Fast, Reliable HVAC Cleaning Across San Lorenzo
We’re Bellows Air Duct & Vent Co., and we’ve been driving out to San Lorenzo since 1984. If you live in the 94580 ZIP, chances are your home was built by David Bohannon’s crew sometime between 1944 and 1955, and your forced-air system has been running through that same raised-foundation crawl space for seventy-plus years. That matters. San Lorenzo isn’t like Hayward or Castro Valley, where housing eras are mixed and problems are scattered. Here, the whole town ages together, and we’ve learned what that means for your ducts, your coils, and the air your family breathes. Call us at (844) 685-6342. Most jobs are done in a single visit, and we’ll show you exactly what we find before we lift a single tool.
Why Bellows Air Duct & Vent Co. Is San Lorenzo’s Preferred HVAC Cleaning Company
We’ve built our reputation in the East Bay on showing up when we say and standing behind the work. Our HVAC Cleaning team knows the Bohannon tracts block by block, from the ranch homes near San Lorenzo Creek up to the minimal traditional styles closer to Hesperian Boulevard. We’ve cleaned, repaired, and replaced ductwork in enough of these homes to recognize the patterns before we even crawl underneath.
Our customers in San Lorenzo call us back because we answer the phone 24 hours a day with a live person, not an app or a voicemail tree. Our technicians are background-checked, uniformed, and equipped with camera inspection gear so you see what we see. That matters when you’re deciding whether a 1950s duct run can be cleaned or needs to be cut out and replaced. Our 90-Day Done Right Promise is stamped on every job: if it’s not right, we make it right, no paperwork, no arguing.
Our HVAC Cleaning Services in San Lorenzo
Evaporator Coil Cleaning
The evaporator coil in your air handler sits in that same damp crawl-space environment, and in San Lorenzo, it pays the price. Marine-layer humidity from the bay seeps through foundation vents year-round, and when that moisture meets a coil coated with dust and organic debris, you get a film of mold that no filter will stop. We remove the coil assembly, clean it with professional-grade foaming agents from Nikro, and inspect the drain pan for cracks or standing water. A clean coil moves more air, pulls less electricity, and doesn’t blow spores into your living room.
Coil Treatment
Cleaning alone isn’t always enough in this zip code. After we clean your evaporator coil, we apply a coil treatment that inhibits mold regrowth for the coming season. San Lorenzo’s persistent crawl-space moisture means coils here recontaminate faster than in drier inland cities like Livermore or Dublin. The treatment buys you time. It’s not a miracle cure, but it’s a real step that matches the real conditions under your floor. We include this in our full-system cleans and offer it as a standalone service for homeowners who’ve noticed that musty smell returning within months of a standard cleaning.
Air Handler Cleaning
Your air handler is the heart of the system, and in Bohannon-built homes, it’s often the original cabinet or a replacement that was shoehorned into the same tight crawl-space footprint. We clean the blower wheel, motor housing, heat exchanger surfaces, and the cabinet interior, removing the accumulated grime that restricts airflow and strains components. Because San Lorenzo’s duct systems are so uniformly old, the air handler often works harder than it should, pulling against collapsed or leaking runs. A clean handler paired with sealed ducts runs quieter, lasts longer, and doesn’t wake you up at 2 a.m. with a grinding blower wheel.
Blower Cleaning
The blower wheel itself deserves its own attention. Over years of operation, it collects a mat of dust, hair, and in San Lorenzo crawl spaces, sometimes rodent nesting material that gets drawn upstream. An unbalanced blower wheel vibrates, wears out bearings, and moves significantly less air. We remove the wheel, clean each vane, balance it, and reinstall it with fresh seals. Most San Lorenzo homeowners notice the difference immediately, especially in two-story homes where the upstairs never seemed to get enough airflow.
Condenser Cleaning
Your outdoor condenser coil takes a beating from the East Bay’s mix of bay moisture, pollen, and the fine dust that blows off the Diablo Range in late summer. We wash the fins, straighten damage from lawn equipment or dogs, and check refrigerant levels while we’re on site. A clean condenser runs cooler and doesn’t short-cycle on the hottest September afternoons when San Lorenzo’s inland heat finally pushes through the marine layer.
Heat Exchanger Cleaning
In older furnaces still common in San Lorenzo’s original tracts, the heat exchanger needs visual inspection and cleaning to rule out cracks or corrosion that could leak combustion gases into your air stream. We camera-inspect before and after, document the condition, and if we find failure, we tell you straight so you can make an informed decision about repair versus replacement. No scare tactics. Just the picture and our recommendation.
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
We carry professional-grade equipment and parts from Honeywell, Aprilaire, and Abatement Technologies, the same brands serious HVAC contractors specify for their own installs. For San Lorenzo homeowners with aging systems, this means we can often source replacement components for older air handlers and condensers without the long wait times that send other companies back to the warehouse twice. Our trucks are stocked for single-visit completion because we know you’d rather not take a second day off work.
Common HVAC Cleaning Problems We See in San Lorenzo Homes
- Rusted-through sheet metal at duct joints. The original Bohannon ductwork was galvanized steel, and seventy years of crawl-space humidity has eaten through the joints. We find pinholes and gaping rust holes that leak conditioned air into the dirt and pull musty crawl-space air back into your supply. Cleaning alone won’t seal them; we show you the camera footage and discuss repair options with real numbers.
- Rodent harborage in flex-duct connections. The original tract construction left gaps at flex-duct takeoffs that rats and mice have exploited for generations. We pull out shredded insulation, droppings, and sometimes entire nests. San Lorenzo’s uniform housing stock means this pattern repeats block after block in a way we simply don’t see concentrated in neighboring cities with more varied construction eras.
- Condensation-driven mold on duct surfaces. When crawl-space insulation breaks down or gets torn by pests, the duct metal runs cold and sweats in the humid air. That moisture feeds mold growth that recurs after every standard cleaning unless the insulation and moisture source are addressed. We flag this when we see it.
- Collapsed or disconnected flex-duct runs. Original flex-duct from the 1970s and 1980s retrofits has gone brittle and collapsed in sections, or pulled completely free of the main trunk. Homeowners wonder why one room never heats or cools; we crawl back with the camera and show them the disconnected hose lying in the dirt.
Pricing for HVAC Cleaning in San Lorenzo, CA
We don’t do bait coupons or price changes at the door. Here’s what HVAC cleaning costs in San Lorenzo’s market:
| Service | Typical Range in San Lorenzo |
|---|---|
| Full-system HVAC cleaning (ducts, coils, blower, air handler) | $450 - $850 |
| Evaporator coil cleaning only | $280 - $420 |
| Coil treatment (applied after cleaning) | $120 - $180 |
| Air handler and blower cleaning | $320 - $480 |
| Condenser cleaning | $180 - $280 |
| Heat exchanger inspection and cleaning | $220 - $340 |
| Duct section replacement (per damaged run) | $200 - $450 |
What moves you within these ranges: the number of supply and return vents, accessibility of your crawl space, whether we find damage requiring repair before cleaning is worthwhile, and whether you bundle services. We inspect with the camera first, quote upfront, and the number on the phone is the number on the invoice. Estimates are free. Call (844) 685-6342.
Standing offers: $50 off any repair over $250, free second opinion on any written estimate, $89 seasonal tune-up, and a permanent 5% senior and veteran discount.
We Also Serve Cities Near San Lorenzo
Our crews run regular routes through San Leandro, Castro Valley, Hayward, and Union City. Each city has its own housing patterns and duct configurations, and we’ve learned them over four decades. But San Lorenzo’s concentrated postwar tract stock remains unique in the East Bay for the uniformity of its aging systems.
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 - HVAC Cleaning in San Lorenzo
San Lorenzo’s position adjacent to the bay and San Lorenzo Creek keeps crawl spaces persistently damp from marine-layer humidity year-round, unlike drier inland East Bay cities such as Livermore or Dublin. This sustained moisture environment means duct contamination in these homes skews heavily toward mold and mildew growth rather than just dust accumulation. The original Bohannon construction also routed all ductwork through these unconditioned crawl spaces rather than attics, exposing every home in the 94580 ZIP to the same wet environment. Call (844) 685-6342 for a free inspection and camera review of your system’s condition.
It depends on what the camera shows, but in San Lorenzo we find that original sheet metal ducts from the Bohannon era often need section replacement rather than simple cleaning after seventy-plus years. If the metal is intact with only surface rust and the joints are sealed, cleaning and sealing may extend service life. If we find rust-through, disconnected flex-duct takeoffs, or rodent damage that has compromised multiple sections, replacement of the damaged runs is the honest recommendation. We’ll show you both options with exact pricing before any work begins.
The signs are usually unmistakable once you know to look: musty or urine-like odors that intensify when the system runs, scattered debris or droppings at floor vents, or sudden unexplained allergy symptoms in family members. In San Lorenzo’s Bohannon tracts, the original construction left flex-duct connection gaps that generations of rats and mice have exploited, so the problem is far more common here than in cities with tighter, newer duct systems. Our camera inspection finds the nests and damage; call (844) 685-6342 to schedule one.
We strongly recommend it. San Lorenzo’s marine-layer humidity means evaporator coils here redevelop mold film faster than in drier climates. Cleaning removes the existing contamination; coil treatment slows regrowth through the coming season. It’s not required, but it’s the right tool for the actual conditions under your floor. We include it in our full-system package and offer it standalone for homeowners who’ve had standard cleanings elsewhere and watched the musty smell return within months.
Because the air handler is where your air is actually moved, heated, and cooled. A dirty blower wheel, clogged drain pan, or moldy coil surface recontaminates clean ducts within days. In San Lorenzo’s older homes, the air handler has often been pulling against damaged, leaking ductwork for years, working harder and accumulating more debris than a properly sealed system. Cleaning the handler completes the job and protects your investment in clean ducts. We won’t sell you half a solution.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving San Lorenzo since 1984.