Fast, Reliable Emergency & Commercial HVAC Across San Lorenzo
When your HVAC system fails at a commercial property on Hesperian Boulevard or your home’s aging furnace quits during a Diablo wind heat spike, you need a crew that knows San Lorenzo’s specific building stock and permitting quirks. We’re Crestview Heating & Air California, and our Emergency & Commercial HVAC team responds to calls throughout the 94580 ZIP code, from the original Bohannon tract homes near Lewelling Boulevard to the commercial strips along East 14th Street. Call us at (844) 560-6978 for emergency service or a free estimate.
Why Crestview Heating & Air California Is San Lorenzo’s Preferred Emergency & Commercial HVAC Company
We’ve been working in San Lorenzo long enough to know that an out-of-area contractor will struggle here. The permitting alone trips them up.
San Lorenzo is unincorporated Alameda County. That means every HVAC permit runs through the Alameda County Building Department in Hayward, not a city office with familiar staff. Our crew knows the county’s inspection schedules, their specific code amendments for coastal corrosion zones, and which inspectors cover San Lorenzo’s commercial corridors. We’ve watched contractors from inland cities lose a full week because they filed paperwork at the wrong desk.
Our reputation here is built on showing up prepared. Marcus Feldman, our owner and active Service Manager, still manages jobs in the field — not from an office across the Bay. That ownership-level accountability shows in our 4.8-star average across 250+ customer reviews. When a San Lorenzo property manager calls us for emergency commercial HVAC, they’re talking to someone who can make decisions and dispatch immediately, not a call center reading a script.
We also understand the physical territory. San Lorenzo’s flatland geography, shallow crawlspaces, and exposure to marine-layer moisture create failure patterns that look different from San Jose or Fremont. We don’t diagnose your system from a generic checklist. We diagnose it from 19 years of hands-on experience in East Bay conditions.
Our Emergency & Commercial HVAC Services in San Lorenzo
24/7 Emergency HVAC
Diablo wind events don’t follow business hours. When temperatures spike into the high 90s in late September and your compressor seizes or your breaker trips, we answer emergency calls throughout San Lorenzo. Our emergency service covers both residential and commercial systems — failed rooftop units at strip malls, dead furnaces in Bohannon-era homes near Washington Avenue, capacitor blowouts during heat spikes. We stock common parts for the nine major brands we service, so we’re not ordering overnight while your building bakes.
Commercial HVAC
San Lorenzo’s commercial corridors along Hesperian Boulevard and East 14th Street rely on rooftop units and split systems that take a beating from salt-laden coastal fog. We service and replace commercial equipment for retail spaces, office buildings, restaurants, and light industrial properties. Because San Lorenzo is unincorporated, commercial HVAC replacements require Alameda County permits with specific seismic and corrosion-resistance requirements. We’ve navigated this process dozens of times. Out-of-area contractors often miss the county’s commercial energy compliance forms, causing inspection failures and reopening fees.
Rooftop Unit Service and Replacement
Coastal salt air is the silent killer of rooftop HVAC in San Lorenzo. Condenser coils pit within five years. Fan blades corrode at the hub. Mounting brackets rust through. We inspect, repair, and replace rooftop units with corrosion-resistant hardware — galvanized brackets, stainless steel fasteners, coated coils — because standard installations here fail prematurely. During a September 2022 Diablo wind heat wave, we replaced a failed rooftop unit at a commercial strip mall on Hesperian Boulevard. The coastal salt air had corroded the condenser coils and seized the compressor on a 10-year-old Lennox unit. We swapped it with a Daikin R-32 system, installing galvanized mounting brackets and stainless steel fasteners to resist future corrosion.
Chiller Service
For larger commercial properties in San Lorenzo with chilled-water systems, we provide diagnostics, refrigerant management, compressor repair, and controls troubleshooting. Chillers in this coastal environment face the same salt-air corrosion as rooftop units, plus the added complexity of water treatment and tower maintenance. We service both air-cooled and water-cooled chiller systems.
Annual Maintenance and HVAC Inspection
Annual maintenance isn’t optional in San Lorenzo — it’s survival planning. Our maintenance program includes corrosion inspection of coastal-exposed components, refrigerant level checks before Diablo wind season, electrical connection tightening (heat expansion loosens terminals), and crawlspace ductwork assessment for moisture damage. Commercial clients on annual contracts get priority scheduling for emergency calls and documented inspection records for Alameda County compliance.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Lorenzo
Your system, our specialty. We factory-train on nine major HVAC brands, and we regularly stock parts for Trane, Lennox, Goodman, and Rheem units commonly found in San Lorenzo’s commercial and residential properties. Many of the original Bohannon homes were later retrofitted with Goodman or Rheem systems during the 1980s and 90s upgrade waves, so we keep capacitors, contactors, and blower motors on hand. For newer commercial installations, we carry Trane and Lennox rooftop unit components. This local parts inventory means faster repairs and less downtime for your business or home.
Common Emergency & Commercial HVAC Problems We See in San Lorenzo Homes
- Electrical failures during Diablo wind-driven heat events: Sudden 90°F+ spikes overload undersized systems in original Bohannon homes, tripping breakers or blowing capacitors. Many of these homes still run on 100-amp electrical panels that weren’t designed for central AC load.
- Corrosion of commercial rooftop condensers from salt-laden coastal fog: Coils and fan blades pit within 5 years, reducing efficiency and causing refrigerant leaks. We see this constantly on units mounted within a mile of the Bay.
- Ductwork collapse in tight crawlspaces of 1940s-50s slab homes: Original galvanized ducts corrode from marine moisture, causing airflow blockages that trigger emergency service calls. The shallow crawlspaces — sometimes 18 inches or less — make replacement work technically demanding.
- Compressor seizure in rooftop units after neglected maintenance: Salt corrosion on electrical terminals and refrigerant leaks from pitted coils combine to overload compressors. Annual inspection catches this before failure.
Pricing for Emergency & Commercial HVAC in San Lorenzo, CA
We believe in upfront pricing. Here’s what typical Emergency & Commercial HVAC work runs in the San Lorenzo market:
| Service | Price Range in San Lorenzo |
|---|---|
| AC Repair | $150–$650 |
| Furnace Repair | $150–$700 |
| AC Installation | $3,500–$7,500 |
| Tune-Up / Annual Maintenance | $80–$200 |
Commercial rooftop unit replacement and chiller work are quoted individually based on tonnage, access difficulty, and Alameda County permit requirements. Emergency service calls carry a diagnostic fee that is applied toward repair if you proceed. Every estimate is free — call (844) 560-6978 to schedule.
What drives cost variation in San Lorenzo specifically? The Bohannon-era housing stock often requires creative duct routing or mini-split solutions that add labor. Coastal corrosion damage may necessitate replacement of multiple components rather than single-part repair. And Alameda County’s commercial permitting fees are separate from our labor and materials. We explain all of this before work begins.
We Also Serve Cities Near San Lorenzo
Our Emergency & Commercial HVAC coverage extends throughout the East Bay flatlands. We regularly service commercial properties and homes in Ashland, San Leandro, Cherryland, and Castro Valley — all sharing similar coastal corrosion challenges and Alameda County permitting requirements. If you’re a property manager with multiple locations across these cities, we can coordinate maintenance schedules and inspection documentation under a single account.
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 commercial HVAC replacements require permits through the Alameda County Building Department, not a city office. Our crew files these permits regularly and knows the county’s specific commercial energy compliance forms, seismic requirements, and inspection scheduling. Call (844) 560-6978 and we’ll handle the permitting as part of your project.
Coastal salt fog accelerates corrosion of condenser coils, fan blades, electrical terminals, and mounting hardware by 3–5 years compared to inland locations. We combat this with galvanized mounting brackets, stainless steel fasteners, and coated coils on replacements, plus annual corrosion inspections for existing equipment. Without this targeted protection, rooftop units near Hesperian Boulevard and East 14th Street commercial corridors fail prematurely.
San Lorenzo’s Bohannon tract homes were built in the late 1940s–50s with floor furnaces or wall heaters, not central forced air. These 1,100–1,400 sq ft homes on slab or shallow crawlspace foundations have low-pitch roofs with tight attic clearances that make conventional trunk-and-branch duct runs difficult or impossible. We specialize in ductless mini-split systems and high-velocity small-duct solutions that retrofit these homes without major structural modification.
We service all nine major brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For commercial emergency calls in San Lorenzo, we most commonly encounter Trane and Lennox rooftop units, Goodman split systems in smaller retail spaces, and Rheem equipment in properties upgraded during the 1990s. Our parts inventory covers the most common failure components for these brands.
Commercial HVAC systems in San Lorenzo’s coastal corrosion zone should be inspected twice yearly — before cooling season (April–May) and before heating season (September–October). Salt-air exposure warrants quarterly coil cleaning for rooftop units, and annual electrical connection torque verification. Properties within a half-mile of the Bay may need monthly visual checks during fog season. Call (844) 560-6978 to set up a maintenance schedule tailored to your location.
Written by Marcus Feldman, Owner at Crestview Heating & Air California, serving San Lorenzo and the East Bay since 2005.