Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Air Duct Cleaning Across Alamo
Air duct cleaning in Alamo typically runs $450 – $850 for a full residential system and $1,200 – $2,500 for larger estate properties with multiple zones. Most jobs are scheduled within a few days and completed in a single visit. If you’re calling from anywhere along Danville Boulevard, up in the Westside Alamo hills, or out near the multi-acre spreads off Stone Valley Road, our crews know the drive and the ductwork you’re dealing with. Dispatch and scheduling are coordinated from our San Francisco Bay Area office, but the technicians who arrive at your door serve Alamo properties regularly. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Alamo’s Preferred Air Duct Cleaning Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Air Duct Cleaning team has built a reputation in Contra Costa County by doing what we said we’d do. Alamo homeowners aren’t looking for the cheapest coupon in the mailbox; they’re looking for a crew that shows up uniformed, prices the job in writing before touching anything, and doesn’t disappear if something isn’t right.
Our 365-Day Done Right Promise covers every job in writing. If the work fails within a year, we return and make it right at no charge, including a free second visit. No negotiation, no runaround.
Every technician is background-checked and uniformed. You know who’s walking into your home before they arrive. And when you call (361) 326-5060, a live person answers the phone, 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday.
We know Alamo’s properties: the 1960s ranch-style homes near Hap Magee Ranch Park, the custom builds from the 1980s off Livorna Road, the newer luxury construction up in the hills. The ductwork differs in every era, and so does the right approach to cleaning it.
Ductwork Cleaning in Alamo
Ductwork Cleaning in Alamo means more than vacuuming floor registers. Most estates here sit on half-acre to multi-acre lots with long, zone-divided duct runs, and many systems’ dirtiest branch is the second-floor bonus-room run buried in the attic. That attic often exceeds 140°F in summer, which bakes flex duct insulation and lets oak pollen and ash infiltrate the supply side before any register looks dirty. We clean the full system: supply trunks, return plenums, branch lines, boots, and registers, using rotary brush agitation and negative-air HEPA containment.
A typical residential ductwork cleaning in Alamo runs $450 – $850. Larger homes with four or more zones, or properties with detached systems in guest houses or workshops, often fall in the $1,200 – $2,500 range. Every price is written down before we start.
Supply and Return Cleaning
Supply ducts push conditioned air into your rooms; returns pull it back to the air handler. In Alamo’s older homes with original galvanized ductwork, returns often collect the heaviest loading because they’re under negative pressure and draw in attic dust through every gap. We isolate and clean both sides separately so debris isn’t pushed from one into the other.
Multi-Zone Estate Systems
Large Alamo properties frequently have three, four, or more HVAC zones with dampers and extended trunk lines. Each zone gets individual attention. We don’t clean the main trunk and call the job done while bedroom branches two stories up still hold years of buildup.
Air Duct Inspection in Alamo
Air Duct Inspection in Alamo should happen before any cleaning proposal is finalized, especially for homes built between the 1960s and 1990s. We run a lighted video camera through the full duct network to document condition, locate crushed or disconnected sections, and identify whether you’re looking at a cleaning job or a repair-and-replace situation. A standard video inspection in Alamo costs $150 – $250, and that fee is credited toward your cleaning if you proceed with the work.
On a Westside Alamo property off Danville Boulevard, our tech camera-inspected a 1990s two-zone system and found the bonus-room supply duct crushed under blown insulation and its inner liner coated with a mat of valley oak pollen and drywall dust. After setting up negative pressure with HEPA filtration and running agitation tools, we pulled source removal on the returns and hand-cleaned the registers. The homeowner noticed the musty smell gone and the upstairs zone finally reaching setpoint.
Older Ductwork Assessment
Galvanized steel and early flex ductwork from the 1970s and 1980s deteriorates differently than modern materials. We check for rust-through, separated liners, and collapsed sections that make cleaning pointless until repair is done. You’ll see the video. We explain what it means. Then you decide.
Post-Cleaning Verification
After cleaning, we re-camera critical runs to confirm debris removal and document the condition we left behind. In Alamo’s competitive real estate market, that documentation helps if you’re selling or refinancing.
Trusted Brands We Service in Alamo
Our equipment roster includes Rotobrush rotary brush systems, Nikro negative-air machines, and filtration products from Honeywell, Aprilaire, and Abatement Technologies. These are the same tools commercial crews use in hospitals and schools, not hardware-store gear. For Alamo customers, this means we can source replacement media, HEPA filters, and specialized fittings without waiting on cross-country shipping. If your system uses Honeywell electronic air cleaners or Aprilaire media cabinets, we stock the correct replacement sizes and can install them during the same visit as your cleaning.
Common Air Duct Cleaning Problems We See in Alamo Homes
- Attic bonus-room runs neglected for years. Homeowners rarely access these ducts, and the extreme heat buildup in Alamo’s unconditioned attics degrades flex duct insulation, leading to energy loss and dust infiltration long before the system shows obvious symptoms.
- Original galvanized or early flex ductwork deteriorating unseen. Many Alamo homes built from the 1960s through the 1980s still have duct materials that weren’t designed for forty-plus years of service. Torn liners re-contaminate the system within weeks of a surface cleaning if the damage isn’t found and addressed.
- Outbuilding and detached-garage systems loaded with wood-heat soot and road dust. On multi-acre Alamo properties, workshops, guest houses, and pool houses often have independent duct systems or minisplit connections that never trigger a main-house filter change but accumulate heavy debris from unpaved access roads and seasonal wood burning.
- Wildfire smoke and ash drawn into returns during Diablo Valley fire season. When air quality drops and homeowners run systems on recirculate, fine particulate still finds its way into ductwork through envelope leakage. Post-season cleaning removes what filters missed.
Pricing for Air Duct Cleaning in Alamo, CA
Here’s what honest pricing looks like for Air Duct Cleaning in Alamo. A typical single-zone residential system runs $450 – $650. Two- to three-zone homes common off Livorna Road and near Hap Magee Ranch Park fall in the $650 – $1,100 range. Large estates with four or more zones, outbuilding systems, or extensive attic duct networks typically run $1,200 – $2,500. Every quote is one flat price per system, agreed in writing before we touch anything. No per-vent add-ons, no equipment fees that appear at the door, no bait-and-switch.
What moves the price: number of HVAC zones, accessibility of attic and crawlspace runs, whether video inspection reveals damage requiring repair before cleaning, and whether detached structures need service. We show you the camera footage. We explain the scope. You get the written price. Then you decide. Call (361) 326-5060 for your free estimate.
We Also Serve Cities Near Alamo
Our crews regularly work in Walnut Creek, Moraga, Lafayette, and Danville, so if you have rental properties, family nearby, or you’re relocating within the Diablo Valley, the same standards and the same written pricing travel with us. Each job gets the same 365-Day Done Right Promise, whether it’s a condo off Boulevard Way in Walnut Creek or an estate off El Cerro Boulevard in Danville.
Serving Alamo, CA - Our Local Coverage Area
We’re based in the Alamo 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 About Air Duct Cleaning in Alamo
Every three to five years for most Alamo acreage properties, though homes with unpaved access roads, active wood heat in outbuildings, or sensitive occupants may need cleaning every two to three years. The oak pollen load from surrounding woodlands and dust from gravel drives accelerates buildup compared to paved suburban streets. Call (361) 326-5060 and we’ll assess your specific property conditions.
Yes. These runs are often the dirtiest part of the system because they’re under the most thermal stress and least likely to be inspected by homeowners. The 140°F attic heat degrades flex duct seals and lets pollen and ash infiltrate. We isolate and clean each attic branch individually rather than just treating the main trunk.
It means fine particulate and ash enter your system through envelope leakage even when you’re running on recirculate, and standard HVAC filters catch only a fraction of it. Post-season inspection and cleaning removes what filters missed and restores system efficiency before the next heating season. We recommend scheduling in October or November, after the peak fire risk passes but before heavy heating use begins.
Yes. We regularly clean independent duct systems and minisplit connections in workshops, guest houses, pool houses, and detached garages on Alamo’s larger properties. These systems often have heavier debris loading than the main house due to wood-heat soot and road dust, and they’re easy to overlook. We’ll include them in your written scope if you want them serviced.
We camera-inspect for debris loading, disconnected or crushed duct sections, deteriorated flex duct liner, rust in galvanized steel, and signs of pest intrusion. In Alamo’s 1960s-through-1990s housing stock, we especially look for original duct materials that have exceeded their service life. You’ll see the video. We’ll explain what needs cleaning, what needs repair, and what can wait.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Alamo and the greater San Francisco Bay Area since 2004.