Fast, Reliable Air Quality & Ventilation Across San Lorenzo
Air quality and ventilation work in San Lorenzo isn’t like working in newer East Bay cities. Most homes here are 1940s–1950s Bohannon tract houses built without central ductwork, and plenty of properties on the east side sit on acreage with detached workshops that need their own climate control. We make the drive to San Lorenzo from our San Jose base regularly, and we’re familiar with the tight crawlspaces, low-pitch roofs, and county permit process that define HVAC work in this unincorporated pocket of Alameda County. If you’re dealing with musty air in a workshop off Via Alamitos, struggling with dust during Diablo wind events, or trying to add ventilation to a home that originally heated with a floor furnace, call us at (844) 560-6978. We’ll look at your setup and give you a free, upfront estimate.
Why Crestview Heating & Air California Is San Lorenzo’s Preferred Air Quality & Ventilation Company
We’ve spent nearly two decades solving HVAC problems in the East Bay flatlands, and San Lorenzo’s unique housing stock has taught us plenty. Owner Marcus Feldman still manages every job as Service Manager, so the person quoting your ventilation retrofit is the same person making sure it’s done to spec. That matters in San Lorenzo, where nearly every air quality installation involves creative problem-solving in attics with 18-inch clearances and crawlspaces that weren’t designed for modern ductwork.
Our 4.8-star average across 250+ customer reviews reflects real jobs in real homes, not cherry-picked testimonials. San Lorenzo customers specifically mention our ability to navigate the Alameda County permit process without delays, and our willingness to explain why a mini-split or high-velocity system makes more sense than forcing conventional ductwork into a 1952 slab-on-grade Bohannon home.
We don’t outsource to subcontractors. Marcus oversees each installation personally, and our factory training across nine major brands means we won’t tell you “we don’t service that” when you have a Rheem air handler or a Lennox ERV unit. From emergency calls to commercial buildouts, your system is our specialty.
Our Air Quality & Ventilation Services in San Lorenzo
ERV & HRV System Installation
Energy Recovery Ventilators and Heat Recovery Ventilators are essential in San Lorenzo’s older homes, where original construction prioritized neither airtightness nor mechanical ventilation. But ERV/HRV systems here face a specific challenge: the combination of marine-layer moisture and sudden Diablo wind-driven heat creates pressure imbalances that cause poorly commissioned units to short-cycle or freeze up. We size and balance every ERV/HRV installation for San Lorenzo’s actual conditions, not textbook assumptions. Because San Lorenzo is unincorporated Alameda County, we pull permits through the county Building Department, a workflow we’ve refined over years that keeps inspection scheduling on track. A typical ERV or HRV installation in San Lorenzo runs $2,800–$5,400 depending on home size and duct routing complexity.
Whole-House Dehumidifier Installation
San Lorenzo’s proximity to the Bay means persistent moisture, especially in fall when marine layers sit heavy on the flatlands. For homeowners with detached workshops or converted garages, that moisture turns into musty odors, rust on stored equipment, and mold-friendly conditions. On a 1.5-acre property on Via Alamitos, we installed a whole-house dehumidifier paired with a Carrier high-velocity system in a 1950s Bohannon home with a low-pitch roof. The owner’s detached workshop had chronic moisture issues from stored equipment, so we added an Aprilaire 1850 bypass humidifier to maintain stable humidity. We navigated a tight crawlspace to route ductwork without compromising the slab foundation. Most whole-house dehumidifier installations in San Lorenzo range from $1,800–$3,600.
Ventilation Installation for Retrofit Homes
Nearly every central ventilation installation in San Lorenzo is a retrofit. The Bohannon homes were built with floor furnaces or wall heaters, not forced-air systems. Adding ventilation means either creative duct routing through attics with minimal clearance, or abandoning ductwork entirely for ductless mini-split solutions with dedicated fresh-air modules. We’ve done both hundreds of times. Our Air Quality & Ventilation team knows when to recommend high-velocity small-duct systems that can snake through existing walls, and when a mini-split with a ventilation kit is the smarter play. Ventilation retrofits in San Lorenzo typically cost $3,200–$7,500 depending on approach and home size.
UV Air Purifier Installation
UV-C air purifiers mount inside your existing ductwork or air handler to neutralize mold spores, bacteria, and viruses. In San Lorenzo, they’re particularly valuable in homes where retrofit ductwork runs through damp crawlspaces, creating conditions where microbial growth can colonize the system itself. We install UV purifiers from Lennox, Goodman, and other major brands, always matching the unit to your specific system airflow. Most UV air purifier installations run $650–$1,400 in San Lorenzo.
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 maintain factory-trained compatibility across nine major HVAC brands, and we stock common parts for Trane, Lennox, Goodman, and Rheem systems specifically. That means San Lorenzo customers aren’t waiting days for a specialty filter, ERV core, or dehumidifier pad to ship from a warehouse. For a community where many systems are custom retrofits, fast parts availability keeps projects moving. Your system, our specialty — whether it’s a standard Rheem air handler or a high-velocity Unico system we installed in a Bohannon cottage off Grant Avenue.
Common Air Quality & Ventilation Problems We See in San Lorenzo Homes
- Oversized workshop doors let in overwhelming debris. Detached workshops on San Lorenzo’s acreage properties often have oversized roll-up or barn-style doors that standard residential filtration can’t handle. Dust and pollen pour in during Diablo wind events, clogging filters in days and overloading ventilation systems designed for tighter building envelopes.
- Marine-layer moisture meets sudden heat, stressing ERV/HRV systems. San Lorenzo’s climate creates rapid humidity swings that poorly commissioned energy recovery systems can’t track. We see short-cycling and freeze-ups in units installed by out-of-area contractors who didn’t account for local pressure differentials.
- Self-installed filters choke retrofitted systems. San Lorenzo homeowners are hands-on, but filter selection in retrofitted high-velocity or mini-split systems requires precision. Too dense a filter restricts airflow, causing compressor strain during August heat waves when the system is already working hardest.
- Original floor furnace rooms need fresh air without destroying character. Converting a floor-furnace closet into a conditioned space or adding ventilation to a room that never had ductwork takes planning. We’ve routed flexible duct through closets, soffits, and even exterior chases to preserve original floor plans in Bohannon homes.
Pricing for Air Quality & Ventilation in San Lorenzo, CA
We believe in upfront numbers, not vague “call for pricing” dodges. Here’s what air quality and ventilation work actually costs in San Lorenzo’s market:
| Service | Typical Range in San Lorenzo |
|---|---|
| UV Air Purifier Installation | $650 – $1,400 |
| Whole-House Dehumidifier Install | $1,800 – $3,600 |
| ERV/HRV System Installation | $2,800 – $5,400 |
| Ventilation Retrofit (full system) | $3,200 – $7,500 |
| Air Filtration Upgrade (media cabinet) | $450 – $950 |
Final cost depends on your home’s existing infrastructure, access conditions, and whether we’re integrating with a system we installed or troubleshooting someone else’s retrofit. Because San Lorenzo permits route through Alameda County rather than a city office, we handle that paperwork as part of our standard process — no surprise fees, no delays from contractors who don’t know the county workflow. Call (844) 560-6978 for a free, exact quote.
We Also Serve Cities Near San Lorenzo
Our service radius covers the full East Bay flatlands corridor. We regularly handle air quality and ventilation work in Ashland and Cherryland (similar unincorporated Alameda County communities with comparable housing stock), San Leandro to the north, and Castro Valley in the hills to the east. Each community has its own permit pathways and typical building conditions, and we adjust our approach accordingly.
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 — Air Quality & Ventilation in San Lorenzo
Yes, all HVAC permits in San Lorenzo go through the Alameda County Building Department because the community is unincorporated, not a city. We handle this paperwork routinely, and our familiarity with county inspectors typically means faster turnaround than contractors who are used to city permit offices. Call (844) 560-6978 and we’ll walk you through what’s needed for your specific project.
Yes, though low-pitch and flat roofs in San Lorenzo’s Bohannon tracts limit attic space for conventional ductwork. We often use high-velocity small-duct systems or wall-mounted ERV units with dedicated intake/exhaust runs that don’t require attic clearance. Marcus Feldman has personally designed dozens of these retrofits in 94580 zip code homes. Most flat-roof ERV installations in San Lorenzo run $3,200–$5,800 — call for a free assessment of your specific roof structure.
Yes, if the workshop is connected to your home’s HVAC system or if we install a dedicated dehumidification unit. For standalone workshops, we may recommend a separate commercial-grade dehumidifier with dedicated drainage rather than tying into residential ductwork that wasn’t sized for the additional load. We’ve solved this exact problem on Via Alamitos and similar San Lorenzo properties. Whole-house dehumidifiers start around $1,800 installed; standalone workshop units vary by capacity.
Diablo winds carry fine dust and pollen from inland valleys directly across San Lorenzo’s flatlands, and older homes with original windows, garage doors, or workshop openings have more infiltration paths than newer construction. Upgrading to a 4-inch or 5-inch media filter (instead of a standard 1-inch) extends change intervals, and sealing obvious leakage points helps. If you have a workshop with oversized doors, we may recommend a separate air cleaner for that space. Call (844) 560-6978 and we’ll check your current filter sizing and home envelope.
Yes, this is one of our most common requests in San Lorenzo. We typically remove the floor furnace, seal the opening, and route new supply and return air through adjacent walls, closets, or a small soffit. In homes with slab foundations and no crawlspace access, we may use high-velocity ductwork or a ductless mini-split with a fresh-air ventilation module. Every Bohannon home is slightly different, so we always inspect before quoting. Most floor-furnace-to-forced-air conversions in San Lorenzo run $3,500–$7,200 depending on approach.
Ready to fix the air quality in your San Lorenzo home or workshop? Call (844) 560-6978 for a free estimate. We’ll look at your existing system, explain your options in plain language, and give you an exact price before any work begins. Owner-managed, not outsourced — that’s how we’ve earned our 4.8-star rating across 250+ reviews, and it’s how we’ll handle your job too.
Written by Marcus Feldman, Owner at Crestview Heating & Air California, serving San Lorenzo and the East Bay since 2005.