductwork from scratch, which many homeowners underestimate in cost and scope. We explain this clearly before quoting.
- Heat exchanger damage from attic heat and vent warping. During Diablo winds, unsealed attic penetrations in western hillside homes let fire embers and heat into the attic, warping furnace vent piping and damaging heat exchangers. We inspect vent integrity on every fall service call.
Pricing for Heating & Furnace in San Rafael, CA
Here’s what San Rafael homeowners can expect to pay for heating & furnace work:
| Service | Price Range in San Rafael |
|---|---|
| Furnace Repair | $150–$700 |
| Furnace Replacement | $3,500–$7,500 |
| Furnace Tune-Up | $80–$200 |
What moves the needle within these ranges? Ductwork condition is the big one in San Rafael. A furnace replacement in Terra Linda with intact ductwork sits at the lower end; the same job with full duct replacement runs higher. Brand selection matters too — a single-stage Goodman costs less than a variable-speed Carrier. We don’t quote over the phone for replacements because duct inspection changes everything. Estimates are free, and we’ll show you exactly what we found. Call (855) 467-1888 to schedule.
We Also Serve Cities Near San Rafael
Our Heating & Furnace team regularly works in San Anselmo, Fairfax, Lucas Valley-Marinwood, and Kentfield. Each has different housing stock and microclimate conditions than San Rafael — Fairfax’s foggy exposure means lighter heating loads, while Lucas Valley-Marinwood’s 1970s–80s builds often have better original ductwork than Terra Linda’s 1960s ranches. We adjust our approach accordingly.
Serving San Rafael, CA — Our Local Coverage Area
We’re based in the San Rafael 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 Rafael
Usually yes, and skipping this step is the most expensive mistake we see in San Rafael. Original 1960s flex duct in Terra Linda attics is often partially collapsed or separated at joints from decades of 130°F+ heat exposure, which can rob a new furnace of 30–40% of its capacity before it even reaches the registers. Marin County requires HERS duct leakage testing on replacements, so we’ll know the exact leakage rate before we start. Call (855) 467-1888 and we’ll inspect your ductwork for free with your replacement quote.
Yes, because mild winters mean furnaces sit idle for months, then fire hard during October Diablo wind events when temperature swings hit hardest. The $80–$200 tune-up catches cracked heat exchangers, corroded plenums, and gas pressure issues before they become safety hazards or mid-winter failures. For Terra Linda homes specifically, we include attic duct inspection because collapsed flex duct won’t announce itself until you’re cold. Call (855) 467-1888 to schedule before the fall rush.
San Rafael’s inland valley position creates one of the sharpest microclimatic gradients in Marin County. The Terra Linda flatlands and east-facing hillsides see genuine winter chill and summer heat loads that justify full-capacity systems, while western hillside addresses in the same ZIP may need heating only a handful of days per year. We size equipment by neighborhood microclimate rather than relying on county-wide degree-day averages. A furnace that’s right for Gerstle Park might be oversized for a western hillside home, and vice versa.
Intermittent ignitor failure is common in older San Rafael furnaces that short-cycle due to restricted airflow from collapsed ductwork or dirty filters. The ignitor heats, fails to light properly, cools, and repeats — thermal cycling accelerates wear. In Terra Linda specifically, we’ve traced repeated ignitor failure back to duct collapse causing the high-limit switch to trip. Replacing the ignitor without fixing the airflow problem means you’ll replace it again. We diagnose the root cause, not just the symptom.
Yes, and infrequent use can actually mask the problem until it becomes dangerous. Heat exchangers in San Rafael fail from thermal stress during hard-start cycles after long idle periods, and from corrosion in humid coastal attics. During Diablo winds, attic heat warps vent piping and stresses the exchanger further. A cracked exchanger leaks carbon monoxide. We inspect heat exchangers with cameras on every tune-up and repair call — no exceptions. If yours is cracked, we’ll show you the image and explain your options clearly.
Ready to talk about your San Rafael heating & furnace needs? Call Stonegate Heating & Air California at (855) 467-1888 for a free estimate. Jason Trent or a supervised member of our team will answer your questions directly and schedule a time that works.
Written by Jason Trent, Owner and Field Supervisor at Stonegate Heating & Air California, serving San Rafael and Marin County since 2008.