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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After
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AfterFast, Reliable Duct Sealing Across Casselberry
Duct sealing in Casselberry typically runs $800 – $2,400 for a whole-home system, and most jobs are scheduled within a week of your call. If you’re living in one of Casselberry’s older ranch homes off Winter Park Drive or near Secret Lake, your flex duct has likely been baking in a 140°F attic since the Carter administration. That heat degrades the liner, loosens the tape at joints, and turns your ductwork into a leaky, inefficient mess that drives up your FPL bill and dumps fiberglass particles into the air you breathe.
We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and we’ve been sealing and repairing duct systems since 2004. Our dispatch office in Miami coordinates scheduling for our Casselberry crews, and we know the local housing stock: the 1970s ranches with original flex duct, the split-levels off Semoran Boulevard with partial replacements that never matched up right, and the denser pockets near Casselberry Elementary where shared building systems complicate every job. When you call (361) 326-5060, a live person answers, 24 hours a day. No voicemail. No callback queue.
Why Hollis Air Duct Cleaning Is Casselberry’s Preferred Duct Sealing Company
Casselberry homeowners don’t need another coupon in the mailbox promising a $49 whole-house special that balloons to $900 at the door. They need a crew that shows up in a marked van, in uniform, with a written price before anyone touches a tool. That’s The Garrison Standard, and it’s how we operate on every job in Seminole County.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. We price every duct sealing job in writing before work starts, and that number doesn’t move once we’re on-site. No per-vent add-ons. No “we found another problem” upsells. Our 365-Day Done Right Promise covers every seal, every joint, every repair: if it fails within a year, we come back and make it right at no charge, including a free second visit.
We carry professional-grade equipment from Rotobrush and Nikro, plus sealing and filtration products from Honeywell, Aprilaire, and Abatement Technologies. These are the same tools commercial crews use on hospitals and schools, not hardware-store patch kits. And because we’ve worked Casselberry’s neighborhoods for years, we recognize the failure patterns before we even pull into your driveway: the degraded flex near Secret Lake, the mismatched transitions in the older subdivisions off Lake Howell Road, the moisture damage after summer surge events around Casselberry Elementary.
Duct Repair in Casselberry
Duct Repair in Casselberry starts with understanding what kind of duct you’re actually living with. Most homes here were built between 1960 and 1990 with flexible ductwork routed through attics that hit 140°F on summer afternoons. That heat doesn’t just loosen tape and mastic; it degrades the duct liner itself, causing it to crumble and release fiberglass particles into your supply air. Our Duct Sealing team sees this constantly in the ranch homes off Winter Park Drive and in the older sections near Secret Lake.
When we repair duct in Casselberry, we inspect the full run with a camera first. If the liner is compromised, sealing over it traps particles instead of solving the problem. We remove degraded sections, replace with properly rated flex or rigid duct where appropriate, and seal all junctions to NADCA standards with mastic and mechanical fasteners. A typical duct repair in Casselberry runs $400 – $950 depending on linear footage and accessibility.
Attic Heat Damage
The 140°F attic temperatures in Casselberry’s unventilated spaces cook standard duct tape adhesive within five to seven years. We replace failed tape with UL-181 rated foil tape and water-based mastic that flexes with temperature swings. In severe cases, we wrap exposed runs with R-8 insulation to cut heat gain and protect the repair long-term.
Partial Replacement Mismatches
Many Casselberry homes have had one section replaced while the rest remains original. The transition between old and new materials often gaps within a few seasons. We cut back to solid substrate on both sides, install a proper collar, and seal with reinforced mastic rather than bridging the gap with tape alone.
Air Duct Sealing in Casselberry
Air Duct Sealing in Casselberry addresses the conditioned air you’re paying to cool that never reaches your living spaces. In a typical older ranch here, 20 – 30% of cooled air leaks into the attic through gaps at plenum joints, trunk connections, and register boots. You’re cooling your insulation while your bedrooms stay stuffy. Our Duct Sealing in Casselberry service targets these losses with a systematic approach: pressurize the system, locate leaks with smoke or digital detection, seal with mastic or aerosol depending on access, and verify results with a post-test.
Whole-home air duct sealing in Casselberry generally costs $800 – $2,400. Smaller homes with accessible attics and straight runs fall at the lower end. Homes with multiple zones, restricted access, or significant damage requiring repair before sealing land higher. We give you a written price after inspection, before any sealing begins.
Aerosol vs. Manual Sealing
For accessible attic trunk lines, we apply mastic by hand, working each joint until it’s sealed to NADCA standards. For complex systems with multiple leaks or restricted access, we may recommend aerosol sealing, which pressurizes the duct and seals from the inside. We explain which method fits your system and why, in plain terms, before you decide.
Post-Storm Moisture Protocol
Casselberry’s summer afternoon thunderstorms cause power surges that trip older air handlers, leaving duct interiors damp. Sealing over moisture traps mold. We verify dryness with moisture meters before applying sealant, and we flag any sections showing active colonization for cleaning or replacement first.
Trusted Brands We Service in Casselberry
We stock sealing materials and replacement components from Honeywell, Aprilaire, Abatement Technologies, and Guardsman for Casselberry jobs, which means faster turnaround and no waiting on shipping for standard repairs. Our rotary brush systems from Rotobrush and negative-air equipment from Nikro handle the pre-sealing cleaning that compromised duct often needs. When we pull up to your Casselberry home, the van carries what’s required to complete the job in one visit, not two. That’s part of The Garrison Standard: arrive prepared, price in writing, finish clean.
Common Duct Sealing Problems We See in Casselberry Homes
- Flex duct liner degradation in 140°F attics. The original 1970s – 80s flex in Casselberry’s ranch homes crumbles under sustained heat exposure. Sealing over a compromised jacket traps fiberglass particles in the airflow. We inspect with a camera and replace degraded sections before sealing anything.
- Mismatched old and new duct sections from partial replacements. Homeowners who replaced one failing run years ago now have transition gaps that aerosol sealing won’t bridge. We remove the mismatch, install proper collars, and seal from solid substrate.
- Post-surge moisture peeling uncured sealant. Afternoon thunderstorms around Casselberry Elementary trip older air handlers, leaving damp duct interiors. Sealant applied over moisture fails within months. We dry, test, then seal.
- Shared building systems complicating isolation. In denser Casselberry housing near the commercial corridors, condo and apartment stacks share duct or dryer vent runs. We identify your unit’s boundaries with camera inspection before sealing, and we coordinate access with building management when needed.
Pricing for Duct Sealing in Casselberry, FL
Here’s what duct sealing actually costs in Casselberry’s market, based on the jobs we’ve completed here:
| Service | Typical Range |
|---|---|
| Whole-home duct sealing (manual mastic) | $800 – $1,600 |
| Whole-home duct sealing (aerosol method) | $1,200 – $2,400 |
| Duct repair per linear foot (replacement) | $400 – $950 total |
| Insulation wrap for exposed attic runs | $200 – $500 |
| Camera inspection and leak detection | $150 – $250 (credited toward sealing) |
What moves you within these ranges: attic accessibility (crawl vs. walk-in), linear footage of duct, number of zones, and whether we find damage requiring repair before sealing. We inspect first, write the price down, and you approve it before we start. No per-vent pricing. No teaser rates that triple at the door. Call (361) 326-5060 for a free estimate; we’ll give you a real number you can plan around.
We Also Serve Cities Near Casselberry
Our crews work throughout Seminole County, including Casselberry, Winter Springs, Altamonte Springs, Maitland, and Longwood. Each area has its own housing patterns and duct failure modes; we adjust our approach accordingly rather than running the same playbook everywhere.
Serving Casselberry, FL - Our Local Coverage Area
We’re based in the Casselberry 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 Casselberry
Casselberry’s denser tree canopy of oaks and pines traps humidity in attic spaces, and the city’s older 1960 – 1990 housing stock has original flex duct that newer Winter Springs builds simply don’t have. The combination of 140°F attic heat and degraded liner means seals applied over compromised substrate fail within a season. We replace degraded sections first, then seal. Call (361) 326-5060 for an inspection.
Yes, but we need to isolate your unit’s boundaries with a camera inspection first. We identify where your duct branches from the common stack, seal only your runs, and document our work for your HOA if required. We coordinate building access when needed. Call (361) 326-5060 to schedule.
Indirectly, yes. The heavy oak and pine cover keeps attic humidity higher and longer than in cleared developments, and pollen loads clog outdoor intakes that ventilate some attic spaces. We check intake pathways and recommend filtration upgrades if your system draws from under-eave vents. The sealing itself happens inside the duct, but the environment affects how long it lasts. Call (361) 326-5060 for specifics on your home.
We use portable negative-air and aerosol equipment from Nikro that fits in a standard cargo van, not a dedicated truck. For manual sealing, we carry mastic and tools by hand. We coordinate with property management for loading zone access or schedule during low-traffic hours. Call (361) 326-5060 and we’ll work out the logistics.
Shared dryer vent stacks are a separate system from HVAC duct, but we clean and seal them too, including our Dryer Vent Cleaning in Casselberry. We camera the full stack to locate blockages and disconnections, then clean with rotary brushes and seal joints with fire-rated mastic. We document before-and-after photos for your property manager. Call (361) 326-5060 for a stack inspection.
Our techs pulled up to a 1970s ranch near Secret Lake where the homeowner complained of fiberglass dust on the registers after every run cycle. Camera inspection showed the original flex duct had a torn, crumbling liner in the attic run, so we sealed the plenum and trunk junctions to NADCA standards and wrapped the exposed sections with R-8 insulation to cut attic heat gain. The dust complaint cleared within a week.
Ready to stop cooling your attic and start cooling your home? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate on duct sealing in Casselberry. We’ll inspect your system, write the price down before we start, and back our work with the 365-Day Done Right Promise. Live person answers the phone, day or night.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Casselberry since 2004.