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 Bostonia
Duct sealing in Bostonia typically runs $850 – $2,400 for a whole-home system, depending on whether we’re addressing accessible attic runs or sealed crawl spaces in the area’s older tract homes. Most Bostonia jobs are scheduled within a few business days, with our Duct Sealing team dispatching from our San Diego coordination office to reach the foothill neighborhoods quickly. We’ve worked the 1970s – 80s housing stock around Bostonia long enough to know which joints fail first, where the Santa Ana winds push ash into trunk lines, and why a tape patch never lasts on galvanized steel that’s been expanding and contracting for forty-plus years.
Call (361) 326-5060 for a free written estimate. We price every Bostonia job before we start, and that price is backed by our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Bostonia’s Preferred Duct Sealing Company
Hollis has been part of the Garrison Partners family since 2004, and our crews have handled enough Bostonia homes to recognize the local pattern: original galvanized-steel ducts in the tract builds off Bostonia and Main Street, under-belly flex systems in the manufactured home parks, and the same post-Santa Ana ash layer showing up in return trunks every fall. We don’t guess. We inspect with a camera, write the price down, and seal with Guardsman mastic and mechanical fasteners that hold up to the thermal cycling these systems see.
Our technicians are background-checked and uniformed, and they arrive inside the quoted window. Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues. If the seal fails within a year, we come back and make it right at no charge, including a free second visit. That’s not a slogan; it’s written on every Bostonia job sheet.
HVAC Duct Sealing in Bostonia
HVAC Duct Sealing in Bostonia means addressing the specific failure modes of foothill housing: pinhole leaks at galvanized-steel joints that pull in ash-laden outdoor air during Santa Ana wind events, separated flex-duct connections in attic runs that bake to brittleness in summer, and under-belly systems in manufactured homes where rodent intrusion creates new leak paths faster than standard tape can cover. A typical whole-home HVAC duct sealing job in Bostonia runs $850 – $1,800 for accessible attic and crawl-space work, with sealed or buried systems pushing toward the higher end.
We use Rotobrush agitation tools for pre-seal cleaning when ash and debris have accumulated, then seal with mastic rated for the temperature swings these ducts see. The goal is simple: stop conditioned air from escaping, stop unfiltered outdoor air from entering, and do it with materials that outlast the season.
Attic and Crawl-Space Sealing
Most Bostonia tract homes have duct runs in the attic or a partial crawl space, where summer temperatures exceed 140°F and bake adhesive tapes to failure. We use mechanical fasteners plus Guardsman mastic, applied to clean metal, so the seal holds through thermal expansion cycles that would lift standard foil tape within a year.
Manufactured-Home Under-Belly Systems
Bostonia’s manufactured home parks have a distinct challenge: flexible duct suspended in a ventilated under-belly cavity, exposed to rodent activity and ground moisture. Sealing here requires inspecting for intrusion points first, then using reinforced mastic and protective wrap, not just tape over a tear that’ll reopen.
Duct Repair in Bostonia
Duct Repair in Bostonia often starts with a homeowner noticing uneven temperatures, a spike in their SDG&E bill, or that fine ash film reappearing on supply registers days after cleaning. The root cause is usually deteriorated original ductwork: separated joints in galvanized-steel trunk lines, collapsed flex sections in attic runs, or rodent damage in under-belly systems. A typical duct repair in Bostonia runs $300 – $850 for localized fixes, with full section replacement on larger trunk lines reaching $1,200 – $2,400.
We don’t quote repair until we’ve run a camera and found the actual break. That’s part of The Garrison Standard: diagnose before you price, price before you touch it. Our written estimate shows exactly which sections need repair, which can be sealed, and what the total is. No per-foot add-ons once we’re in your attic.
Section Replacement vs. Spot Sealing
Some Bostonia galvanized trunks are too far gone for sealing, pinholed through the metal itself. We replace those sections with modern sheet metal or insulated flex, depending on the run, and seal the new connections properly. Spot sealing is only recommended where the metal is sound and the joint is the sole failure point.
Post-Wildfire Damage Assessment
After a significant wildfire season, we inspect Bostonia homes for heat-distorted flex duct and intake vents that drew in smoke-laden air. The damage isn’t always visible from the register side; camera inspection finds the scorched or collapsed sections that need repair before sealing makes sense.
Trusted Brands We Service in Bostonia
Our Bostonia crews carry professional-grade equipment from Rotobrush, Nikro, and Guardsman, the same tools we use on commercial jobs across San Diego County. For filtration upgrades after sealing, we stock Honeywell and Aprilaire media filters sized to the systems common in Bostonia’s 1970s – 80s tract homes, many of which were originally fitted with undersized 1-inch frames that don’t handle foothill dust loads. We keep Guardsman mastic and mechanical fastening hardware on every van, so most Bostonia repairs don’t wait on parts. If your system needs a specialty component, our San Diego coordination office sources it fast, and we schedule the return visit before we leave the first time.
Common Duct Sealing Problems We See in Bostonia Homes
- Santa Ana ash intrusion through deteriorated trunk joints. After every fall wind event, we find fine ash and charred debris packed into the first few feet of main trunk lines in Bostonia homes, especially along the foothill edges near Bostonia and Main Street. The ash moves past the filter, clings to duct walls, and recirculates until the joints are sealed and the debris is source-removed.
- Tape failure on original galvanized-steel expansion joints. Bostonia’s 1970s – 80s tract homes used steel that expands and contracts daily with heating and cooling. Standard foil tape loses adhesion within a season; we see the same joints “repaired” three times before a homeowner calls us for mastic and mechanical fasteners that actually hold.
- Rodent-compromised under-belly flex in manufactured homes. Bostonia’s manufactured home parks have ventilated under-belly cavities that rodents access through skirting gaps. They tear flex duct for nesting material, creating leak paths that a surface seal won’t fix. We seal only after excluding the intrusion point and replacing damaged sections.
- Smoke smell persistence after filter changes. Bostonia homeowners often replace their HVAC filter after wildfire smoke and assume the problem is solved. But fine ash has already moved past the air handler and adsorbed onto trunk-line walls. Duct sealing without source removal leaves the contaminant in place; the smell returns when the system cycles on.
Pricing for Duct Sealing in Bostonia, CA
A typical whole-home duct sealing in Bostonia runs $850 – $2,400. Most standard tract homes with accessible attic and crawl-space ductwork fall in the $850 – $1,800 range. Sealed or buried systems, extensive manufactured-home under-belly work, or jobs requiring significant section replacement before sealing can reach $1,800 – $2,400. We don’t quote per vent or per foot; we price per system, agreed in writing before any work starts.
What moves the number: accessibility (attic vs. sealed crawl space), condition of existing ductwork (sealing sound joints vs. replacing failed sections first), and whether source removal of ash and debris is needed before mastic application. Every Bostonia estimate includes a camera inspection so you see what we see. Call (361) 326-5060 for your free written estimate.
We Also Serve Cities Near Bostonia
Our crews work throughout San Diego County and beyond, with scheduled service available in Bostonia and surrounding metro areas including Los Angeles, San Diego, San Jose, and San Francisco. Dispatch and scheduling are coordinated from our San Diego office, with local crews serving each market.
Serving Bostonia, CA - Our Local Coverage Area
We’re based in the Bostonia 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 Bostonia
Most Bostonia homes in the foothills need inspection within 2 – 4 weeks after a significant Santa Ana wind event, especially if you notice a gritty film on supply registers or an uptick in dusting. The ash and fine debris settle in the first few feet of trunk lines and will recirculate until removed and the intake joints are sealed. Call (361) 326-5060 and we’ll schedule a camera inspection to see if source removal and sealing are needed.
Yes, if the metal is structurally sound and the leaks are at joints and seams. We camera-inspect first; pinholed metal or severely corroded sections need replacement, but many Bostonia galvanized trunks just need proper mastic and mechanical fastening at the joints. We write down exactly which sections can be sealed and which need replacement before any work starts.
Duct sealing stops the problem from recurring by closing the leak paths that pull in unfiltered outdoor air, but it doesn’t remove ash already deposited on trunk-line walls. We typically recommend source removal with a Rotobrush or negative-air method first, then sealing the joints that allowed the intrusion. Sealing alone leaves the contaminant in place.
Bostonia manufactured homes use flexible duct in a ventilated under-belly cavity, exposed to ground moisture, temperature swings, and rodent access through skirting gaps. Site-built homes have rigid metal or insulated flex in attics and walls. Under-belly systems need rodent exclusion, protective wrap, and reinforced mastic, not the same sealing approach as an attic trunk line.
We recommend MERV 11 – 13 for most Bostonia homes after duct sealing, which captures the fine ash and foothill dust without overloading older blower motors. Many 1970s – 80s systems in Bostonia were originally fitted with 1-inch frames that can’t handle higher ratings; we can upgrade to a 4 – 5 inch media cabinet from Aprilaire or Honeywell that fits the existing return plenum. Call (361) 326-5060 and we’ll check your system’s capacity during the sealing estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Bostonia since 2004 as part of the Garrison Partners family.