Fast, Reliable Duct Repair & Sealing Across Longwood
Duct repair and sealing in Longwood typically runs $180-$650 depending on whether we’re patching a single flex run or resealing an entire metal trunk system, and most jobs are completed in a single visit. If your upstairs rooms won’t cool evenly or your energy bills have climbed without explanation, damaged ductwork in your attic is the likely cause. Call us at (844) 685-6342 for a free estimate with upfront pricing before any work begins.
We’ve been driving to Longwood since 1984, back when SR 434 was two lanes and most of these homes were new. Our technicians know the difference between a 1978 slab-on-grade off US 17-92 and a 1990s build near Wekiva Springs, and we know what those decades of Florida heat have done to the ductwork overhead. We’ll be there when we say.
Why Bellows Air Duct & Vent Co. Is Longwood’s Preferred Duct Repair & Sealing Company
Forty-two years in this trade means we’ve worked on Longwood homes through three building cycles. The original 1970s tract houses near Longwood Hills, the 1980s expansion toward the Wekiva River, and the 1990s infill along Markham Woods Road. Each era used different duct materials, and each has aged differently in Longwood’s particular climate.
Our Duct Repair & Sealing team carries a 90-Day Done Right Promise on every job, stamped in writing with no paperwork required if something needs attention. Calls are answered by a live person 24 hours a day, not a voicemail tree. Our technicians are background-checked, uniformed, and equipped with camera inspection gear from Rotobrush and Nikro so you see the before and after, not just take our word for it.
We’re not the cheapest outfit advertising a coupon in the Seminole County shopper. We’re the company you call when the cheap fix failed and you want it done right and never thought about again.
Our Duct Repair & Sealing Services in Longwood
Mastic Sealant for Metal Ductwork
Metal trunk lines in Longwood attics face a brutal environment. When attic temperatures exceed 140°F for months on end, standard duct tape adhesive degrades within a single cooling season. We seal metal joints and seams with professional-grade mastic compound rated for continuous high-temperature exposure, then reinforce with fiberglass mesh where pressure demands it. In Longwood’s 32750 and 32779 ZIP codes, where decades of heat cycling have opened seams you can’t see from below, this is often the difference between conditioned air reaching your rooms and bleeding into the attic.
Flex Duct Repair and Replacement
Flex duct was the standard for Longwood’s 1980s and 1990s construction boom, and it’s failing now in predictable patterns. Attic heat hardens the inner liner until it cracks. The wire helix corrodes. Sections sag between supports, kink at turns, or collapse entirely where storage boxes or technician foot traffic compressed them. We replace damaged flex with new R-8 insulated duct, properly supported at maximum 4-foot intervals, with sealed collars at every metal connection. Most flex repairs in Longwood run $220-$380 per run.
Duct Insulation Upgrades
Unconditioned attics in Longwood are among the hottest in Seminole County. R-4 or uninsulated flex from the 1970s and 1980s loses significant cooling before air ever reaches your grille. We wrap repaired or replaced duct with R-8 insulation minimum, and R-10 where space allows, using foil-faced products that reflect radiant attic heat. For homeowners in the Wekiva basin areas of 32779, where humidity compounds the thermal load, proper insulation also reduces condensation on cold duct surfaces that feeds mold growth.
Air Leak Detection and Sealing
We pressurize your duct system and use smoke pencils and thermal imaging to locate leaks the eye misses. In Longwood’s older homes, we regularly find disconnected boots at ceiling grilles, failed flex-to-metal connections, and seams that opened as the house settled on its slab foundation. Each leak is sealed appropriately, mastic for metal, mechanical collars and tape for flex, with camera verification before we leave.
What happens when you call
- 1
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.
Trusted Brands We Service in Longwood
Our trucks carry parts and materials from Nikro, Honeywell, and Aprilaire, the same brands serious HVAC contractors specify for their own installations. We don’t make a trip to Longwood without the mastic, insulation, and collar sizes we’re likely to need, because driving back to the warehouse costs you time and costs us a second visit we don’t want to make. Most repairs are completed in a single visit. If your system uses specialized components, we’ll tell you upfront whether we stock them or need to order, and what that means for timeline.
Common Duct Repair & Sealing Problems We See in Longwood Homes
- Delaminated fiberglass liner in 32779. In Longwood’s Wekiva-basin ZIP 32779, prolonged attic heat over 140°F and high humidity cause fiberglass duct liner to delaminate within 7-10 years, a failure mode rarely seen in drier metro suburbs like Casselberry or Winter Springs. Once the liner separates from the metal shell, it sheds particles into your air and provides a porous surface for mold colonization.
- Collapsed flex duct from attic traffic. With no basements in Florida slab construction, HVAC technicians, cable installers, and homeowners themselves walk attic joists to access equipment. Every footfall risks compressing flex duct. In the Springs Landing neighborhood off Markham Woods Road, we replaced 50 feet of collapsed flex duct where attic foot traffic and 140°F temps had kinked the trunk line, creating a near-total airflow blockade. After sealing the remaining metal branches with mastic and insulating the new flex with R-8 wrap, the homeowner’s upstairs rooms finally cooled evenly during a summer peak.
- Mold-colonized liner recontaminating sealed joints. Even properly sealed ductwork will re-contaminate supply air if the interior liner is already hosting mold. We camera-inspect every system before sealing, and we’ll show you what we see. When liner replacement is necessary before sealing makes sense, we’ll say so.
- Failed mastic from improper application. Mastic applied too thin or over dusty surfaces cures poorly and peels within months in a Longwood attic. We clean joints to bare metal, apply mastic to the specified thickness, and allow proper cure time even when it means a longer service call.
Pricing for Duct Repair & Sealing in Longwood, FL
We disclose every price before lifting a tool. No bait coupons, no changes at the door.
| Service | Typical Range in Longwood |
|---|---|
| Single flex duct repair/replacement | $220 - $380 |
| Metal trunk sealing with mastic (per section) | $180 - $340 |
| Duct insulation upgrade (per run) | $160 - $290 |
| Full system leak detection and sealing | $450 - $650 |
| Camera inspection with written report | $89 - $129 |
Costs run toward the higher end in Longwood’s 32779 Wekiva-area homes, where biological fouling and physical deterioration often require combined remediation and repair. Standing offers include $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount. Call (844) 685-6342 for your exact quote.
We Also Serve Cities Near Longwood
Our service area covers all of Seminole County and into northern Orange. We regularly run Duct Repair & Sealing in Longwood and neighboring Lake Mary, Casselberry, Winter Springs, and Altamonte Springs. Same upfront pricing, same 90-Day Done Right Promise, same live person answering the phone no matter which city you’re calling from.
Serving Longwood, FL - Our Local Coverage Area
We’re based in the Longwood 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 - Duct Repair & Sealing in Longwood
Longwood’s combination of 140°F attic heat and Wekiva-basin humidity degrades duct materials faster than in drier, less vegetated suburbs. The biological load from wetland mold spores and pollen fouls liners while thermal cycling cracks and sags flex duct. Casselberry and Winter Springs, just a few miles east, see meaningfully slower deterioration. Call (844) 685-6342 for a camera inspection to assess your system’s condition.
Sealing over mold-colonized liner traps spores and guarantees re-contamination of supply air. We replace deteriorated liner first, then seal. Our camera inspection shows you the extent before we recommend either approach. The $89 Seasonal Tune-Up includes a basic visual assessment if you’re unsure where you stand.
Crushed flex duct is replaced, not repaired. We remove the damaged section, install new R-8 insulated flex with proper support spacing, and seal collars with mechanical connections rated for attic temperature extremes. In Longwood’s older homes with original 1980s flex, we often find multiple compromised sections during a single inspection.
Professional-grade mastic compound, applied to cleaned bare metal at specified thickness, outperforms all tapes in continuous 140°F exposure. We reinforce with fiberglass mesh at high-pressure joints. This is standard on every metal trunk repair we perform in Longwood.
Most repair and sealing work on existing residential ductwork does not require a Seminole County permit. Replacement of substantial duct runs or modifications to the HVAC distribution design may. We handle permit determination as part of our upfront assessment and include any required fees in your disclosed price. No surprises on the bill.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Longwood since 1984.