HVAC Cleaning in San Anselmo - Same-Day Service, Done Right the First Time

Fast, Reliable HVAC Cleaning Across San Anselmo

Professional HVAC cleaning in San Anselmo typically runs $280-$580 for a complete system service, and most jobs are finished in a single visit. Our HVAC Cleaning team has been driving to San Anselmo since 1984, and we know the difference between a hillside home off Sir Francis Drake Boulevard and a valley-floor house near San Anselmo Creek where the ductwork lives in a different world. Call (855) 401-6006 for a free estimate. We’ll show up when we say, show you the price before we start, and leave you with a camera record of what came out of your system.

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Why Bellows Air Duct & Vent Co. of California Is San Anselmo’s Preferred HVAC Cleaning Company

We’ve built our reputation in Marin County on one principle: the job is done right, or we make it right. No paperwork, no arguing. Our 90-Day Done Right Promise is stamped on every invoice, and it has been since Roger Castañeda founded Bellows in 1984.

San Anselmo homeowners call us because we’ve seen what their homes are up against. The valley-bottom humidity, the creek flooding history, the wildfire particulate that settled into ducts in 2017, 2019, and 2020. We answer the phone live, 24 hours a day. Not a voicemail, not an app. A real person who can dispatch a background-checked, uniformed technician to zip codes 94960 and 94979, usually same-day or next-day.

Our reviews from San Anselmo customers consistently mention two things: the before-and-after camera inspection, and the fact that the price on the phone matched the price on the bill. No bait coupons, no upsell at the door. One honest price, shown before we lift a single tool.

Our HVAC Cleaning Services in San Anselmo

Evaporator Coil Cleaning

The evaporator coil is where your system meets San Anselmo’s damp valley air, and it’s where we find the most trouble. In homes near San Anselmo Creek, we’ve pulled coils caked with a paste of dust, mold, and fine silt left by past flooding. A dirty coil can’t transfer heat. Your system runs longer, your bills climb, and the humidity in your house never quite breaks. We clean with foaming agents and low-pressure rinses, then treat with Guardsman biocide to slow regrowth in this moisture-heavy climate.

Blower Cleaning

The blower wheel moves every cubic foot of air through your house, and in San Anselmo’s older homes, that air carries more than it should. Pre-1950s duct systems with degraded mastic joints pull in crawl-space debris, rodent droppings, and ash particulate from regional fire events. We remove the blower assembly, clean the wheel and housing with HEPA-contained vacuums, and balance it before reinstall. Most blower cleanings in San Anselmo run $180-$320 as part of a larger service.

Condenser Cleaning

Your outdoor condenser faces the marine layer, the pollen from Red Hill’s oak canopy, and the fine ash that drifts down the Ross Valley during fire season. We wash the coils, straighten the fins, and check the refrigerant lines. A clean condenser in San Anselmo’s mild but humid climate runs 15-20% more efficiently than a clogged one. This is straightforward work, but we still camera-document the condition before and after.

Air Handler Cleaning

The air handler is the heart of the system, and in San Anselmo’s 1920s-1940s housing stock, it’s often sitting in a damp crawl space or a converted closet with no vapor barrier. We clean the cabinet, the drain pan, and the secondary drain lines, then check for standing water that breeds mold. On Red Hill Avenue near the creek, we pulled the covers off a 1930s forced-air system and found 2 inches of creek silt settled in the main trunk line. The homeowner had no idea the flood year of 2017 left residue still circulating. We used a Nikro HEPA vacuum and Rotobrush agitation to remove the silt and treated the coils with Guardsman biocide to prevent regrowth.

Heat Exchanger Cleaning

Furnace heat exchangers in older San Anselmo homes collect soot and corrosion products that reduce efficiency and, in worst cases, create carbon monoxide risks. We inspect with cameras and, where accessible, clean with controlled brushes and HEPA vacuum extraction. This is not DIY work. The heat exchanger is a sealed combustion component, and disturbing it without training is dangerous. We charge $240-$420 for heat exchanger cleaning when done as part of a full system service.

Coil Treatment

After cleaning, we apply EPA-registered coil treatments that inhibit mold and bacterial growth. In San Anselmo’s valley-bottom fog trap, this step matters more than in drier inland towns. The treatment bonds to the coil surface and remains active through the humid season. We include this with most evaporator coil services, or offer it standalone for $120-$180.

Trusted Brands We Service in San Anselmo

We carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, the same brands serious HVAC contractors specify for commercial jobs. For San Anselmo homeowners, this means we don’t need to order parts from a warehouse two counties away. Our trucks stock HEPA filtration rigs, agitation brushes, and biocide treatments sized for the older duct systems common in 94960 and 94979. Most repairs and cleanings are completed in a single visit because the right tool is already on the truck.

Common HVAC Cleaning Problems We See in San Anselmo Homes

• Creek flood aftermath in ductwork. Streets within a block or two of San Anselmo Creek routinely yield duct systems with visible silt lines, mold colonies, and warped flex-duct collars left by past inundation events. This is a neighborhood-specific failure mode that technicians working in higher, drier parts of Marin County almost never encounter.
• Wildfire particulate trapped in aging ducts. Fine ash and smoke from the 2017, 2019, and 2020 fire events infiltrated the original uninsulated ducts of pre-1950s homes, settling in corners and on coil surfaces where standard filter changes can’t reach. HEPA filtration and multi-pass agitation are required to remove it.
• Persistent valley-floor humidity breeding mold. The Ross Valley acts as a fog and moisture trap, keeping San Anselmo measurably damper than Fairfax or Kentfield. Crawl-space ductwork without vapor barriers grows mold and dust mites year-round, not just in winter.
• Degraded mastic joints in original sheet-metal ducts. Craftsman bungalows and Victorian cottages built between 1905 and 1950 carry duct systems with failing seals, pulling in crawl-space air and leaking conditioned air into the dirt below. Cleaning reveals the damage; sealing fixes it.

Pricing for HVAC Cleaning in San Anselmo, CA

We Also Serve Cities Near San Anselmo

Our technicians work throughout Marin County. If you’re in San Anselmo or nearby Fairfax, Kentfield, San Rafael, or Larkspur, we’re already driving your roads. Same pricing, same promise, same live answer on the phone.

FAQs - HVAC Cleaning in San Anselmo