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 Franklin Town
Duct sealing in Franklin Town typically runs $800 – $2,400 for a whole-home system, with most jobs completed in a single day. We’re the Duct Sealing crew that serves Franklin Town from our Boston office, dispatching teams who know the difference between a standard flex-duct job and the retrofitted systems hidden in the town’s antique colonials. Call (361) 326-5060 for a written estimate before any work starts.
Franklin Town’s housing stock is unlike most Boston suburbs. The historic districts near Dean College and along Main Street are packed with 18th- and 19th-century colonials and Cape Cods where modern forced-air HVAC was shoehorned through original plaster walls, horsehair insulation, and unsealed balloon framing. That retrofit work, done decades ago in many cases, created pathways for wall-cavity air, basement soil-zone moisture, and attic dust to leak straight into your supply and return ducts. We see it on nearly every older home we open up. The ducts aren’t just dirty; they’re actively pulling in air from places you don’t want to breathe.
Our crews serving Franklin Town carry Rotobrush rotary systems and Nikro negative-air machines, but the real tool on these older homes is a duct camera and the patience to trace retrofitted runs without punching through fragile plaster. We don’t guess where the leaks are. We find them, photograph them, and show you before we seal anything.
Why Hollis Air Duct Cleaning Is Franklin Town’s Preferred Duct Sealing Company
We’ve been doing this since 2004 as part of the Garrison Partners family, and our Franklin Town work-including Franklin Town Dryer Vent Cleaning-is built on repeat calls from homeowners who’ve watched us trace a problem to its source instead of masking it. The 365-Day Done Right Promise covers every sealing job in writing: if the mastic fails, if a seam opens, if basement air starts short-circuiting again, we come back at no charge. That includes a free second visit, not a negotiation.
Our technicians are background-checked, uniformed, and expected to operate under The Garrison Code: arrive inside the quoted window, price in writing before touching anything, complete the job by the book, and leave the site clean. No exceptions for Franklin Town or anywhere else we serve. Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues.
What separates us in Franklin Town specifically is experience with the town’s retrofit duct pathology. A crew that knows how to seal standard flex-duct in a 1990s ranch will damage a 1890s colonial if they treat it the same way. We’ve trained our teams on low-pressure methods, HEPA containment, and the mastic-and-mesh techniques that bond to old metal and stone without requiring demolition.
Duct Insulation in Franklin Town
Duct Insulation in Franklin Town addresses a problem most homeowners don’t know they have: conditioned air bleeding into unheated attic or basement spaces through thin, unwrapped metal ductwork, or conversely, freezing winter air and humid summer air infiltrating the supply stream. In Franklin Town’s antique homes, we often find retrofitted trunk lines running through original uninsulated wall cavities or across damp stone basement ceilings where freeze-thaw condensation has promoted rust and microbial growth. Proper insulation, paired with sealing, stops both the energy loss and the moisture cycling that degrades your ducts.
A typical duct insulation job in Franklin Town runs $600 – $1,800 depending on accessible linear footage and whether we’re wrapping existing metal or replacing degraded flex. We use professional-grade materials from Abatement Technologies and Guardsman, specified to R-6 or R-8 values appropriate to Massachusetts energy code.
Attic and Basement Run Wrapping
Uninsulated ducts in Franklin Town’s unheated attics and damp stone basements lose 20 – 30% of conditioned air before it reaches your vents. We wrap accessible metal trunk lines with foil-faced fiberglass or closed-cell sleeve insulation, sealed at every seam with mastic, not tape that will peel in the humidity.
Wall Cavity and Chase Solutions
Where retrofitted ducts run through original plaster wall cavities with no proper chase, full wrapping isn’t always possible. We inject dense-pack insulation around the duct where accessible and seal all register boots and pan connections to stop the thermal bridging that creates condensation spots inside your walls.
HVAC Duct Sealing in Franklin Town
HVAC Duct Sealing in Franklin Town is most often needed when homeowners notice uneven heating or cooling, musty odors when the system runs, or utility bills that climb without explanation. In our market, the root cause is frequently leakage at retrofitted connections: seams between old and new ductwork, unsealed return pans in stone foundations, or crushed branch feeders behind plaster that were never properly connected in the first place. We seal with mastic and fiberglass mesh, not duct tape, because tape fails within a season in Franklin’s humidity swings.
Typical HVAC duct sealing in Franklin Town costs $800 – $2,400 for a whole-home system, with simpler single-zone jobs at the lower end and multi-story antique homes with complex retrofits toward the upper end. Every price is written down before we start.
Camera Inspection and Leak Mapping
We don’t seal blind. Our process starts with a duct camera run through the trunk and branch lines to locate disconnections, crushed sections, and points where wall-cavity air is entering the stream. On a recent job near Dean College, camera inspection revealed a retrofitted branch that had separated completely behind original plaster, dumping basement air into the bedroom supply. We accessed it through the register boot, removed the debris, and sealed the reconnection.
Mastic Application and Pressure Testing
After source removal and mechanical repair, we seal all seams, joints, and register connections with water-based mastic reinforced with mesh tape. We then pressurize the system and verify with a duct blaster or smoke pencil that leakage is below 10% of total airflow. If it isn’t, we find the missed point and fix it before we leave.
Trusted Brands We Service in Franklin Town
Our Franklin Town crews work with professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, the same tools specified for commercial and healthcare ductwork. We stock sealing mastics, fiberglass mesh, and insulation sleeves sized for both standard flex-duct and the older metal pipe common in Franklin’s historic homes. For filtration upgrades after sealing, we carry Honeywell and Aprilaire media cabinets and MERV 11 – 16 replacement filters. Parts are ordered through our Boston office for next-day availability on most items, so we’re not waiting on shipping while your system sits open.
Common Duct Sealing Problems We See in Franklin Town Homes
- Disconnected retrofitted runs behind original plaster. In Franklin Town’s historic districts, branch feeders installed during mid-century HVAC retrofits have often separated from trunk lines where they pass through fragile lath-and-plaster walls. The gap pulls wall-cavity dust and insulation fragments directly into your supply air. We camera-locate these breaks and seal them through register access where possible, avoiding wall demolition.
- Unsealed return pans in stone foundation basements. Many Dean College-area homes have return air pans sitting directly on original basement stone, drawing soil-zone moisture, rodent debris, and musty air into the air handler. Sealing the pan-to-stone joint with mastic and installing a proper sill seal stops this contamination pathway.
- Balloon framing channels connecting attic to basement. Franklin Town’s unsealed balloon-frame walls act as interstitial ducts, allowing attic air to drop to the basement and enter return pathways in winter, and humid basement air to rise in summer. We seal framing channels at each floor and at the basement connection point.
- Freeze-thaw condensation damage in poorly insulated runs. Franklin’s cold winters and humid summers create condensation cycles in uninsulated ductwork near unheated spaces, promoting rust that eats through metal seams and microbial growth that recontaminates sealed systems. We address insulation simultaneously with sealing to break this cycle.
Pricing for Duct Sealing in Franklin Town, MA
A typical whole-home duct sealing job in Franklin Town runs $800 – $2,400. Single-zone sealing on a ranch or split-level in Franklin Heights or Pond Street neighborhoods typically falls at the lower end, around $800 – $1,400. Multi-story antique colonials in the historic district with complex retrofitted systems, multiple disconnections, and stone-foundation return repairs range $1,800 – $2,400.
What moves the price: linear footage of accessible ductwork, number of identified leaks requiring repair, whether insulation replacement is needed alongside sealing, and accessibility (crawl spaces and tight plaster chases take longer). We do not quote per-vent or per-register prices. One flat price per system, agreed in writing before work starts. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Franklin Town
Our Boston office dispatches crews throughout the metro area, including Duct Sealing in Franklin Town and surrounding cities: Boston, Worcester, Cambridge, and Lowell. Each location operates under The Garrison Standard with independently owned service teams.
Serving Franklin Town, MA - Our Local Coverage Area
We’re based in the Franklin Town 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 Franklin Town
Yes. We access most retrofitted ductwork through existing register boots and small utility openings, using flexible camera tools and long-reach sealant applicators. When we must open a wall, we cut a discrete access panel in an inconspicuous location and restore it cleanly. We’ve completed sealing jobs on pre-1900 homes in Franklin Town with zero plaster damage. Call (361) 326-5060 to discuss your specific layout.
The odor is almost always unsealed return pathways pulling air from the wrong places: basement stone foundations, wall cavities with old horsehair insulation, or attic spaces connected through balloon framing. In Franklin Town’s historic homes, these pathways are built into the retrofit duct design. We camera-inspect to find the source, remove any debris or microbial growth with HEPA-contained negative-air methods, then seal the leak points with mastic and mesh.
Yes. We regularly seal return pans and duct boots sitting on original stone foundations in Franklin Town’s older neighborhoods. The process involves cleaning the stone surface, removing rodent debris and cobwebs with HEPA vacuum containment, applying a sill seal or closed-cell foam barrier where appropriate, and finishing with mastic-rated mesh to create a durable, flexible joint that won’t crack with seasonal moisture movement.
Franklin’s cold winters and humid summers cause metal ductwork in unheated spaces to cycle through condensation and drying, which expands and contracts seams and degrades tape adhesives. Sealing with mastic, which remains flexible after curing, outlasts tape by years. We also evaluate whether insulation is needed alongside sealing to prevent the condensation that would eventually undermine even good mastic work.
Every job includes: full camera inspection of accessible trunk and branch lines; source removal of debris, nests, or microbial growth with HEPA-contained negative-air equipment; mechanical repair of disconnected or crushed sections; mastic-and-mesh sealing of all seams, joints, boots, and pan connections; pressure or smoke verification of reduced leakage; and written documentation of what was found and what was sealed. The 365-Day Done Right Promise covers all sealing work: if it fails, we return and make it right at no charge. Call (361) 326-5060 for a free estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Franklin Town and the greater Boston area since 2004.