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 Windermere
Windermere’s lakefront humidity and sprawling custom homes create a specific kind of duct problem that inland Orlando crews rarely encounter. We’re the Duct Sealing team that understands how condensation from the Butler Chain of Lakes works its way into unconditioned attic runs, loosening mastic and corroding metal seams across multiple HVAC zones. Our technicians dispatch from the Garrison Partners South Florida office and serve Windermere properties with the same written pricing and 365-Day Done Right Promise we’ve stood behind since 2004. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Windermere’s Preferred Duct Sealing Company
We’ve sealed ducts in the estates along Lake Down and the newer builds off Maguire Road long enough to know which 1990s-era flexible ductwork is failing and where newer spray-foam encapsulation has hidden gaps that standard inspections miss. Roy Castellanos built this operation on The Garrison Standard: arrive inside the window, price in writing, leave the site clean. That discipline matters in Windermere, where homeowners have dealt with too many contractors who treat a 6,000-square-foot home like a tract house and price accordingly after they arrive.
Our phones are answered by a live person 24 hours a day, 7 days a week. No callback queues. No voicemail loops on a Saturday when your AC is cycling constantly because cooled air is dumping into the attic. Our technicians are background-checked and uniformed; you know who’s walking into your home before they arrive. And every repair is covered by our 365-Day Done Right Promise in writing, if the seal fails, we return and make it right at no charge, including a free second visit.
Air Duct Sealing in Windermere
Air Duct Sealing in Windermere addresses the specific failure pattern of large custom homes: multiple zones, extensive attic duct runs, and near-continuous AC operation from April through October that pressurizes every joint and seam until mastic cracks and metal connections loosen. We seal supply and return ducts with duct sealing mastic and professional-grade reinforcement, stopping the conditioned-air loss that forces your system to run longer and harder. In Windermere’s market, a typical whole-home duct sealing job runs $1,800 – $3,500 depending on home size, accessibility, and whether we’re repairing existing seals or replacing degraded flexible ductwork.
Multi-Zone System Sealing
Windermere’s larger homes often run three to five HVAC zones. Each zone adds connection points where seals degrade. We pressure-test every zone independently, identify which runs are leaking, and seal only what needs sealing. No blanket quotes. No unnecessary work.
Attic Run Repair
Unconditioned attics in Windermere reach 140°F in July. That heat cycling hardens mastic and flexes metal seams. We use Abatement Technologies sealing compounds rated for extreme temperature variation, applied after surface prep that older crews often skip.
Duct Sealing Services in Windermere
Duct Sealing Services in Windermere cover more than slapping tape on a visible gap. We perform full-system pressure testing with calibrated equipment, locate leaks in concealed runs, and restore airflow balance so every room receives designed capacity. Homes near Lake Butler and Lake Chase see accelerated corrosion at metal joints from the constant humidity; sealing these properly requires material selection that cheaper operators don’t bother with. For Windermere homeowners, whole-system duct sealing typically falls between $1,800 and $3,500, with partial repairs on single zones starting around $850.
Pressure Diagnostics
Before we touch anything, we measure static pressure and calculate airflow loss. This gives us a baseline and shows you exactly what percentage of your conditioned air is escaping. The number is often higher than homeowners expect in 4,000-square-foot homes with 20-year-old ductwork.
Post-Seal Verification
We test again after sealing. The pressure differential must improve, or we keep working. This verification step is part of The Garrison Standard, not an upsell. Roy Castellanos insists on it because guessing isn’t a standard.
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.
Trusted Brands We Service in Windermere
Our equipment roster includes Rotobrush rotary systems, Nikro negative-air machines, and sealing and filtration products from Aprilaire, Abatement Technologies, and Guardsman. We stock mastic compounds and reinforcement mesh compatible with the duct materials found in Windermere’s custom homes, including older galvanized steel, fiberglass board, and modern flex duct. Parts availability means most Windermere jobs complete in a single visit without waiting on supplier delivery from Orlando. When we seal a system, we use the same materials commercial crews specify for hospitals and schools, not hardware-store tape that peels in six months.
Common Duct Sealing Problems We See in Windermere Homes
- Lakefront condensation corrosion. Homes on the Butler Chain of Lakes develop moisture accumulation inside attic ductwork during the summer rainy season. That moisture corrodes metal seams and dissolves mastic, creating leaks that standard inspections miss because the damage is hidden inside the insulation wrap.
- Multi-zone imbalance from partial failures. Windermere’s 3,000 – 8,000-square-foot homes often have zones that were never properly balanced. When one zone’s seals fail, the system overcompensates, overcooling some rooms while others stay humid. Homeowners blame the AC unit; the real problem is duct leakage.
- 1990s-era flexible duct degradation. Many Windermere estates built in the 1990s and early 2000s used flexible duct with wire helix supports that sag and kink over decades. The sagging creates turbulent airflow and stress cracks at connection points that tape alone cannot fix.
- Spray-foam encapsulation hiding gaps. Newer Windermere builds sometimes encase ductwork in spray foam for thermal performance. This works until a joint fails underneath, at which point the foam traps moisture against the metal and accelerates corrosion while concealing the leak location entirely.
Pricing for Duct Sealing in Windermere, FL
We give written prices before any work starts, and they don’t move at the door. For Windermere homes, here’s what duct sealing typically costs:
| Service | Typical Range |
|---|---|
| Single-zone repair (partial seal) | $850 – $1,400 |
| Whole-home duct sealing (2 – 3 zones) | $1,800 – $2,800 |
| Large home sealing (4+ zones, 5,000+ sq ft) | $2,800 – $3,500 |
| Flexible duct replacement with sealing | $2,200 – $4,000 |
What moves the price: home size, number of zones, attic accessibility, whether existing ductwork requires replacement versus sealing only, and whether we need to remove spray-foam encapsulation to access leaks. We also offer Air Duct Cleaning in Windermere and Dryer Vent Cleaning in Windermere as bundled services when your system needs comprehensive attention. Every estimate is free, and every job carries our 365-Day Done Right Promise. Call (361) 326-5060 for exact pricing on your home.
We Also Serve Cities Near Windermere
Our crews regularly work in Windermere and the surrounding communities: Winter Garden to the west, Ocoee to the northwest, Oakland to the north, and Apopka to the northeast. The same written pricing, same background-checked technicians, same 365-Day Done Right Promise applies across the entire service area.
Serving Windermere, FL - Our Local Coverage Area
We’re based in the Windermere 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 Windermere
We typically schedule Windermere appointments within 2 – 4 business days, with emergency scheduling available for homes where duct leakage has caused complete system failure or visible mold around registers. Call (361) 326-5060 for next available openings.
Yes, we seal ducts throughout Windermere, including the Butler Chain lakefront properties, the neighborhoods along Maguire Road, and the newer developments near the Orange County line. Large estates with multiple zones are our standard job, not an exception.
We prioritize calls where duct failure has caused system shutdown or where indoor air quality is immediately compromised, such as visible mold or collapsed ductwork blocking airflow entirely. Our phones are answered by a live person 24/7 to assess urgency and schedule accordingly.
Windermere prices run roughly 10 – 15% higher than standard Orlando tract homes because of larger home sizes, more zones per system, and the frequent need to work around spray-foam encapsulation or custom attic configurations. We quote each home individually before work begins.
Every duct sealing job is covered by our 365-Day Done Right Promise in writing. If any sealed joint fails within one year, Hollis returns and repairs it at no charge, including a free second visit. This is backed by the Garrison Partners family track record since 2004, not a verbal assurance.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Windermere as part of the Garrison Partners family since 2004.