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 Dunedin
Duct sealing in Dunedin typically runs $450 – $950 for a whole-home system, and most jobs are completed in a single visit. If you’re losing cooled air through gaps in your attic ductwork or smelling musty air from your vents, sealing the joints and seams is the fix that actually lasts. Call Hollis Air Duct Cleaning at (361) 326-5060 for a written estimate before any work starts.
We’ve worked in Dunedin long enough to know the local housing stock isn’t like the rest of Pinellas County. The historic bungalows along Edgewater Drive, the pier-foundation cottages near the marina, and the 1970s ranch homes off Main Street each present their own duct sealing challenges. Our crews carry equipment up ladders and into tight attic spaces that newer subdivisions simply don’t have. Dispatch and scheduling are coordinated from our Miami office, but the technicians who arrive at your Dunedin door know this market.
Why Hollis Air Duct Cleaning Is Dunedin’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. That track record predates most duct cleaning outfits in Pinellas County, and it matters when you’re inviting a crew into a historic Dunedin home with original 1940s ductwork. We don’t send day laborers. Every technician is background-checked, uniformed, and expected to operate under The Garrison Code: arrive inside the quoted window, price the job in writing before touching anything, complete the work by the book, and leave the site clean.
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 when your AC is blowing 85-degree air through a leaking attic trunk line. The 365-Day Done Right Promise covers every duct sealing job in writing: if the work fails within a year, we return and make it right at no charge, including a free second visit.
We serve Dunedin homeowners who’ve already been burned by the bait-and-switch routine. The low coupon price that balloons once the van is in the driveway. Hollis doesn’t operate that way. The price is written down before any work starts, and it does not move at the door.
Duct Sealing Services in Dunedin
Duct Sealing Services in Dunedin address the gaps, seams, and disconnected joints that leak conditioned air into your attic or crawlspace instead of delivering it to your rooms. In a climate where air conditioners run nearly year-round, every cubic foot of cooled air that escapes is money you’re paying FPL to waste. A typical whole-home duct sealing job in Dunedin runs $450 – $950 depending on system size, accessibility, and whether we need to remove deteriorated insulation before sealing.
Most Dunedin homes built before 1960 have rigid metal trunk lines with hand-formed joints, not the snap-together flex duct common in 1990s construction. Those older joints were sealed with fabric tape or early mastic that cracks after decades of heat cycling. Our crews use modern duct sealing mastic reinforced with mesh tape, applied to clean metal surfaces so the bond actually holds against Dunedin’s humidity and salt air.
Attic Duct Sealing and Repair
Attic ductwork in Dunedin’s historic bungalows often sits in uninsulated spaces where summer temperatures exceed 130°F. Heat expands the metal; joints open slightly; cooled air escapes. We seal every accessible joint with mastic and test with a duct blaster or smoke pencil to verify the repair. In homes near Honeymoon Island or Caladesi, we also inspect for salt-air corrosion that can pit metal surfaces and compromise the seal.
Crawlspace and Pier-Foundation Sealing
Homes on pilings near the marina or downtown have duct runs suspended between floor joists, exposed to humid outdoor air from below. Sealing these ducts requires working in confined spaces, sometimes carrying equipment up stairs or ladders to reach the entry point. We seal the joints, then assess whether additional insulation is needed to prevent condensation on the cool metal surfaces.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Duct Insulation in Dunedin
Duct Insulation in Dunedin is often the companion service to sealing, because sealing a duct without addressing failed insulation is only half the job. In Dunedin’s humid subtropical climate, cool air moving through uninsulated metal ducts causes condensation that drips into ceilings, attracts pests, and breeds microbial growth. A typical duct insulation project in Dunedin runs $600 – $1,400 for a whole-home system, depending on linear footage and whether we’re replacing old fiberglass batting or adding new wrap to previously bare metal.
The problem specific to this market: original 1940s Dunedin bungalows often have attic ducts wrapped in old, disintegrating fiberglass batting that gets sucked into the air handler when disturbed. This material is rarely seen in newer Pinellas County homes. Our techs remove the loose, failing insulation before applying new, properly secured wrap. Sealing over old batting traps particles that later shed and clog the air handler, reducing airflow and making your MERV-rated filter less effective.
Insulation Removal and Replacement
We remove deteriorated fiberglass batting using negative-air containment and HEPA filtration, so loose fibers don’t circulate through your living space. New insulation is secured with mechanical fasteners and vapor-barrier tape, not the friction-fit or twine ties that fail after a few seasons of Dunedin humidity.
Condensation Control in Coastal Homes
Salt air near the coast accelerates corrosion on metal duct components, and corroded surfaces don’t hold insulation adhesive well. We inspect for pitting and apply appropriate primers or recommend replacement sections before insulating. This step prevents the insulation from sagging and creating air gaps where condensation forms.
Trusted Brands We Service in Dunedin
Hollis Air Duct Cleaning uses professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies on every Dunedin job. Our rotary brush systems agitate debris from rigid metal duct walls without damaging original 1940s fabrication. Nikro negative-air machines maintain containment during insulation removal in tight attic spaces. For filtration and sealing products, we stock Guardsman mastic compounds and mesh tapes rated for high-humidity applications, with parts available for fast turnaround when a Dunedin homeowner needs a repair completed quickly. We don’t use hardware-store gear that fails after one Florida summer.
Common Duct Sealing Problems We See in Dunedin Homes
- Disintegrating fiberglass batting in historic bungalows. Original 1940s attic ducts on homes along Edgewater Drive or near the marina are often wrapped in fiberglass batting that has turned to loose particles. When the HVAC blower engages, these particles get sucked into the return and distributed through the supply vents, clogging the air handler and reducing system efficiency.
- Salt-air corrosion on metal trunk lines. Homes within a few miles of Honeymoon Island or Caladesi experience accelerated corrosion on galvanized steel ducts. Corroded surfaces won’t hold mastic or tape, so sealing requires surface preparation or section replacement that technicians in inland markets rarely encounter.
- Failed tape adhesive from humidity cycling. Dunedin’s year-round humidity causes duct tape adhesive to soften and slip, while winter dry spells (when snowbirds arrive and thermostats get pushed lower) cause it to crack. The result is seasonal leaking that many homeowners mistake for normal AC performance decline.
- Pest entry through gaps in pier-foundation duct runs. Ducts suspended in crawlspaces under homes on pilings are accessible to rodents, insects, and the occasional snake. Gaps at joints become highways for pests and the debris they carry, compounding the microbial load that fogging ‘sanitisers’ only mask.
Pricing for Duct Sealing in Dunedin, FL
A typical whole-home duct sealing in Dunedin runs $450 – $950. Duct insulation replacement adds $600 – $1,400 depending on linear footage. What moves the price: accessibility (tight 1940s attics versus open crawlspaces), whether we need to remove failed insulation before sealing, the extent of salt-air corrosion requiring surface prep, and system size (single-zone bungalow versus multi-zone ranch).
We do not quote per-vent teaser prices that balloon at the door. Hollis provides one flat price per system, agreed in writing before work starts. Every estimate includes a written scope: which ducts are being sealed, what insulation is being removed or added, and how we’re verifying the result. Before-and-after photos of your own ducts are included, not stock images. Call (361) 326-5060 for an exact quote. Estimates are free.
We Also Serve Cities Near Dunedin
Our crews work throughout northern Pinellas County, including Duct Sealing calls in Pinellas Park, Largo, Seminole, and Clearwater. Each job follows The Garrison Standard: written price, written guarantee, background-checked uniformed technicians, and the 365-Day Done Right Promise.
Serving Dunedin, FL - Our Local Coverage Area
We’re based in the Dunedin 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 Dunedin
Sealing alone won’t fix musty smells if the source is microbial growth on deteriorated insulation or standing condensation in the duct. We remove the failing material first, then seal the joints to prevent new moisture intrusion. In a 1942 bungalow on Edgewater Drive, our team removed crumbling fiberglass batting, sealed the rigid metal trunk line with mastic and mesh, and the homeowner reported the salt-air mustiness was gone within 48 hours. Call (361) 326-5060 if you’re smelling musty air from your vents.
Original 1940s ducts in Dunedin were hand-fabricated with soldered or riveted joints sealed with early fabric tape or thin mastic. Decades of heat cycling, humidity expansion, and salt-air corrosion have degraded those seals. Newer homes use flex duct with factory-sealed connections that don’t experience the same thermal stress. The fix is source removal of failed sealant, surface prep for corroded metal, and application of modern mastic rated for high-humidity environments.
Sealing reduces humidity intrusion by closing gaps where outdoor air enters the duct system. In pier-and-beam homes near the marina or downtown, unsealed joints pull humid outdoor air directly into the airflow, raising indoor relative humidity and forcing your AC to work harder. Sealing the ducts doesn’t dehumidify the crawlspace itself, but it stops the duct system from amplifying the problem. Call (361) 326-5060 for a crawlspace duct assessment.
We don’t seal over old, disintegrating fiberglass batting. The loose particles get trapped under new mastic or tape, then shed later into the air handler, reducing airflow and filter effectiveness. Our process removes the failing insulation using negative-air containment and HEPA filtration, seals the bare metal joints, then applies new insulation if needed. This is standard procedure for Dunedin’s historic housing stock.
Salt air accelerates corrosion on galvanized steel duct components, creating pitted surfaces that won’t hold mastic or tape adhesive. In homes within a few miles of the coast, we inspect for corrosion during our pre-work assessment and may recommend section replacement or specialized primers before sealing. Coastal humidity also causes standard duct tape to fail faster, so we use mastic and mesh rated for marine environments. Call (361) 326-5060 for a coastal-home duct evaluation.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Dunedin since 2004 as part of the Garrison Partners family.