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 Duct Sealing Across Petaluma
Duct sealing in Petaluma typically runs $800 – $2,400 for a whole-home system, with most single-family jobs falling between $1,200 and $1,800. We dispatch crews from our San Francisco Bay Area office and serve Petaluma homes directly, including the Victorian blocks near downtown, the east-side tract neighborhoods, and riverfront properties along the Petaluma River corridor. Call (361) 326-5060 for a free written estimate before any work starts.
We’re familiar with the specific headaches Petaluma homeowners face: octopus gravity furnaces in pre-1930 houses with rusted, undersized ductwork; flexible ducting in 1970s – 1990s tract homes that has loosened at the collars; and multi-unit conversions where shared dryer stacks complicate any airflow fix. Our technicians carry mastic, mesh reinforcement, and negative-air HEPA setups sized for both tight crawlspaces and larger modern systems. Every job gets a written price upfront and is covered by our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Petaluma’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004, and our Duct Sealing in Petaluma crews operate under The Garrison Standard: arrive inside the quoted window, price in writing before touching equipment, complete the job by the book, and leave the site clean. That standard matters especially in Petaluma, where dense Victorian housing, restricted street parking, and floodplain moisture create sealing challenges that inland crews rarely encounter.
Our technicians are background-checked and uniformed. You’ll know who’s arriving before they knock. Phones are answered by a live person 24 hours a day, 7 days a week, no voicemail loops. And every repair is backed by our 365-Day Done Right Promise in writing: if the work fails within a year, we return and make it right at no charge, including a free second visit.
We’ve learned Petaluma’s building stock through repeated calls to the same neighborhoods: the octopus gravity systems near Kentucky Street and Western Avenue, the mid-century ranches off McDowell Boulevard, the condo conversions downtown where shared dryer stacks run through original chases. That accumulated local knowledge means we diagnose faster and scope more accurately than crews treating Petaluma as just another stop on a regional route.
Duct Insulation in Petaluma
Duct Insulation in Petaluma addresses a problem most homeowners don’t notice until their winter heating bills spike or their summer cooling never reaches the second floor: thermal loss through uninsulated or poorly insulated ductwork running through attics, crawlspaces, and garages. In Petaluma’s climate, cool foggy mornings and seasonal rain keep crawlspaces and attics damp year-round, which compresses and degrades fiberglass insulation faster than in drier inland counties. We typically see insulation replacement or augmentation needed every 10 – 15 years in river-adjacent homes, sooner if rodents have nested. For a typical Petaluma home, duct insulation runs $600 – $1,500 depending on linear footage, accessibility, and whether we’re working around an active octopus gravity system or modern flexible ducting.
Condensation Control in Humid Crawlspaces
Uninsulated metal ducts in Petaluma crawlspaces sweat during fog season. That moisture drips onto subflooring, breeds mold, and rusts out duct seams from the outside in. We wrap supply and return trunks with formaldehyde-free fiberglass or closed-cell foam board, sealed at all joints, to keep the air inside the duct thermally separated from the damp air outside.
Insulating Around Historic Octopus Systems
Original octopus gravity furnaces in Petaluma Victorians have large, awkward trunk lines that standard insulation sleeves won’t fit. Our crew fabricates custom insulation blankets with reinforced facing, secured without compressing the airflow path. The goal is the same: stop thermal loss without choking a system that was already undersized by modern standards.
HVAC Duct Sealing in Petaluma
HVAC Duct Sealing in Petaluma closes the leaks, gaps, and disconnected collars that waste conditioned air and pull unfiltered crawlspace or attic air into your supply. In Petaluma’s dense pre-1930 housing, we regularly find octopus gravity systems with open joints in crawlspaces that have been wet for decades; in east-side tract homes, flexible ducting has pulled loose at registers or sagged to form debris-collecting traps. Sealing restores designed airflow, reduces blower runtime, and stops the pressure imbalances that draw mold spores and rodent droppings into living spaces. A typical HVAC duct sealing job in Petaluma costs $1,200 – $1,800 for a single-family home with accessible crawlspace, with larger homes or multi-unit scopes running higher.
Mastic-and-Mesh Sealing for Metal Ducts
We brush water-based mastic into every joint, seam, and penetration, then embed fiberglass mesh for structural reinforcement. Unlike foil tape, which peels in damp crawlspaces, mastic remains flexible and airtight for decades. We pair this with a negative-air HEPA setup to capture any disturbed debris before it enters the home.
Flexible Duct Collar Repair and Replacement
Flexible ducting common in Petaluma’s 1960s – 1990s tract homes degrades at connection points. We cut back failed sections, install new collars with mechanical fasteners, and seal with mastic rather than clamp-only connections that loosen under vibration. Where flexible duct has been damaged by pests or compression, we replace the run and suspend it properly to prevent future sagging.
Trusted Brands We Service in Petaluma
Our Petaluma crews carry professional-grade equipment from Nikro for negative-air containment, Honeywell and Aprilaire filtration components, and Abatement Technologies HEPA systems. We stock common collar sizes, mastic formulations rated for damp crawlspaces, and insulation materials suited to Petaluma’s moisture conditions. That local parts inventory means most jobs finish in one scheduled visit rather than two, and our technicians can adapt on-site when they encounter the unexpected: a rusted-out octopus trunk that needs custom fabrication, or a shared dryer stack that requires coordination with a neighboring unit. We don’t run to the supply house mid-job. The equipment is in the van, the pricing is written before we start, and the work is done by the book.
Common Duct Sealing Problems We See in Petaluma Homes
- Moisture-locked crawlspaces after river flooding. Sealing duct joints in a river-adjacent Victorian without first drying the crawlspace locks seasonal dampness into the supply and return ducts, so mold returns within a season. We scope vapor-barrier work alongside sealing in floodplain homes.
- Restricted parking forcing incomplete source removal. In dense downtown and riverfront blocks, street parking limits force crews to run long hose runs and undersized negative pressure setups, leaving debris in place before sealing begins. We schedule equipment staging and building access in advance to avoid this shortcut.
- Shared dryer vent stacks pressurizing sealed duct systems. Multi-unit conversions often treat dryer stacks as a separate job from duct sealing, leaving the lint pathway pressurized and feeding moisture and lint back into the newly sealed system. We inspect and address the full airflow path.
- Undersized octopus trunks choking modern HVAC retrofits. Petaluma homeowners who upgrade to forced-air systems sometimes leave original octopus supply ducts in place. The mismatch creates high static pressure, blower strain, and leaks at every joint. We resize or replace trunk lines to match the new equipment’s airflow requirements.
Pricing for Duct Sealing in Petaluma, CA
A typical duct sealing job in Petaluma runs $800 – $2,400 for the full system. Single-family homes with accessible crawlspaces usually fall in the $1,200 – $1,800 range. Duct insulation alone is typically $600 – $1,500. What moves the number: linear footage of ductwork, accessibility (tight crawlspaces take longer), whether we’re working around an active octopus gravity system, and whether moisture remediation or shared stack coordination is needed alongside the sealing work.
We do not quote per-vent teaser prices that balloon once the technician is inside. We give one flat price per system, agreed in writing before any work starts. That price includes all materials, labor, and the 365-Day Done Right Promise. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Petaluma
Our crews regularly travel to Duct Sealing jobs in Cotati, Rohnert Park, Novato, and Boyes Hot Springs. The same written pricing, same background-checked uniformed technicians, same 365-Day Done Right Promise applies in every city we serve from the Petaluma area.
Serving Petaluma, CA - Our Local Coverage Area
We’re based in the Petaluma 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 Duct Sealing in Petaluma
Yes, but only if the scope addresses moisture first. Petaluma’s river-adjacent Victorians have octopus systems running through chronically damp crawlspaces; sealing leaks without drying the space traps humidity and grows mold inside the newly sealed ducts. We typically pair crawlspace vapor-barrier assessment with mastic-and-mesh sealing on these jobs. Call (361) 326-5060 for an exact scope and written price.
Yes. We coordinate building access and equipment staging in advance, scheduling around your building’s loading restrictions and parking availability. Our negative-air HEPA setups are sized for tight urban jobs, and we carry equipment that fits through standard doorways and elevators rather than requiring crane or street-block access. Call (361) 326-5060 to discuss your building’s specific access situation.
Shared dryer stacks are common in Petaluma’s Victorian and mid-century conversions, where original building chases were repurposed rather than installing separate venting for each unit. The shared path creates pressure imbalances and backdrafting that can push lint and moisture into adjacent ductwork. We inspect the full stack as part of any duct sealing scope and coordinate with neighboring units when cleaning or repairs are needed. Call (361) 326-5060 to schedule a camera inspection.
It can, but only if the root cause is duct leakage pulling crawlspace or attic air into your supply. If the mustiness is coming from mold growth inside the ducts themselves, sealing alone won’t remove it; we may recommend cleaning or replacement first. We diagnose the source with camera inspection before quoting any work. Call (361) 326-5060 for a free assessment.
We use Nikro negative-air machines for containment, Honeywell and Aprilaire filtration components, and Abatement Technologies HEPA systems for debris capture during the sealing process. Mastic and mesh materials are rated for damp-crawlspace application. All equipment is professional-grade, not hardware-store gear, and our technicians are trained on its proper use. Call (361) 326-5060 for specifics on your job’s equipment needs.
We were called to a multi-unit Victorian conversion off Kentucky Street where the upstairs tenant complained of musty air and a weak blower motor. Camera inspection showed the original octopus system’s undersized supply and return ducts had open joints in the crawlspace, and the shared dryer stack ran through the same chase. We set up negative pressure with HEPA filtration, sealed the joints with mastic and mesh, and rebalanced the registers; the static pressure dropped and the musty smell cleared.
Because so much of central Petaluma is dense pre-1930 Victorian and Craftsman housing on the river floodplain, duct sealing here is often a moisture-control job as much as an airflow job – sealing leaks in an old octopus gravity system without addressing crawlspace humidity just traps damp air in the supply and return ducts. The result is that Petaluma sealing scopes frequently pair crawlspace vapor work with mastic-and-mesh sealing, which is not the standard inland Santa Rosa approach. We’ve learned this through repeated calls to homes near the river, where homeowners had already paid for sealing elsewhere and found mold returning within a season. The fix isn’t more sealing; it’s sealing done after the moisture source is controlled.
Ready to stop losing conditioned air and pulling crawlspace moisture into your home? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free written estimate. We’ll inspect your system, explain what we find in plain terms, and give you one flat price per system before any work begins. Every job is covered by our 365-Day Done Right Promise: if it’s not right, we make it right, including a free return visit.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Petaluma and the Bay Area since 2004.