Air Duct Cleaning in Millbrae - One Flat Price, Before-and-After Photos

Fast, Reliable Air Duct Cleaning Across Millbrae

Air duct cleaning in Millbrae typically runs $450 – $850 for a full residential system, and our crews schedule most jobs within a week of your call. If you’re noticing a kerosene-like odor when the wind shifts, or visible dark staining around your supply registers, your ductwork is likely pulling in outside air through corroded seams. Call Hollis Air Duct Cleaning at (361) 326-5060 for a free written estimate before any work begins.

Call (361) 326-5060

We’ve been dispatching crews to Millbrae from our San Francisco Bay Area office since 2004, and we know the local housing stock well. The post-WWII ranch homes off El Camino Real and the 1960s tract houses in Millbrae Meadows weren’t built with the sealed duct systems modern codes require. Original galvanized steel runs with loose joints are common, and in a city sitting directly under SFO’s flight path, that matters more than most homeowners realize. Our technicians arrive uniformed, background-checked, and on time, with Rotobrush rotary systems and Nikro negative-air machines, not shop vacs with brush attachments.

Why Hollis Air Duct Cleaning Is Millbrae’s Preferred Air Duct Cleaning Company

Millbrae homeowners call us back because we price in writing before touching anything, and we stand behind that work for 365 days. The Garrison Standard means no estimate that balloons once the technician is inside your home. If the repair fails within a year, we return and make it right at no charge, including a free second visit. That’s not a slogan; it’s printed on every Hollis invoice.

Our phones are answered by a live person 24 hours a day, 7 days a week. No callback queues, no voicemail loops, no waiting until Monday morning to schedule. When you’re dealing with a kerosene odor blowing through your registers on a Saturday evening, that matters.

We know Millbrae’s neighborhoods. Crews regularly work in Millbrae Meadows, the streets off Chadbourne Avenue, and the older ranches near the BART station. We understand how the morning fog rolling in from the bay interacts with original galvanized ductwork, and we know that a fogging “sanitizer” without source removal is a waste of money in this climate.

Vent Cleaning in Millbrae

Vent Cleaning in Millbrae means more than wiping down register covers. Supply vents in homes near SFO often show dark particulate staining from jet exhaust, tire rubber, and kerosene byproducts that get drawn into leaky duct systems. Return vents collect the usual household dust plus the extra load from coastal humidity that keeps particles sticky and clinging to metal walls. Our process removes the source material with mechanical agitation and negative pressure, then we inspect the trunk lines for gaps that let outside air back in.

A typical residential vent cleaning in Millbrae runs $180 – $340 for supply and return registers on a standard ranch or split-level. Larger homes with more vents, or systems requiring camera inspection first, fall toward the higher end. We count your vents and quote a flat system price before starting, not a per-vent teaser that jumps at the door.

Supply Duct Cleaning

Supply ducts push conditioned air into your rooms. In Millbrae’s older homes, these runs often have corrosion at the seams where decades of humid air have degraded the galvanized coating. We use a Rotobrush rotary system to dislodge buildup, then extract it with negative pressure so debris doesn’t resettle in your living space.

Return Duct Cleaning

Return ducts pull air back to the handler. They’re the pathway where outside contaminants enter if joints are loose. We inspect with a borescope camera, seal accessible gaps with mastic, and clean the full run so your system isn’t recirculating whatever got pulled in from the attic or crawl space.

Air Duct Repair in Millbrae

Air Duct Repair in Millbrae usually involves sealing or replacing sections of original galvanized steel ductwork that have corroded, separated at the seams, or been damaged by moisture and age. The marine climate here, with frequent fog and high humidity, accelerates metal fatigue in ways drier inland cities don’t see. When ducts pull attic air or outside exhaust into the system, you’re not just losing efficiency; you’re circulating contaminants through every room.

Typical duct repair in Millbrae ranges from $280 – $650 for sealing and patching accessible runs, to $900 – $1,800 if sections need full replacement with modern insulated flex or sheet metal. We always inspect first with video, show you what we found, and give you a written price before any cutting or sealing begins.

Duct Sealing and Mastic Application

Loose joints in galvanized trunk lines are the main entry point for SFO-area pollutants and humid outside air. We seal with UL-181 rated mastic, not tape that dries and fails. The goal is stopping infiltration at the source, so your cleaned ducts stay clean and your HVAC system isn’t working overtime to condition outside air.

Section Replacement

When corrosion has eaten through the duct wall or supports have collapsed, patching isn’t enough. We replace with insulated flex duct or rigid sheet metal, properly supported and sealed, so the repair lasts. Every replacement carries the same 365-Day Done Right Promise as our cleaning work.

Trusted Brands We Service in Millbrae

Hollis crews carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies on every Millbrae job. We stock filtration products from Honeywell, Aprilaire, and Guardsman, so if your system needs a media upgrade after cleaning, we can install it same visit without a return trip. That matters for Millbrae homeowners dealing with the extra particulate load from SFO operations, because a standard fiberglass filter won’t catch the fine combustion byproducts that make it through leaky ducts. We size the filtration to your system’s airflow specs, not guess at it.

Common Air Duct Cleaning Problems We See in Millbrae Homes

• Kerosene odors when wind shifts from the northeast. This is unique to Millbrae’s position under SFO’s arrival corridor. Jet exhaust and unburned kerosene get drawn into homes through loose duct joints, especially in older ranches with original galvanized runs. Cleaning alone won’t fix it; the seams need sealing.
• Mold and microbial growth in humid duct runs. The marine layer keeps duct surfaces damp for hours each morning. Combined with dust buildup, this creates colonies that a fogging spray might mask but won’t kill. Source removal with mechanical brushing and negative pressure extraction is the only reliable fix.
• Corroded galvanized steel with internal pitting. Post-WWII and 1960s tract homes throughout Millbrae Meadows and the El Camino corridor still have original ductwork. The zinc coating degrades, steel rusts, and particles flake off into your airflow. Camera inspection reveals the extent before we quote replacement.
• Dirty blower motors and wet-side coil contamination. Coastal fog moisture lets microbial growth colonize the air handler, so even cleaned ducts get recontaminated. A full system cleaning includes the blower assembly and evaporator, not just the trunk lines.

Pricing for Air Duct Cleaning in Millbrae, CA

We Also Serve Cities Near Millbrae

Our crews work throughout the northern Peninsula, including Air Duct Cleaning in Millbrae and surrounding communities. We regularly schedule jobs in San Bruno, Burlingame, South San Francisco, and Pacifica. Each area has its own duct issues, from San Bruno’s hillside pressure differentials to Pacifica’s heavier salt-air exposure, and we adjust our approach accordingly.

FAQs About Air Duct Cleaning in Millbrae