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

Fast, Reliable HVAC Cleaning Across San Francisco

San Francisco homeowners call us when their vents smell musty after a foggy morning, when the heater kicks up dust that hasn’t moved since last winter, or when they realize the ductwork in their 1905 flat was retrofitted sometime in the 1970s and hasn’t been touched since. We’re Bellows Air Duct & Vent Co., and we’ve been sending our HVAC Cleaning crews up the Peninsula and into the city since 1984. Most San Francisco appointments are scheduled within 48 hours, and our technicians know the parking realities of Russian Hill stairways, the narrow service corridors of Tenderloin Victorians, and the rooftop access routes in SoMa conversions. Call (844) 685-6342 and you’ll reach a live person who can give you an honest price before we dispatch a truck.

Call (844) 685-6342

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

We’ve built our reputation in San Francisco on showing up when we say and leaving the job done right - backed in writing for 90 days. Our technicians don’t guess at what’s inside your ducts; they run a camera through every section and show you the footage before and after. That’s not a sales tactic. It’s how we’ve operated for over 42 years.

San Francisco customers tell us the same thing: they hired a cut-rate service that blew air through their vents for twenty minutes and left a mess. Our process takes the time the building demands. In a Victorian flat on Nob Hill, that might mean carefully disassembling access panels in floor chases that were never designed for modern tools. In a SoMa warehouse loft, it means climbing to a rooftop unit that hasn’t been opened since the building’s 1990s conversion.

Calls to our office are answered by a live person, 24 hours a day. No voicemail tree, no app to download. Background-checked, uniformed technicians arrive in marked trucks, and every price is disclosed before a single tool is lifted. The number we quote is the number on the invoice.

Our HVAC Cleaning Services in San Francisco

Evaporator Coil Cleaning

The evaporator coil in your San Francisco air handler sits in cool, damp conditions for months at a time. Without regular air conditioning use to keep air moving, that coil becomes a landing pad for the mold spores and moisture that drift in with Karl the Fog. We remove the coil assembly when accessible, treat it with foaming cleaner, and inspect the drain pan for the algae buildup that’s common in units that cycle rarely. A clean coil moves air properly and stops the musty smell that hits when you finally turn the heat on in November.

Blower Cleaning

The blower wheel in your air handler can accumulate a surprising depth of debris in San Francisco’s older buildings, where return ducts pull air through wall cavities that haven’t been sealed in decades. We remove the blower assembly, clean each blade, and balance the wheel before reinstallation. In Victorian flats with retrofitted ductwork, this often requires working in cramped mechanical closets or crawl spaces that newer cities simply don’t have. Our technicians carry the right tools for tight clearances, not just the standard kit.

Condenser Cleaning

San Francisco’s coastal air carries salt and fine particulate that coat condenser fins, especially in units near the western neighborhoods or on exposed rooftops. We straighten bent fins, clean coils with foaming solution, and verify that airflow isn’t blocked by the ivy or debris that accumulates on low-lying units. For the industrial-grade rooftop condensers common in SoMa warehouse conversions, we coordinate the access and safety protocols those larger systems require.

Air Handler Cleaning

The air handler is where your San Francisco home’s air quality is ultimately determined. We clean the cabinet, treat the interior surfaces for microbial growth, and verify that all access panels seal properly - critical in a climate where fog-driven moisture will find any gap. In buildings with shared mechanical rooms or shaft systems, we also inspect how your unit draws makeup air and whether it’s pulling contamination from neighboring exhaust.

Heat Exchanger Cleaning

San Francisco’s mild winters mean many furnaces see light use, and that intermittent firing pattern leaves combustion residue that doesn’t burn off cleanly. We inspect heat exchangers for cracks, corrosion, and soot buildup that could affect efficiency or safety. In older units serving Victorian flats, we often find exchangers that have been running dirty for years because no previous service included proper access and cleaning. This is not a job for a homeowner with a shop vacuum. The heat exchanger is a sealed combustion component, and disturbing it without training can create a carbon monoxide risk. Our technicians are trained to inspect, clean when appropriate, and recommend replacement when the metal has degraded.

Coil Treatment

After cleaning, we apply EPA-registered antimicrobial treatments to coil and drain pan surfaces. In San Francisco’s fog-driven moisture environment, this step matters more than in drier inland markets. We use products from Abatement Technologies and Aprilaire that are specified for HVAC applications, not general-purpose sprays. The treatment inhibits mold regrowth without leaving a coating that restricts heat transfer.

Trusted Brands We Service in San Francisco

We carry professional-grade equipment and replacement components from Rotobrush, Abatement Technologies, and Aprilaire - the same brands serious HVAC contractors specify for commercial and residential installations. For San Francisco customers, this means we don’t need to special-order parts from out of state and make you wait. Our trucks stock the common coil treatments, drain pan assemblies, and access hardware that aging San Francisco systems need. When we encounter an industrial-grade rooftop unit in a SoMa loft conversion, we have the relationships with distributors who can source components for Honeywell and Guardsman controls that those systems often run on. Fast turnaround matters when your heat is out in a San Francisco January, and we keep the parts on hand to make that happen.

Common HVAC Cleaning Problems We See in San Francisco Homes

• Sharp bends in retrofitted ductwork trap debris. Victorian and Edwardian flats in Nob Hill, the Tenderloin, and Russian Hill have ductwork crammed into wall cavities and floor chases never engineered for it. Standard brush tools can’t navigate these tight angles, so we disassemble access points and clean manually.
• Fog-driven moisture condenses in stagnant ducts. San Francisco’s daily fog cycle pushes moisture into poorly insulated duct runs, and the city’s mild temperatures mean most residents rarely run air conditioning. Without regular airflow, that moisture sits and breeds mold that a dry-vacuum cleaning will not remove.
• Grease film from commercial kitchen exhaust contaminates residential supply ducts. In Chinatown and the Mission, upper-floor flats often draw makeup air through shared shafts adjacent to restaurant exhaust. We’ve cleaned supply ducts coated in cooking particulate from tenants who have never fried an egg in their own kitchen.
• SoMa warehouse lofts have untouched industrial ductwork. Buildings converted in the 1990s and 2000s frequently left original rooftop HVAC and duct distribution systems in place. The large flex ducts spanning open floor plates collect years of moisture-warped insulation and mold colonies that standard residential cleaning approaches miss entirely.

Pricing for HVAC Cleaning in San Francisco, CA

We Also Serve Cities Near San Francisco

Our technicians regularly work in the San Francisco neighborhoods of Mission District, Noe Valley, and Chinatown, and we cross the county line into Daly City for customers with properties on the Peninsula side. Same scheduling, same upfront pricing, same 90-Day Done Right Promise.

FAQs - HVAC Cleaning in San Francisco