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 Mountain View
Duct sealing in Mountain View typically runs $800 – $2,400 for a whole-house job, with most Eichler and ranch homes falling in the $1,200 – $1,800 range depending on whether we find slab-embedded runs or crawlspace routing. We’re the Duct Sealing crew that serves Mountain View from our San Francisco Bay Area dispatch office, and we know the local housing stock: the 1950s – 70s slab-on-grade ranches in Monta Loma, the Eichlers in Waverly Park with their original galvanized ductwork buried in concrete, and the newer tight duct chases in North Bayshore townhomes. Our technicians arrive uniformed, background-checked, and equipped with camera inspection gear, HEPA-contained negative-air systems, and professional-grade sealing mastic. Call (361) 326-5060 for a free estimate. We’ll give you a written price before any work starts, and every job carries our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Mountain View’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Mountain View reputation is built on showing up inside the quoted window, pricing in writing, and leaving the site clean. Homeowners in Mountain View call us back because our technicians follow The Garrison Code: arrive prepared, explain what they find, and never start work until the homeowner sees and signs off on the exact price.
Our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday for a scheduling question. Dispatch is coordinated from our San Francisco Bay Area office, and crews serve Mountain View neighborhoods directly. That means we understand the local conditions: the seasonal inversion layer that traps wood smoke and traffic particulates against the Santa Cruz Mountains foothills, the spring pollen events, and the wildfire smoke that pushes residents to seal their ducts as an indoor-air-quality measure.
Every repair is covered by our 365-Day Done Right Promise in writing. If the work fails within a year, Hollis returns and makes it right at no charge, including a free second visit. Our equipment roster includes Rotobrush rotary brush systems, Nikro negative-air machines, and filtration products from Honeywell, Aprilaire, Abatement Technologies, and Guardsman. These are the same tools commercial crews use, not hardware-store gear, and we explain what each one does for your specific Mountain View home before we start.
Duct Insulation in Mountain View
Duct Insulation in Mountain View addresses a problem most homeowners don’t know they have: conditioned air bleeding into unconditioned spaces through thin or degraded duct walls before it ever reaches the register. In Mountain View’s 1950s – 70s ranch and Eichler homes, original ductwork was often installed with minimal or no insulation, especially in slab-embedded runs and crawlspace routing where access is tight and contractors cut corners. We wrap supply ducts with formaldehyde-free fiberglass insulation jacket or closed-cell foam wrap, depending on the application, and we always seal joints first so we’re not insulating a leak. A typical duct insulation job in Mountain View runs $600 – $1,500 for partial systems and $1,200 – $2,800 for whole-house coverage.
When Insulation Beats Replacement
Many Monta Loma homeowners assume corroded galvanized ducts need full replacement, but if the metal is structurally sound and the corrosion is surface-only, insulation plus sealing often restores performance at half the cost. We camera-inspect first and show you what we see before recommending either path.
North Bayshore and Downtown Townhomes
Newer Mountain View construction uses tighter duct chases with less clearance. Our crew sizes insulation to fit without compressing the R-value, and we use low-VOC adhesives that won’t off-gas in small mechanical closets.
HVAC Duct Sealing in Mountain View
HVAC Duct Sealing in Mountain View is where we spend most of our time, because the city’s housing stock is uniquely prone to leakage. The original Eichler and ranch homes in Waverly Park and Monta Loma were built with galvanized steel ductwork that has now had 60 – 70 years to corrode, separate at joints, and crush in slab penetrations. We seal with water-based mastic reinforced with fiberglass mesh at joints and seams, plus aerosolized duct sealant for inaccessible runs. A typical HVAC duct sealing job in Mountain View costs $800 – $2,400, with most homes in the $1,200 – $1,800 range. That price includes camera inspection, HEPA-contained source removal if needed, and all materials.
Camera Inspection First
We never seal what we haven’t seen. Our techs run a borescope through every accessible run to map joint separation, corrosion, and crushed sections. In slab-embedded ducts, this step is non-negotiable. Sealing over active corrosion or a separated joint traps debris that later flakes into your blower motor.
Negative-Air Containment
When we disturb decades of silica dust and rodent debris in unsealed crawlspaces, we set up Nikro negative-air machines with HEPA filtration before touching anything. This prevents contamination of your living space during the sealing process.
Trusted Brands We Service in Mountain View
We stock parts and materials from Aprilaire, Abatement Technologies, and Guardsman for Mountain View jobs, which means faster turnaround and no waiting for specialty orders on standard sealing and insulation work. Aprilaire’s ventilation controls integrate well with the variable-speed systems common in newer Mountain View infill construction. Abatement Technologies HEPA filtration is what we deploy on every slab-embedded and crawlspace job in Waverly Park and Monta Loma. Guardsman duct coatings and sealants hold up in the high-humidity conditions we sometimes find in unvented crawlspaces beneath older Mountain View ranches. We don’t list every brand to impress you. We name the ones we actually use on your street, in your neighborhood, because that’s what affects whether the job gets done this week or next.
Common Duct Sealing Problems We See in Mountain View Homes
- Slab-embedded joint separation in Eichlers. The original 1960s duct runs in Waverly Park Eichlers were set directly in concrete with no expansion accommodation. Sixty years of thermal cycling has separated joints at slab penetrations, pulling crawlspace air and construction dust into supply ducts. Camera inspection finds it; HEPA-contained removal and mastic sealing fixes it.
- Internal corrosion in galvanized steel. Mountain View’s mild climate means year-round HVAC use, and the condensation cycles inside uninsulated galvanized ducts have corroded the interior surface. Sealing over this without source removal traps loose rust and scale that later clogs blower motors and fouls evaporator coils.
- ADU and renovation dust infiltration. Mountain View’s ADU boom has contractors cutting concrete and drywall while original duct systems remain active. Disconnected return ducts pull silica dust directly into the air handler, and sealing the wrong joint leaves the actual source unaddressed. We map the system before we seal anything.
- Crushed runs behind slab penetrations. The low-clearance slab construction in Monta Loma ranches often means duct runs were compressed during original pour or subsequent foundation work. Reduced airflow raises static pressure and noise; sealing alone won’t fix it, but our camera inspection catches it before we quote.
Pricing for Duct Sealing in Mountain View, CA
Whole-house duct sealing in Mountain View typically runs $800 – $2,400. Most 1,200 – 2,000 square foot Eichler and ranch homes fall in the $1,200 – $1,800 range. Duct insulation adds $600 – $1,500 for partial systems or $1,200 – $2,800 for whole-house coverage. What moves the price: accessibility (slab-embedded and crawlspace runs take longer), extent of corrosion or joint separation found during camera inspection, whether HEPA-contained source removal is needed before sealing, and square footage of the home.
We give one flat price per system, agreed in writing before work starts. No per-vent pricing, no add-ons at the door. You’ll see the exact number on paper before we touch a tool. Estimates are free, and we bring camera inspection equipment to every quote so we’re pricing what actually needs doing, not guessing. Call (361) 326-5060 for your written estimate.
We Also Serve Cities Near Mountain View
Our crews regularly work in Los Altos, Sunnyvale, Stanford, and Cupertino. Each city has different housing stock and different duct problems. Sunnyvale’s taller attics make access easier. Los Altos hills homes see more wildfire smoke exposure. We adjust our approach accordingly. Duct Sealing in Mountain View remains our core focus in this corridor, and we schedule neighboring cities to keep routes efficient without making Mountain View homeowners wait.
Serving Mountain View, CA - Our Local Coverage Area
We’re based in the Mountain View 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 Mountain View
Yes, we seal slab-embedded ducts regularly in Waverly Park, but the process is different from attic-mounted systems. We start with camera inspection to map joint separation and corrosion, then set up HEPA-contained negative-air source removal before applying mastic and mesh. The slab limits access, so we use aerosolized sealant for some runs and manual application where we can reach. Call (361) 326-5060 for a free estimate – we’ll camera-inspect and give you a written price before any work starts.
Sealing is often the better value if the metal is structurally sound. We camera-inspect first to check for through-corrosion or crushed sections. Surface corrosion with intact metal can be cleaned, sealed, and insulated for roughly half the cost of full replacement. If we find structural failure or multiple crushed runs, we’ll show you and quote both options. Call (361) 326-5060 and we’ll give you the facts to decide.
Your return duct system is pulling dust from the construction zone through a disconnected or unsealed joint. This is common in Mountain View’s ADU boom. We map the return path with camera inspection, identify the leak point, and seal it after HEPA-contained source removal. Sealing downstream joints without finding the actual source is a mistake we see other crews make. Call (361) 326-5060 – we’ll find the real problem and fix it.
Most Mountain View homes benefit from inspection every 3 – 5 years, with sealing as needed when camera inspection finds leakage. Homes with slab-embedded ducts, recent construction nearby, or occupants with respiratory sensitivity may need more frequent checks. We don’t sell maintenance plans or push unnecessary work – we camera-inspect, show you the condition, and let you decide. Call (361) 326-5060 to schedule.
We adapt equipment to the job. North Bayshore and downtown townhomes have tighter, more complex duct chases that need smaller rotary brush heads and more flexible camera gear. The sealing principles are the same, but the access strategy changes. Our Rotobrush and Nikro systems have interchangeable components for exactly this reason. Call (361) 326-5060 and we’ll match the tool to your specific Mountain View building type.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Mountain View since 2004.