Fast, Reliable Emergency & Commercial HVAC Across San Lorenzo
When your HVAC fails in San Lorenzo, you need a crew that knows the difference between a modern system and a 1950s Bohannon tract home with original floor furnaces and zero ductwork. We answer emergency calls throughout the 94580 ZIP, including the neighborhoods along Via Corona, Hesperian Boulevard, and the interior blocks where mid-century slab homes still heat through in-floor gas units. Most San Lorenzo calls get same-day response, and our Emergency & Commercial HVAC team carries parts for Carrier, Bryant, and American Standard systems on every truck. Call (844) 875-9451 now if you’re facing a heating emergency or a commercial breakdown.
Why Redwood Heating & Air San Diego Is San Lorenzo’s Preferred Emergency & Commercial HVAC Company
Gregory Hahn founded this company and still leads every technical decision. That matters in San Lorenzo, where the housing stock is unlike anywhere else in the East Bay. We’ve spent 13 years diagnosing systems in Bohannon tract homes, and our 428 verified reviews averaging 4.6 stars include plenty from San Lorenzo property owners who got tired of contractors suggesting solutions designed for newer construction.
Our response time to San Lorenzo typically runs under two hours for emergency calls placed before 6 PM. We know the area. We know the permits go through Alameda County, not a city office. And we know that a “simple” furnace replacement on a slab home near Hesperian Boulevard often means engineering a full duct system from scratch.
That local fluency saves time and money. A contractor who shows up expecting a standard attic duct run will quote you wrong, order wrong, and probably walk off the job.
Our Emergency & Commercial HVAC Services in San Lorenzo
24/7 Emergency HVAC
San Lorenzo’s original in-floor furnaces don’t fail on a schedule. We’ve responded at 11 PM to cracked heat exchangers leaking carbon monoxide into homes on Via Corona. We’ve handled compressor seizures during October Diablo wind events when temperatures spike 30 degrees in hours and undersized AC units collapse under the load. Our emergency line, (844) 875-9451, routes directly to Gregory Hahn’s dispatch. We carry combustion analyzers, refrigerant recovery equipment, and temporary heating units on every emergency truck.
Commercial HVAC
The commercial strip along Hesperian Boulevard and the smaller retail plazas near Ashland rely on rooftop units and split systems that can’t afford downtime. We service commercial HVAC for restaurants, medical offices, and light industrial tenants throughout unincorporated San Lorenzo. Because we’re certified on nine major brands, we don’t need to special-order proprietary parts or subcontract to a “factory authorized” dealer who takes three days to show up.
Rooftop Unit Service & Replacement
San Lorenzo’s flat-roof commercial buildings, particularly the older retail centers near the San Leandro border, often run aging rooftop package units. Replacement requires crane coordination and, critically, Alameda County permits that differ from incorporated-city procedures. We’ve managed emergency RTU swaps in San Lorenzo where the previous contractor stalled for two weeks waiting on permit clarification. We know the county building department’s requirements and submit complete packages the first time.
Chiller Service
While chillers are less common in San Lorenzo’s smaller commercial base, the medical and light industrial facilities near Castro Valley and Cherryland that fall within our service radius depend on them for process cooling. Our Master Technician-level diagnosis applies to chiller refrigerant circuits, compressor staging, and controls integration. We don’t guess at chiller problems. We measure, isolate, and fix.
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
We stock common parts for Carrier, Bryant, and American Standard systems on our San Lorenzo trucks, with Daikin mini-split components available for the ductless retrofits that make sense in many Bohannon homes. Our nine-brand certification means we don’t steer you toward the equipment we know at the expense of what’s actually right for your building. If you’ve got a 20-year-old Rheem still limping along on Hesperian Boulevard, we’ll fix it if it’s fixable. If you’re converting a floor-furnace slab home to central AC, we’ll spec the Bryant or American Standard system that fits the load calculation, not the one that pads our margin.
Common Emergency & Commercial HVAC Problems We See in San Lorenzo Homes
- Cracked heat exchangers in original in-floor furnaces. These mid-century units, still operational in surprising numbers across the 94580 ZIP, develop cracks that spill carbon monoxide into living spaces with no ductwork to dilute it. We test with combustion analyzers and shut down unsafe units on the spot.
- Compressor failures on undersized AC retrofits. San Lorenzo’s Diablo wind events push 95–100°F, and units sized for mild East Bay summers can’t keep up. The thermal swing from 100°F afternoon to 62°F marine-layer night also stresses single-stage compressors cycling hard.
- Permit delays on commercial emergency replacements. Contractors accustomed to Hayward or San Leandro city permits get stuck navigating Alameda County’s unincorporated process, turning a same-day emergency into a week-long ordeal for businesses on Hesperian Boulevard.
- Ductless mini-split condensate backups in humid marine-layer mornings. The overnight moisture that rolls into San Lorenzo from the Bay can overwhelm poorly sloped drain lines on high-wall units, causing emergency water-damage calls.
Pricing for Emergency & Commercial HVAC in San Lorenzo, CA
We don’t quote blind. Every San Lorenzo job gets a free, on-site estimate with itemized pricing before we start work. Here are the ranges we see most often for residential calls in the 94580 area:
| Service | Typical Range in San Lorenzo |
|---|---|
| AC Repair | $150–$650 |
| Furnace Repair | $150–$700 |
| AC Installation | $3,500–$7,500 |
| Tune-Up | $80–$200 |
Commercial rooftop and chiller work runs project-specific, but our estimates are always free. Emergency after-hours rates apply for calls between 8 PM and 7 AM. The biggest cost variable in San Lorenzo isn’t the equipment, it’s the labor to engineer ductwork into homes that were never designed for it. A slab home on Via Corona with no attic and no crawl space requires creative routing through closets, soffits, or a ductless solution entirely. We’ll walk you through every option and what each costs.
Call (844) 875-9451 for your free estimate.
We Also Serve Cities Near San Lorenzo
Our service radius covers the unincorporated and incorporated communities surrounding San Lorenzo, including Ashland, San Leandro, Cherryland, and Castro Valley. Each has its own permit quirks and housing stock, and we adjust our approach accordingly. The same Alameda County permit process that governs San Lorenzo also applies to Ashland and Cherryland, while San Leandro and Castro Valley run through city building departments.
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 — Emergency & Commercial HVAC in San Lorenzo
Yes. Because San Lorenzo is unincorporated Alameda County, all HVAC permits and inspections route through the county building department, not a city office. This surprises contractors who primarily work in incorporated cities like Hayward or San Leandro, and it’s a common source of project delays. We submit complete county permit packages with every San Lorenzo replacement to avoid that trap. Call (844) 875-9451 and we’ll confirm exactly what your job requires.
Any in-floor furnace manufactured before 1990 should be inspected annually for cracked heat exchangers, which can leak carbon monoxide directly into living spaces. We use combustion analyzers to measure CO levels in the burner chamber and ambient air; elevated readings mean immediate shutdown and replacement. We got a late-night call from a home on Via Corona, a classic Bohannon tract, where the original in-floor gas furnace — still operational since the 1950s — started spewing soot into the living room. Our tech capped the gas, tested for carbon monoxide (elevated), and recommended a full retrofit to a ducted split system, given the cracked heat exchanger and zero ductwork. If you smell gas, see soot, or your CO detector alarms, evacuate and call us immediately.
Yes, but central ducted AC typically requires building duct chases, which is invasive and expensive in slab homes with minimal attic clearance. Most San Lorenzo Bohannon tracts are better candidates for ductless mini-split systems, which need only a 3-inch refrigerant line run through exterior walls. We install both and will quote each approach honestly. A ductless system for a 1,000-square-foot San Lorenzo home typically runs toward the lower end of our AC installation range. Call (844) 875-9451 for a free assessment of your specific layout.
We install and service Carrier and Bryant rooftop units most frequently for San Lorenzo commercial clients, with American Standard as a strong alternative for high-efficiency requirements. The right brand depends on your existing controls, electrical service, and whether you’re matching to a multi-unit system. We’re brand-agnostic in our diagnosis and won’t push a proprietary solution that complicates your maintenance. For a specific recommendation on your Hesperian Boulevard property, we’ll need to survey the site.
Diablo winds push San Lorenzo temperatures 20–30 degrees above normal September–October conditions, and many AC units in original floor-heat-only homes were retrofitted with undersized condensers that can’t handle the load. Compressors running at maximum capacity for extended periods overheat and fail, particularly on older systems with degraded capacitors or dirty condensers. The fix isn’t just a new compressor; it’s a proper load calculation that accounts for those 100°F spikes. We size for reality, not average weather.
Ready to get your San Lorenzo home or business back to comfortable? Call Redwood Heating & Air San Diego at (844) 875-9451 for a free estimate. Gregory Hahn answers the technical questions personally, and our crew knows the Bohannon tracts, the county permit process, and the brands you own.
Written by Gregory Hahn, Owner at Redwood Heating & Air, serving San Lorenzo since 2012.