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 Towson
Duct sealing in Towson typically costs $350 – $850 for a whole-house seal, depending on system size and accessibility, and most jobs are scheduled within a week with a written price locked before we start. If you’re in Rodgers Forge, West Towson, or near the courthouse district and your upstairs rooms never reach temperature, the problem is often leaking joints and disconnected runs, not your HVAC unit itself.
Our crews dispatch from our Baltimore office and serve Towson homeowners directly, including those who need Towson Dryer Vent Cleaning. We know the local housing stock: the post-WWII capes with knee-wall branch runs, the pre-war Victorians with galvanized steel trunks, and the rental conversions near Towson University where years of tenant turnover mean ductwork that’s never been properly inspected. When we arrive, we bring HEPA-filtered negative-air equipment, asbestos-awareness training for older homes, and a written price that doesn’t move once we’re inside. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Towson’s Preferred Duct Sealing Company
We’ve been part of the Garrison Partners family since 2004, and our Duct Sealing in Towson work follows The Garrison Standard: arrive inside the quoted window, price in writing before touching anything, complete the job by the book, and leave the site clean. Towson homeowners aren’t looking for the cheapest bid. They’re looking for the bid they can trust.
Our technicians are background-checked and uniformed. You’ll know who’s walking into your home before they arrive. Every duct sealing job carries our 365-Day Done Right Promise in writing: if the seal fails or the leak returns 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. No waiting until Monday to schedule.
We stock professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, plus filtration products from Honeywell and Aprilaire. These are the same tools commercial crews use, not hardware-store gear, and we explain what each piece does while we’re working.
Duct Repair in Towson
Duct Repair in Towson often starts with a complaint that sounds like an HVAC problem: one room won’t heat, the basement smells musty, or the blower runs constantly without catching up. In our experience, the real culprit is usually physical damage to the ductwork itself. Crushed branch runs behind knee walls in Rodgers Forge capes. Fully disconnected joints in rental properties near Towson University where maintenance has been deferred for years. Galvanized steel trunks in West Towson homes that have separated at the seams after eight decades of expansion and contraction.
We don’t guess. Our techs run a camera inspection first, then show you what we found. If the duct is crushed, disconnected, or rusted through, sealing alone won’t fix it. The repair comes first. Then we seal.
When Repair Comes Before Sealing
A duct sealing job is only as good as the duct behind it. We’ve seen crews in Towson apply mastic over crushed flex duct or tape up joints that are structurally failing. That seal lasts one season, maybe two. We repair the physical damage first, whether that’s replacing a crushed branch run, reconnecting a separated joint, or patching a corroded section of galvanized trunk. Then we seal. The result holds.
What Towson Repairs Typically Involve
Most repairs in Towson homes fall into two categories: reconnecting disconnected runs in post-WWII capes and ranchers, and replacing damaged sections in older galvanized systems. For the former, we often find the problem behind a knee wall or in an unconditioned attic. For the latter, we work with asbestos awareness protocols when original tape is present, using HEPA containment and proper encapsulation methods. Every repair gets a written price before we start.
Air Duct Sealing in Towson
Air Duct Sealing in Towson closes the gaps, joints, and seams where conditioned air escapes before it reaches your rooms. In a typical Towson home, we find 20 – 30% air loss through these leaks. You’re paying to heat and cool your crawl space, your attic, the gaps inside your walls. Sealing stops that waste.
We use duct sealing mastic, a thick, fiber-reinforced compound that remains flexible after curing, plus mesh reinforcement at stress points. For larger gaps or failing joints, we add mechanical fasteners before mastic. The work is done under negative pressure when possible, containing any disturbed particulate. Our equipment includes Nikro negative-air machines and HEPA filtration from Abatement Technologies.
Sealing After Source Removal
We don’t seal dirty ducts. If your system hasn’t been cleaned in years, sealing traps dust, mold spores, and debris inside. Our process: camera inspection, source removal with rotary brush agitation and negative-air extraction, then sealing. The Rotobrush system loosens buildup from duct walls; the Nikro machine pulls it out under controlled suction. Only then do we seal. This sequence matters. Skip it, and you’ve built a tight container for contaminated air.
Sealing Older Galvanized Systems
Towson’s pre-war homes, especially in West Towson and near the courthouse, often have original galvanized steel trunks with asbestos-containing tape at the joints. Sealing these requires asbestos awareness, not guesswork. Our technicians assess the tape condition before applying any mastic. If the tape is intact and undisturbed, we may encapsulate it with appropriate materials and seal over it. If it’s friable or damaged, we refer to a licensed abatement contractor. We don’t seal over hazards.
Trusted Brands We Service in Towson
We stock parts and filtration products from Honeywell, Aprilaire, and Guardsman for Towson customers, with fast turnaround on common sizes and configurations. Our equipment roster includes Rotobrush rotary brush systems for thorough duct cleaning before sealing, Nikro negative-air machines for containment during repair and seal work, and Abatement Technologies HEPA filtration for homes where asbestos awareness is required. These aren’t consumer-grade tools. They’re the same units commercial and industrial crews run, maintained to manufacturer spec, and operated by technicians trained on each platform. When your home has original ductwork from the 1940s or a rental system that’s seen a decade of neglect, that level of equipment discipline matters.
Common Duct Sealing Problems We See in Towson Homes
- Asbestos tape at galvanized joints in West Towson and courthouse-district homes. Original ductwork in these pre-war properties often has asbestos-containing tape at trunk and branch connections. Sealing without asbestos awareness disturbs fibers and creates a health hazard. We assess first, contain second, seal third.
- Crushed or disconnected branch runs in Rodgers Forge capes. The knee-wall spaces in these post-WWII homes are tight. Over decades, storage, renovation, or simple gravity can crush flex duct or pull joints apart. Mastic won’t fix a crushed run. We repair the physical damage, then seal.
- Mold-loaded returns in damp Towson basements. Our humid continental climate means basements stay damp year-round. Return ducts in these conditions grow mold and mildew. Sealing them without cleaning first traps that contamination. We clean with HEPA filtration, address the moisture source if possible, then seal.
- Undersized galvanized runs in rental properties near Towson University. Decades of deferred maintenance in student housing means ductwork that was barely adequate when installed now leaks at every joint. Sealing improves performance significantly, but we also flag when the entire system is undersized for the current load.
Pricing for Duct Sealing in Towson, MD
Duct sealing in Towson runs $350 – $850 for a typical single-family home, with most jobs falling in the $450 – $650 range. Smaller condos and townhomes near Towson University start around $300. Large Colonials in West Towson with complex basement-to-attic trunk systems can reach $900 – $1,200 when combined with necessary repairs.
What moves the price: system size and accessibility, whether we need to repair crushed or disconnected runs before sealing, and whether asbestos-awareness protocols are required for older homes. We do not quote per-vent pricing. We quote one flat price per system, agreed in writing before work starts. No add-ons at the door. No surprises.
Every estimate is free. We inspect with a camera, show you what we found, and give you a written price. You decide. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Towson
Our crews work throughout greater Baltimore County, including Parkville, Cockeysville, Pikesville, and Rosedale. Scheduling and dispatch are coordinated from our Baltimore office, with local technicians serving each community. If you’re in Towson or nearby and need Duct Sealing, we cover your area.
Serving Towson, MD - Our Local Coverage Area
We’re based in the Towson 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 Towson
Most Towson homes with original galvanized ductwork benefit significantly from sealing, provided the metal itself is structurally sound. We camera-inspect first. If the trunk is intact and the leaks are at joints and seams, sealing with mastic and mesh restores performance without the cost of full replacement. If the metal is rusted through or the system is dramatically undersized, we’ll tell you. Call (361) 326-5060 for an honest assessment.
Towson’s humid continental climate means ducts carry more moisture year-round, which accelerates mold growth in leaks and makes basement return ducts particularly prone to contamination. We always inspect for moisture loading before sealing. If your returns are moldy, sealing traps that problem inside. We clean first, then seal. The result lasts longer and smells better.
A typical Rodgers Forge visit starts with a camera inspection of the knee-wall branch runs, where we often find crushed or disconnected duct. We show you the footage, quote a written price for repair plus sealing, then source-remove any debris with HEPA filtration and negative pressure. Our tech reseals trunk and branch connections with mastic and mesh. Most capes take 4 – 6 hours. We were called to a 1948 Cape in Rodgers Forge where the second-floor registers barely moved air; a camera inspection showed a crushed branch run and several fully disconnected joints behind the knee wall. After source removal with HEPA filtration and negative pressure, our tech resealed the trunk and branch connections, and the homeowner’s upstairs bedrooms finally held temperature on a humid July afternoon.
Yes, but only after proper asbestos assessment. West Towson’s pre-war Victorians and Colonials often still carry original galvanized supply trunks wrapped with asbestos-containing tape at the joints, so a duct sealing job here sometimes begins as an asbestos-awareness assessment before any mastic or mesh goes on. If the tape is intact, we encapsulate and seal over it using HEPA containment. If it’s damaged or friable, we refer to a licensed abatement contractor. We do not disturb hazardous materials.
If you’ve had your ducts cleaned within two years and still have uneven temperatures, high utility bills, or rooms that never reach setpoint, the problem is likely leaks, not debris. We use a pressure test and camera inspection to distinguish between dirty ducts and leaking ducts. Cleaning fixes contamination. Sealing fixes loss. Some homes need both, in sequence. We’ll show you which with a free inspection. Call (361) 326-5060 to schedule.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Towson since 2004 as part of the Garrison Partners family.