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 Union Park
We’re the crew Hollis Air Duct Cleaning sends when a Union Park homeowner calls about hot rooms, dusty air, or an AC that never stops running. Our Duct Sealing in Union Park runs on The Garrison Standard: we arrive inside the window, price the job in writing before we touch anything, and leave the site clean. Dispatch and scheduling for Union Park homes are coordinated from our Miami office, but the technicians who show up at your door know this area, from the ranch homes off Alafaya Trail to the properties with long unpaved drives near Rouse Road. If your ducts are leaking conditioned air into a 140°F attic, you’re paying to cool space that doesn’t need it. Call us at (361) 326-5060 and we’ll get you a written estimate.
Why Hollis Air Duct Cleaning Is Union Park’s Preferred Duct Sealing Company
We’ve been doing this since 2004, and our Duct Sealing team has worked enough Union Park homes to know the local failure patterns by heart. The 1970s ranches near East Colonial Drive with original flex duct. The newer builds off Curry Ford Road where builder-grade foil tape gave out after two summers. The rural properties where sandy grit from unpaved stretches migrates straight into the return boot.
Roy Castellanos built Hollis on the idea that a homeowner should know who’s walking in, what it’ll cost, and what happens if something goes wrong. Every technician is background-checked and uniformed. Every job gets a written price before work starts. And every repair is covered by our 365-Day Done Right Promise: if it fails within a year, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues.
HVAC Duct Sealing in Union Park
HVAC Duct Sealing in Union Park means closing the gaps, cracks, and failed connections that let conditioned air escape before it reaches your rooms. In this market, the job is less about minor leaks and more about seals that have been cooked by attic heat or abraded by sandy grit pulled in from unpaved roads. We use mastic and mesh on trunk lines and plenums, replace degraded flex duct with R-8 insulated runs, and verify the seal with airflow testing before we leave. A typical whole-system duct sealing job in Union Park runs $450 – $850 for a single-story home with accessible attic ductwork, with larger homes or systems requiring extensive flex replacement running $900 – $1,400.
Attic Heat and Seal Degradation
Union Park attic temperatures regularly exceed 140°F from May through September. Standard foil tape and lower-grade mastic dry out and crack in that environment within two to three seasons. We spec high-temp mastic and mechanical fasteners on every attic run, because a seal that holds in Orlando’s cooler months still has to survive July.
Return-Side Grit Intrusion
Sandy soil and unpaved stretches off Alafaya and Rouse Road load the return side with fine grit that gets pulled straight into the air handler. That grit abrades sealant at the plenum and return boot, reopening gaps that were tight when installed. We inspect and reseal the return path as standard practice on every Union Park job.
Duct Repair in Union Park
Duct Repair in Union Park addresses the physical damage that sealing alone won’t fix: collapsed flex duct inner liners, disconnected trunk runs, rusted metal plenums, and rodent damage in crawl spaces or attics. We see a lot of 1980s flex duct that’s reached end of life, shedding fibers into the airstream as the inner liner deteriorates. Repair work typically runs $200 – $500 for localized flex replacement or plenum patching, with full duct replacement on a single-story home ranging $1,200 – $2,800 depending on linear footage and access. Every repair gets the same written price and 365-Day Done Right Promise as our sealing work.
Collapsed Flex Duct Replacement
The field vignette we never forget: a 1972 ranch off Rouse Road where the homeowner swore the AC smelled like hot attic. Camera inspection showed the flex duct inner liner had collapsed and was shedding fibers at the plenum, and the return was packed with sandy grit and pollen from an unpaved stretch of the driveway. We sealed the plenum and trunk runs with mastic and mesh, reconnected the damaged flex with new R-8 duct, and verified airflow with a MERV 8 filter. The smell and the dust streaks on the register grilles were gone on the follow-up.
Outbuilding and Detached-Garage Runs
Rural Union Park properties often have duct runs to detached garages, workshops, or guest cottages that were added after the main house system was installed. These lines get overlooked during maintenance and are frequently unsealed or poorly insulated, pulling hot, humid outside air into the main house system. We check and seal them as part of our standard survey.
Trusted Brands We Service in Union Park
We carry parts and materials from Honeywell, Aprilaire, and Abatement Technologies on our Union Park trucks, which means most jobs don’t wait on a parts run. Honeywell media filters and Aprilaire whole-home filtration integrate directly with sealed duct systems to maintain the pressure balance we verify after sealing. Abatement Technologies HEPA filtration and containment products come into play when we’re dealing with microbial growth in ductwork that’s been leaking humid attic air for years. We also stock Nikro negative-air equipment for jobs where containment and extraction matter. For Union Park homeowners, that local parts inventory translates to one visit instead of two, and a system that’s tested and balanced before we leave. Ask about our Union Park Dryer Vent Cleaning while we’re on-site.
Common Duct Sealing Problems We See in Union Park Homes
- Mastic failure in extreme attic heat. Seals that hold up fine in cooler Florida markets dry and crack in Union Park’s 140°F+ attics within two or three seasons. We see this most often on original 1980s-90s installations where standard-grade mastic was used.
- Sandy grit abrasion at return boots. Fine grit from unpaved roads and open land around Union Park migrates past leaky return boots and literally sands away sealant at the plenum connection, reopening gaps that were tight at install.
- Detached-garage duct runs pulling unconditioned air. Outbuilding duct runs on rural Union Park properties are frequently overlooked during sealing, so leaks there keep introducing hot, humid outside air that the main system has to fight.
- Collapsed flex duct inner liners. The combination of decades of heat cycling and Union Park’s high attic temperatures causes the inner liner of older flex duct to delaminate and shed fibers into the airstream, a failure mode that’s rare in cooler climates.
Pricing for Duct Sealing in Union Park, FL
A typical whole-system duct sealing in Union Park runs $450 – $850 for a single-story home with standard attic access and accessible trunk lines. Homes requiring extensive flex duct replacement due to collapsed inner liners or rodent damage range $900 – $1,400. Duct repair for localized issues like plenum patching or single flex runs runs $200 – $500, with full duct replacement on larger homes reaching $1,200 – $2,800. What moves the number: linear footage of ductwork, accessibility (crawl space vs. walk-in attic), extent of existing damage, and whether outbuilding runs need attention. We give you one flat price per system, agreed in writing before work starts. No per-vent pricing, no add-ons at the door. Call (361) 326-5060 for a free estimate, exact to your home.
We Also Serve Cities Near Union Park
Hollis Air Duct Cleaning dispatches crews throughout Central and South Florida. We regularly handle duct sealing and repair in Union Park as well as Jacksonville, Miami, Tampa, and Orlando. Each location operates under The Garrison Standard with independently owned teams, written pricing, and the same 365-Day Done Right Promise.
Serving Union Park, FL - Our Local Coverage Area
We’re based in the Union Park 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 Union Park
Every three to five years for homes on or near unpaved stretches, compared to five to seven years in paved, urban environments. The grit loading here accelerates seal wear at return boots and plenums. Call (361) 326-5060 and we’ll inspect your current seal condition at no charge.
Because cleaning doesn’t fix the leaks that let humid attic air back in. If your ducts are still pulling 140°F, moisture-laden air through gaps in the plenum or trunk lines, microbial growth returns within weeks of cleaning. Sealing stops the moisture source. We verify with a post-seal pressure test.
It makes more sense here than almost anywhere else. Unsealed ducts in 140°F attics lose 20 – 30% of conditioned air to spaces that don’t need cooling. Sealing with high-temp mastic and proper insulation keeps that air in the ducts where it belongs. The payback period in Union Park’s cooling-dominated climate is typically under two years.
Yes, and it’s frequently the biggest hidden leak in rural Union Park properties. Detached-garage runs are often uninsulated, unsealed, or disconnected at the trunk, pulling hot, humid air directly into your main return. We survey and seal outbuilding runs as standard practice on our Union Park jobs.
We test before-and-after static pressure and airflow at the supply registers, and we show you the numbers. You should also feel more even temperatures room-to-room, less dust accumulation on grilles, and a shorter AC runtime within the first billing cycle. If not, our 365-Day Done Right Promise covers a free return visit to make it right.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Union Park and Central Florida since 2004.