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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Before
AfterFast, Reliable Duct Sealing Across Northborough
Your upstairs bedroom stays cold in January even when the heat’s blasting. Your energy bill climbed again this winter, and the contractor who looked at your furnace said nothing’s wrong with the unit itself. In Northborough, we’ve seen this exact pattern hundreds of times, especially in the 1980s and 1990s subdivisions off Route 20 where flexible plastic-core ductwork is hitting its 25 – 30 year failure cycle. We’re Hollis Air Duct Cleaning, and our Duct Sealing crew serves Northborough from our Boston office, typically scheduling within a few days and arriving inside the window we quote. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Northborough’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our reputation in Northborough is built on showing up when we said we would. Homeowners here don’t have patience for no-shows, especially when they’ve taken time off work or arranged their Saturday around a service window.
Our technicians are background-checked and uniformed, and they follow The Garrison Code on every job: arrive inside the quoted window, price the work in writing before touching anything, complete the job by the book, and leave the site clean. The 365-Day Done Right Promise covers every repair we make. If the seal fails within a year, we come back and make it right at no charge, including a free second visit.
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 get on the schedule.
HVAC Duct Sealing in Northborough
HVAC Duct Sealing in Northborough addresses a specific problem: conditioned air leaking out of your ductwork before it reaches the rooms you actually live in. In this market, we most often seal flexible plastic-core ducts in unconditioned attics and crawlspaces, particularly in subdivisions like Indian Meadow and Brigham Hill where that housing stock is now 25 – 35 years old. The mastic and metal tape we apply closes gaps at seams, connections, and punctures, restoring the pressure balance your system was designed for. A typical duct sealing job in Northborough runs $450 – $950 for a single system, depending on accessibility and the linear footage of ductwork involved.
When Sealing Beats Replacement
Not every failing duct needs to be torn out. If the flexible duct itself is intact but the seams are leaking, or if the inner insulation hasn’t begun shedding fiberglass into your air supply, sealing can extend service life by a decade or more. We inspect with a camera first and show you what we find.
Attic and Crawlspace Conditions
Northborough’s cold winters and humid summers punish ductwork in unconditioned spaces. Freeze-thaw cycles harden mastic over time, and summer humidity can degrade tape adhesives. We use professional-grade sealing compounds rated for the temperature swings these spaces see.
Duct Repair in Northborough
Duct Repair in Northborough covers the physical damage that sealing alone won’t fix: crushed flexible duct, disconnected runs, rusted metal sections in older center-hall Colonials, and the failing internal insulation that our technicians regularly find in 1990s-era homes off Route 20. When that insulation sheds fiberglass into the supply air, homeowners often notice respiratory irritation before they connect it to their HVAC system. Repair work typically runs $300 – $800 for localized fixes, or $1,200 – $2,500 when multiple runs need replacement. We also handle Air Duct Cleaning in Northborough and Dryer Vent Cleaning in Northborough if your system needs more than sealing or repair.
Fiberglass Insulation Failure
This is the hidden problem we flag most often in Northborough’s subdivision stock. The internal liner of flexible duct degrades, and the fiberglass beneath it enters your breathing air. We replace the affected sections with new, properly insulated duct and seal all connections.
Metal Duct Restoration
The antique homes near Northborough’s town center sometimes have original galvanized metal ductwork that’s corroded or poorly sealed at joints. We clean, repair, and reseal these systems rather than replacing functional metal that often outlasts modern flexible materials.
Trusted Brands We Service in Northborough
We carry equipment and materials from Rotobrush, Nikro, Abatement Technologies, and Guardsman, the same brands commercial HVAC crews specify. For Northborough homeowners, this means we don’t need to special-order basic repair parts. Our vans stock mastic, metal tape, flexible duct in common diameters, and replacement insulation. If your system uses Honeywell, Aprilaire, or Guardsman filtration components, we can inspect and reinstall those during the same visit. Turnaround on most Northborough jobs is same-week once we complete the free estimate.
Common Duct Sealing Problems We See in Northborough Homes
- Subdivision ductwork at end-of-life. The 1980s – 1990s building boom near routes 20 and 9 installed flexible plastic-core ductwork that’s now failing in predictable cycles. Seams split, connections sag, and conditioned air leaks into attics before reaching bedrooms.
- Freeze-thaw damage in unconditioned spaces. Northborough averages 50+ inches of snow annually, and attics drop below freezing for months. Thermal expansion loosens tape and cracks mastic, especially at joint angles where stress concentrates.
- Summer humidity degrading adhesives. July and August humidity in unconditioned crawlspaces weakens standard duct tape. We see this most in homes where the original builder used consumer-grade materials rather than proper HVAC mastic.
- Fiberglass shedding from degraded internal insulation. In Indian Meadow, Brigham Hill, and similar 1990s neighborhoods, the inner liner of flexible duct has degraded enough that fiberglass enters the air supply. Sealing won’t fix this; section replacement is required, and we identify it during camera inspection.
Pricing for Duct Sealing in Northborough, MA
A typical duct sealing job in Northborough runs $450 – $950 for a single residential system. Duct repair, when sections need replacement, typically falls between $300 – $800 for localized work or $1,200 – $2,500 for multiple runs. What moves the number: accessibility (crawlspace vs. full attic), linear footage of ductwork, whether we need to replace degraded flexible duct rather than seal it, and how many supply and return connections require attention.
We give you one flat price per system, agreed in writing before any work starts. No per-vent pricing, no add-ons once the van is in your driveway. You’ll see before-and-after photos of your own ducts, and the price we quote is the price you pay. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Northborough
Our crews work throughout the region, including Duct Sealing in Northborough and neighboring Westborough, Marlborough, Hudson, and Clinton. Scheduling and dispatch are coordinated from our Boston office, with local technicians serving each community.
Serving Northborough, MA - Our Local Coverage Area
We’re based in the Northborough 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 Northborough
We typically schedule Northborough appointments within 3 – 5 business days, and sometimes sooner depending on the season. Calls are answered by a live person 24/7, so you can book anytime. Call (361) 326-5060 to check current availability.
Yes, including Indian Meadow, Brigham Hill, the center-hall Colonials near the town center, and newer construction along Route 9. We’ve worked in the subdivisions off Route 20 enough to know the specific ductwork issues each era of construction presents.
We don’t use the word “emergency” for scheduled maintenance work, but if your system is completely down due to duct failure in extreme weather, call (361) 326-5060. Our live answering service will flag urgent requests and prioritize scheduling based on safety and system criticality.
Duct sealing in Northborough falls in the same $450 – $950 range we see across Westborough, Marlborough, Hudson, and Clinton. The specific age of Northborough’s 1980s – 1990s subdivision stock means we encounter more flexible duct failures here than in older mill towns with metal ductwork, which can shift repair recommendations but not base sealing prices.
Every repair is covered by our 365-Day Done Right Promise in writing. If the seal fails within a year, Hollis returns and makes it right at no charge, including a free second visit. This applies to all Northborough jobs and is not prorated or limited in service calls.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Northborough and surrounding communities.