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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across Mango
Duct sealing in Mango typically costs between $850 and $2,400 for a whole-home system, depending on how much of the original flex duct needs attention and whether storm damage has soaked the insulation. We’re the Duct Sealing in Mango crew that local homeowners call when their 1990s-era system starts blowing musty air or the electric bill climbs every summer without explanation. Our technicians dispatch from the Miami office and carry mastic sealant, metal-backed tape, and replacement flex duct sized for the concrete-block and frame homes that dominate this area. If you’re off Mango Road, near the Seffner line, or in one of the subdivisions built during the 1980s – 2000s boom, we know what your attic probably looks like before we open the hatch. Call (361) 326-5060 for a free estimate with a written price before any work starts.
Why Hollis Air Duct Cleaning Is Mango’s Preferred Duct Sealing Company
We’ve been working in Hillsborough County since 2004, and Mango’s mix of older rural properties and mid-century subdivisions is familiar territory. Our Duct Sealing team has crawled through enough attics here to know the difference between a simple collar leak and a system that’s been compromised by years of sideways rain through soffit vents.
The Garrison Standard governs every job: arrive inside the quoted window, price in writing before touching equipment, complete the work by the book, and leave the site clean. Our technicians are background-checked and uniformed, so you know who’s walking into your home. Phones are answered by a live person 24 hours a day, 7 days a week, not a callback queue that dumps you to voicemail.
Every repair we make carries the 365-Day Done Right Promise in writing. If the seal fails, the musty smell returns, or a connection separates within a year, we come back and make it right at no charge, including a free second visit. That’s not a verbal assurance. It’s on the invoice.
Duct Sealing Services in Mango
Duct Sealing Services in Mango address the leaks, gaps, and separated connections that develop in flex duct and metal trunk lines after 15 – 20 years of constant HVAC use. A typical whole-home sealing job in Mango runs $850 – $1,800 for standard flex duct repairs and collar resealing, while systems with extensive storm damage, crushed runs, or multiple disconnected sections can reach $2,000 – $2,400. We use mastic sealant and metal-backed tape at every joint, not hardware-store duct tape that dries and fails within a season.
Leak Detection and Static Pressure Testing
We pressurize the system and measure supply and return static before touching anything. That number tells us whether you’re losing conditioned air into the attic or drawing hot, humid attic air back into the system. In Mango, we regularly see static pressure readings double what the manufacturer specifies, which means the blower is working harder and your electric bill is climbing for air you never feel.
Collar Reconnection and Mastic Sealing
The connection between flex duct and the air handler or supply plenum is where most leaks start. We disconnect each collar, clean the mating surface, apply mastic sealant, reconnect with a mechanical seal, and reinforce with metal-backed tape. For homes near the rural fringe where pollen and prescribed-burn smoke load up the returns, a tight collar seal also keeps those particulates from bypassing your filter.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Duct Insulation in Mango
Duct Insulation in Mango is often the companion job to sealing, because flex duct insulation that has been soaked by sideways rain through soffit vents will hold moisture against the duct wall and feed microbial growth even after the leak is sealed. Replacing wet insulation with new R-6 or R-8 flex duct runs typically adds $400 – $900 to a sealing job, depending on linear footage and attic accessibility. We don’t seal over wet insulation. That’s a rule.
Moisture-Damaged Insulation Replacement
After a July storm off Mango Road, a homeowner called about musty air and our tech found the original 1990s flex duct in the attic sagging under soaked insulation, with a crushed run feeding the rear bedroom and a disconnected collar at the air handler. We ran a camera inspection, pulled the wet flex with negative pressure and HEPA filtration, reconnected and sealed the supply and return ducts at every collar, then wrapped the runs with new duct insulation. Supply static pressure dropped, the musty smell cleared within days, and the system stopped short-cycling.
Attic Heat Gain Reduction
Bare galvanized trunk lines in unconditioned attics, still found in some older homes near the Mango-Seffner line, lose up to 30% of their cooling capacity to radiant heat before the air reaches your vents. Wrapping those trunks with fiberglass insulation jacket and sealing every joint with mastic can recover that loss and even out temperatures room to room.
Trusted Brands We Service in Mango
We stock parts and materials from Aprilaire, Abatement Technologies, and Guardsman for Mango jobs, which means most sealing and insulation work is completed in a single visit without waiting on a parts run to Tampa. Our equipment roster includes Rotobrush rotary brush systems for pre-sealing cleaning and Nikro negative-air machines with HEPA filtration for jobs where mold or moisture is present. When we specify Aprilaire media filters or Guardsman UV accessories after a sealing job, it’s because your duct system is finally tight enough for those upgrades to matter.
Common Duct Sealing Problems We See in Mango Homes
- Original flex duct dries out and leaks at connections after 15 – 20 years. Mango’s year-round HVAC use accelerates that breakdown, and we find collar separations and cracked flex in nearly every 1990s home we inspect. The leak is often hidden above the insulation jacket, so the homeowner only notices the symptom: a room that won’t cool or a blower that runs constantly.
- Sideways rain through attic soffit vents soaks flex duct insulation. May through September, Mango’s afternoon sea-breeze thunderstorms drive water where it doesn’t belong. Sealing over wet insulation traps moisture and feeds microbial growth, so our post-storm calls here routinely turn into moisture-remediation-and-sealing jobs rather than simple cleanings.
- Crushed or disconnected runs from prior attic work go undetected. A homeowner or handyman steps on a flex duct during a water-heater swap or pest treatment, pushes it back into place at the register end, and the actual break deeper in the run gets missed. We camera every suspicious run before we seal.
- Bare galvanized trunk lines in older rural homes corrode at seams. Near the Mango-Seffner line, some properties still have original metal duct that has never been sealed. Mastic alone won’t hold on rusted metal, so we assess whether sealing is viable or whether section replacement makes more sense.
Pricing for Duct Sealing in Mango, FL
Most whole-home duct sealing jobs in Mango fall between $850 and $2,400. At the lower end, you’re looking at a single-story concrete-block home with accessible attic space, standard flex duct in fair condition, and 8 – 12 supply runs that need collar resealing and mastic reinforcement. At the upper end, you’re dealing with storm-soaked insulation requiring replacement, multiple crushed or disconnected runs, or bare galvanized trunk lines that need section replacement before sealing is possible.
What moves the price: attic accessibility (tight truss spacing adds labor), linear footage of duct, whether insulation is salvageable or must be replaced, and how many connections have separated. We inspect first, write the price down, and get your approval before any work begins. No per-vent pricing, no teaser coupon that balloons once the van is in your driveway. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Mango
Our crews work throughout eastern Hillsborough County, including Brandon, Valrico, Thonotosassa, and Gibsonton. Scheduling and dispatch are coordinated from our Miami office, but the technicians who arrive at your door live and work in this area. They know the difference between a Mango attic and a Brandon attic, and they bring the right materials for the housing stock they’re facing.
Serving Mango, FL - Our Local Coverage Area
We’re based in the Mango 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 Mango
Yes. If a May – September thunderstorm has driven rain through your soffit vents and soaked the flex duct insulation, sealing alone will trap moisture and feed mold growth. We inspect for saturation first, replace wet insulation if needed, then seal. Call (361) 326-5060 and we’ll determine which approach your system needs.
Signs include a room that never reaches temperature, a blower that runs longer than it used to, dust accumulation around ceiling registers, or a musty smell when the system starts. We measure static pressure and run a camera to confirm before recommending sealing. The inspection is free.
Sometimes. If the metal is sound and seams are accessible, we clean and mastic-seal them, then wrap with insulation jacket. If corrosion has perforated the metal or seams are too degraded, section replacement is the better long-term fix. We assess this during inspection and price both options in writing.
Cleaning removes debris from inside the duct. Sealing closes the gaps that let conditioned air escape into the attic and allow hot, humid attic air to enter the system. A clean duct with a 20% leak is still wasting energy and struggling to cool your home. Sealing addresses the efficiency and comfort problem directly.
Yes, on any job where we’re disturbing old flex duct, moisture-damaged insulation, or visible microbial growth. Our Nikro negative-air machines with HEPA filtration capture particulates at 99.97% efficiency before they enter your living space. We also contain the work area and run continuous extraction during the sealing process.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Mango since 2004.