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 Three Lakes
Duct sealing in Three Lakes, FL typically costs $450 – $1,200 for a whole-home system, with post-storm assessments running $180 – $340 when moisture intrusion is suspected. We’re Hollis Air Duct Cleaning, and our crews work Three Lakes regularly, from the Bonita Lakes subdivisions to the corridors near SW 152nd Street and the older pockets off SW 117th Avenue. Our Miami office dispatches teams to Three Lakes with the same scheduling discipline we apply everywhere: arrive inside the quoted window, price in writing before touching anything, and leave the site clean. If your registers are blowing musty air after yesterday’s thunderstorm, or your July power bill has jumped thirty percent, call us at (361) 326-5060. We’ll send a background-checked, uniformed technician who knows how Three Lakes humidity attacks ductwork differently than anywhere else in South Florida.
Why Hollis Air Duct Cleaning Is Three Lakes’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Duct Sealing in Three Lakes reputation was built on showing up when we said we would. Three Lakes homeowners aren’t looking for the cheapest bid; they’re looking for the bid that doesn’t change at the door. That’s why we write every price down before work starts, and it’s why our 365-Day Done Right Promise covers every sealing job in writing. If the seal fails or moisture returns within a year, we come back at no charge, including a free second visit.
Our technicians are background-checked, uniformed, and trained on The Garrison Code: arrive inside the window, price in writing, complete the job by the book, leave the site clean. They carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and they understand that Three Lakes’s 1980s and 1990s flex duct systems fail differently than sheet metal in drier climates. When you call (361) 326-5060, a live person answers, 24 hours a day, seven days a week. No voicemail loops. No callback queues.
Duct Insulation in Three Lakes
Duct Insulation in Three Lakes is often the first line of defense against the condensation that destroys flex duct from the inside out. The job involves wrapping or replacing the fiberglass or foil-backed insulation around your supply and return runs, sealing the vapor barrier at every joint, and verifying that the R-value matches what your attic temperature demands. In Three Lakes, where attic temperatures can reach 140°F in August and humidity stays above 70 percent for months, compromised insulation is not a comfort issue. It’s a mold issue. Typical Duct Insulation in Three Lakes runs $380 – $890 for a whole-home system, depending on linear footage and whether we’re working around existing trusses in tight attic spaces.
When Insulation Becomes a Moisture Trap
We see this constantly in Three Lakes homes built between 1985 and 1998: the outer vapor barrier tears on a truss nail, humid attic air reaches the fiberglass core, and the insulation becomes a sponge that never dries. The HVAC blows harder to compensate, energy bills climb, and the homeowner smells mildew at the registers. We strip the damaged runs, install new foil-faced insulation with sealed seams, and verify with a moisture meter before we close the attic hatch.
R-Value Matching for Tropical Attics
Three Lakes attics need R-6 to R-8 on flex duct, not the R-4 that contractors sometimes install to save material. We specify the correct R-value in writing, install it, and photograph the work for your records. The price does not move after we quote it.
HVAC Duct Sealing in Three Lakes
HVAC Duct Sealing in Three Lakes means closing the gaps where conditioned air escapes into your attic and unconditioned air leaks back into your system. The job involves mastic and mesh at plenum joints, mechanical sealing at register boots, and negative-pressure testing to verify the seal holds. In Three Lakes, where afternoon thunderstorms can drive water through soffit vents and roof penetrations, HVAC Duct Sealing is often performed alongside moisture assessment and camera inspection. Typical HVAC Duct Sealing in Three Lakes runs $450 – $1,200 for a full system, with partial sealing of problem zones starting around $280.
Post-Storm Sealing Protocol
We don’t seal over wet duct. After water intrusion, our tech pulls the affected runs, checks the interior liner with a borescope camera, and takes moisture readings at three points. If the flex is dry and the structural layer intact, we seal the plenum and boots with mastic and mesh, then pressure-test the system. If it’s wet, we document everything and recommend replacement. Sealing damp flex traps mold spores inside. They’ll be back at your registers within three weeks.
Register Boot Sealing on Older Flex Systems
Three Lakes homes from the 1980s and 1990s often have register boots that were taped, not mastic-sealed, during original construction. Tape dries and fails in attic heat. We remove the old tape, clean the joint with a vacuum-connected brush, apply mastic with embedded mesh, and let it cure before restoring airflow. The seal lasts.
Trusted Brands We Service in Three Lakes
We stock parts and materials from Aprilaire, Abatement Technologies, and Guardsman for Three Lakes jobs, which means we’re not waiting on a Miami warehouse run to complete your sealing work. Our trucks carry Rotobrush rotary brush systems for pre-seal cleaning, Nikro negative-air machines for source removal, and filtration products from Honeywell and Aprilaire for homeowners who want to upgrade while we’re in the attic. When a Bonita Lakes customer needed a Guardsman antimicrobial treatment applied after a post-storm replacement last August, we had the material on the van and completed the job same visit. Fast turnaround matters in Three Lakes humidity. Every day a compromised duct stays open is another day mold has the conditions it needs.
Common Duct Sealing Problems We See in Three Lakes Homes
- Sealing over damp flex after storms. Some crews will tape or aerosol-seal wet duct to get the job done fast. In Three Lakes, where afternoon thunderstorms are a near-daily summer occurrence, this traps moisture and mold spores inside the system. The “sealed” duct becomes a biological growth incubator, and the smell returns at the registers within weeks.
- Failed tape joints on 1980s-1990s flex systems. Original construction in Three Lakes neighborhoods like Bonita Lakes relied on duct tape at register boots and plenum connections. After thirty-plus years in 140°F attics, that tape is dust. We remove it entirely and replace with mastic and mesh, but only after negative-pressure source removal clears the debris and moisture behind it.
- Hidden condensate at the air handler plenum. Water intrusion in Three Lakes often tracks down soffit vents and pools at the plenum, not the trunk line. Skipping camera inspection here means missing standing water that will push moisture back through your supply and return ducts as soon as the blower cycles on. We inspect the plenum on every post-storm call.
- Blower motor mismatches pushing moisture. A blower set too high for the duct capacity creates negative pressure that pulls humid attic air through every imperfect seal. In Three Lakes’s tropical climate, that’s a recipe for condensation inside the duct. We check static pressure and MERV rating compatibility before we seal, because a sealed system with the wrong airflow is just a more efficient mold machine.
Pricing for Duct Sealing in Three Lakes, FL
Whole-home duct sealing in Three Lakes typically runs $450 – $1,200. Partial sealing of problem zones, such as a leaking plenum or failed register boots, starts around $280 and usually tops out at $580. Post-storm moisture assessment with camera inspection and documentation runs $180 – $340. Duct insulation replacement, when needed alongside sealing, adds $380 – $890 depending on linear footage.
What moves the price: accessibility of attic runs, whether we’re working around stored items near SW 117th Avenue homes with limited hatch access, the extent of moisture damage, and whether negative-pressure source removal is required before sealing can begin. We do not quote per-vent pricing. We do not offer teaser coupons that balloon once the van is in your driveway. We inspect, we write the price down, and that number does not change after you approve it. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Three Lakes
Our Duct Sealing crews serve homeowners throughout South and Central Florida, including Three Lakes and surrounding communities. We regularly dispatch to Jacksonville, Miami, Tampa, and Orlando from our Miami office, with local scheduling that respects your time window. Whether you’re in a Three Lakes subdivision off SW 152nd Street or a property closer to the Dade-Broward line, the same Garrison Standard applies: written price, written guarantee, background-checked technician, site left clean.
Serving Three Lakes, FL - Our Local Coverage Area
We’re based in the Three Lakes 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 Three Lakes
If the interior duct liner is wet to the touch or shows visible mold, replacement is necessary; sealing or cleaning alone traps moisture and spores inside. We verify with borescope camera inspection and moisture readings at multiple points, then document our findings with photos and written readings so you have evidence for your insurer. Call (361) 326-5060 and we’ll schedule a post-storm assessment, usually within 24 – 48 hours of your call.
Original construction in these homes used tape at register boots and plenum joints, which degrades to powder after decades in 140°F attics, and flex duct insulation that tears on truss nails and traps humidity. We remove all failed tape, clean joints with vacuum-connected brushes, and seal with mastic and mesh after verifying the duct interior is dry and intact. Without this full protocol, any new seal fails at the first humid season.
We inspect the plenum, air handler, and accessible runs with a camera; take moisture readings; photograph conditions; and test static pressure. Dry, intact flex gets sealed at boots and plenum with mastic and mesh. Wet or mold-compromised flex gets documented for insurance and replaced, with sealing performed only on the dry remainder. Every step is photographed and written up for your records.
Sealing helps only if the duct is dry and structurally sound; sealing wet or moldy duct makes the problem worse by trapping spores in a dark, humid environment. In Three Lakes, where mold can establish within 48 – 72 hours after water intrusion, we always verify dryness first. When the duct is clean and dry, a proper seal prevents humid attic air from entering and condensing inside the system.
We provide dated photos, moisture meter readings with specific percentages, borescope video of the interior liner condition, and a written scope of work with line-item pricing. After a July storm in Bonita Lakes, our documentation of saturated flex and mold growth on a 1991 home’s interior liner helped the homeowner secure full replacement approval from their insurer, not just a cleaning-only scope. Call (361) 326-5060 and we’ll explain exactly what documentation your carrier typically requires.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Three Lakes since 2004 as part of the Garrison Partners family.