Fast, Reliable Heating & Furnace Across San Lorenzo
Heating and furnace repair in San Lorenzo typically costs $150–$700 for repairs and $80–$200 for tune-ups, with most service calls completed same-day by our Heating & Furnace team. We’re based in San Jose and regularly route to San Lorenzo’s 94580 zip code, usually arriving within 45 minutes to an hour for standard calls and faster for emergencies along Hesperian Boulevard or Lewelling Boulevard. Call (844) 560-6978 for a free estimate.
San Lorenzo’s housing stock is unlike anywhere else in the East Bay. David Bohannon’s post-WWII planned community built nearly every home here between 1945 and 1960 with floor furnaces or wall heaters — not central forced air. That means nearly every modern HVAC installation is a retrofit into a home never designed for ductwork. We’ve spent 19 years navigating those tight crawlspaces and low-pitch attics. Owner Marcus Feldman still manages every job personally, so the technician who shows up at your door on Via Alamitos or Fresno Avenue knows exactly what your Bohannon tract home needs.
Why Crestview Heating & Air California Is San Lorenzo’s Preferred Heating & Furnace Company
Our 4.8-star rating across 250+ reviews reflects real work in communities like San Lorenzo, not cherry-picked testimonials. Customers here mention our familiarity with their floor furnace conversions and our willingness to explain options without pressure.
Because San Lorenzo sits in unincorporated Alameda County, all HVAC permits route through the Alameda County Building Department — not a city office. Out-of-area contractors routinely stumble on this workflow, causing delays of a week or more. We’ve pulled dozens of permits through that county system. We know the inspectors, the scheduling quirks, and the documentation they want to see. That local permitting fluency translates directly into faster project starts for San Lorenzo homeowners.
Response time matters when your furnace quits on a January night. From our San Jose base, we reach San Lorenzo’s neighborhoods — from the older tracts near San Lorenzo Park to the homes along Washington Avenue — well within our standard service window. Emergency calls get prioritized, and we carry parts for the brands most common in these post-war homes.
Marcus Feldman doesn’t delegate to a call center. As both owner and Service Manager, he reviews every San Lorenzo job before dispatch and often arrives on-site himself. That’s ownership-level accountability built into daily operations, not just marketing copy.
Our Heating & Furnace Services in San Lorenzo
Furnace Repair
Furnace repair in San Lorenzo runs $150–$700 depending on the component and accessibility. The most common calls we get involve original floor furnaces in Bohannon homes where decades of Bay air exposure have corroded heat exchangers, gas valves, or ignitors. The marine layer that rolls in from San Francisco Bay carries salt that accelerates rust on steel components — we’ve seen heat exchangers crack 5–7 years sooner than inland equivalents. When we repair these systems, we inspect for carbon monoxide leaks and document findings for your safety. For homes along the flatter streets near Lewelling Boulevard where drainage can be poor, we also check for moisture intrusion in crawlspace-mounted components.
Furnace Replacement
Full furnace replacement in San Lorenzo is often more complex than a standard swap because the original system was never designed for modern forced air. We replaced a failing floor furnace with a high-velocity small-duct system in a 1,200 sq ft Bohannon tract home on Via Alamitos. The original 1950s ductless layout forced us to route flex ducts through a cramped crawlspace, and we installed a Daikin heat pump to handle both heating and the new AC demand. That project typifies what San Lorenzo homeowners face: creative duct routing, mini-split adoption, or high-velocity small-duct solutions that fit where conventional trunk-and-branch runs won’t. We handle the county permit pull, the inspection scheduling, and the coordination with Alameda County — so you’re not left calling a county office yourself.
Furnace Tune-Up
A furnace tune-up in San Lorenzo costs $80–$200 and pays for itself in efficiency gains and failure prevention. For the original wall heaters and floor furnaces still operating in these 1945–1960 homes, annual service is critical. We clean burners, test gas pressure, inspect heat exchangers with cameras, and check limit switches that trip repeatedly when airflow is restricted by decades of dust or corroded venting. The Diablo winds that push temperatures into the high 90s each fall also drive first-time AC demand from homeowners who’ve never needed cooling — our tune-ups include heat pump readiness checks for those converting to year-round systems. Schedule before the October wind events hit.
Heat Exchanger Inspection & Replacement
Heat exchanger failure is the most serious issue we find in San Lorenzo’s aging furnace stock. Cracked exchangers leak carbon monoxide, and the salt-air corrosion endemic to Bay-adjacent communities accelerates metal fatigue. We use combustion analyzers and borescope cameras to inspect exchangers without full disassembly when possible. Replacement requires matching the new exchanger to your furnace model — we stock or can source Lennox, Goodman, and Rheem exchangers common in local retrofits. If the furnace is over 15 years old and the exchanger has failed, we’ll give you honest numbers on replacement versus repair so you can decide with real information.
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 Lorenzo
Your system, our specialty. We service nine major HVAC brands — Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard — and carry parts inventory for the brands most common in San Lorenzo retrofits. Goodman and Rheem furnaces appear frequently in post-war home conversions because of their compact footprints and flexible installation options. Lennox systems are popular in higher-end updates along the Washington Avenue corridor. We don’t tell you “we don’t work on that.” Factory training across all nine brands means faster diagnosis, fewer return trips, and repairs completed in a single visit when possible. Parts availability for San Lorenzo customers is same-day or next-day from our San Jose warehouse.
Common Heating & Furnace Problems We See in San Lorenzo Homes
- Corroded floor furnace heat exchangers. Original post-war floor furnaces in Bohannon tracts have endured 60–75 years of Bay air exposure. The salt-laden marine layer attacks steel heat exchangers from the outside while combustion byproducts corrode from within. Cracks develop slowly, then suddenly fail during the first cold snap. We test every original floor furnace for CO leakage during service calls.
- Condensation and mold in retrofit ductwork. Ductwork retrofits in slab-on-grade homes are prone to moisture problems when flex ducts run through damp crawlspaces without proper sealing. San Lorenzo’s marine layer keeps crawlspace humidity elevated year-round. We use insulated ducting and vapor-sealed connections to prevent the mold growth that triggers respiratory issues and system inefficiency.
- Gas valve and ignitor failures from Diablo wind overload. Late summer and fall heat events driven by Diablo winds push wall heaters and small furnaces beyond their design capacity. Undersized systems from the 1950s cycle excessively, burning out ignitors and warping gas valve diaphragms. We size replacement equipment to handle both normal heating loads and these extreme demand periods.
- Limit switch tripping from restricted airflow. Original floor furnaces rely on gravity airflow through floor grates. Decades of debris, pet hair, and corrosion reduce airflow enough to trip high-limit switches repeatedly. Homeowners reset the switch repeatedly until the safety fails entirely. Our tune-ups include grate cleaning, blower inspection, and airflow measurement to catch this before it becomes a no-heat call.
Pricing for Heating & Furnace in San Lorenzo, CA
| Service | Price Range in San Lorenzo |
|---|---|
| Furnace Repair | $150–$700 |
| Furnace Tune-Up | $80–$200 |
| Heat Exchanger Replacement | $800–$2,400 (includes diagnostic, part, labor) |
| Furnace Replacement (full system) | $3,500–$7,500 (varies by size, ductwork complexity, permit requirements) |
What moves you within these ranges? Accessibility is the big variable in San Lorenzo. A furnace in a spacious garage utility closet costs less to service than one buried in a cramped crawlspace under a slab-on-grade Bohannon home with 18 inches of clearance. Parts availability matters too — we stock common Goodman, Rheem, and Lennox components, but obsolete floor furnace parts may require creative sourcing or full system replacement. We give upfront pricing before any work begins, and estimates are always free. Call (844) 560-6978 to schedule yours.
We Also Serve Cities Near San Lorenzo
Our service radius extends throughout the East Bay flatlands. We regularly handle heating and furnace calls in Ashland, San Leandro, Cherryland, and Castro Valley — communities that share San Lorenzo’s marine-layer climate and much of the same post-war housing stock. The same county permitting expertise that benefits San Lorenzo homeowners applies throughout unincorporated Alameda County. If you’re unsure whether we cover your address, call (844) 560-6978 and we’ll confirm.
Serving San Lorenzo, CA — Our Local Coverage Area
We’re based in the San Lorenzo 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 Lorenzo
Yes. Because San Lorenzo is unincorporated Alameda County, all furnace replacements require a permit from the Alameda County Building Department, not a city office. We handle the entire permit application, fee payment, and inspection scheduling as part of our replacement service. Most San Lorenzo projects pass inspection on the first visit because we know exactly what Alameda County inspectors look for in retrofit installations. Call (844) 560-6978 and we’ll walk you through the timeline for your specific project.
Absolutely. Mini-split heat pumps are often the best solution for San Lorenzo’s original ductless homes because they eliminate the need for crawlspace duct routing entirely. We mount the outdoor unit on a concrete pad or wall bracket and run refrigerant lines through a small exterior penetration to wall-mounted indoor heads. The Daikin system we installed on Via Alamitos heats and cools a 1,200 sq ft home with three indoor zones — no ductwork required. For homes with shallow crawlspaces or slab foundations that make conventional ducts impractical, mini-splits are frequently the most cost-effective path to modern comfort. Call for a free assessment of your specific layout.
Restricted airflow is the cause in nearly every San Lorenzo floor furnace we service. Original gravity-flow systems depend on clear floor grates and unobstructed heat exchangers to move air. Decades of dust accumulation, corroded heat exchanger fins, and blocked return paths force the furnace to overheat. The limit switch trips as a safety shutdown. Repeated resetting damages the switch and risks exchanger failure. Our tune-up includes grate removal and cleaning, heat exchanger inspection, and airflow testing to identify the root cause. If the exchanger is cracked, we’ll show you camera footage and discuss replacement options. Schedule a diagnostic at (844) 560-6978.
A furnace tune-up in San Lorenzo runs $80–$200 depending on system type and accessibility. Standard forced-air furnaces in accessible locations fall at the lower end. Original floor furnaces requiring grate removal, crawlspace access, or combustion analysis for CO safety testing fall at the higher end. The service includes burner cleaning, gas pressure testing, heat exchanger inspection, safety control verification, and written documentation of findings. Annual tune-ups prevent the mid-winter emergency calls that cost significantly more in discomfort and repair bills. Call (844) 560-6978 to book — estimates are free if we find repair needs.
We service all nine major HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. In San Lorenzo’s retrofit market, we see Goodman and Rheem most frequently in affordable replacements, Lennox in mid-range updates, and Trane in higher-end installations. We don’t turn away customers because of brand. Our factory training and parts inventory cover the full range, so you’re never stuck finding a “specialist” for your specific equipment. If you’re unsure what brand you have, the nameplate is usually visible on the furnace cabinet — or just describe the unit when you call (844) 560-6978.
Ready to get your San Lorenzo home heating properly? Whether you’ve got a 1950s floor furnace that needs its annual safety check or you’re finally converting to central heat and AC, we’ll give you straight answers and upfront pricing. No dispatch center. No runaround. Just Marcus and our team, pulling the right permits and doing the job right. Call Crestview Heating & Air California at (844) 560-6978 for your free estimate today.
Written by Marcus Feldman, Owner at Crestview Heating & Air California, serving San Lorenzo and the East Bay since 2005.