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 Gloucester
Duct sealing in Gloucester, MA typically costs $450 – $1,200 for a whole-home system, depending on accessibility and the extent of leakage found during inspection. Most Gloucester jobs take a half day to complete, and we provide a written price before any work begins. Call (361) 326-5060 for a free estimate.
We’ve worked on duct systems throughout Gloucester, from the tight colonial streets downtown to the capes and ranches off Route 128. Our crews know the parking restrictions on Stacy Boulevard, the narrow staircases in triple-deckers near the harbor, and how to schedule around tide-dependent access in the Fort neighborhood. Dispatch and scheduling are coordinated from our Boston office, but the technicians who arrive at your Gloucester door are local to the North Shore and carry the tools to handle salt-corroded metal, asbestos-wrapped ducts, and shared building systems that other outfits walk away from.
Why Hollis Air Duct Cleaning Is Gloucester’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. That track record matters in Gloucester, where homeowners have seen plenty of contractors come down from New Hampshire for the summer and disappear by Labor Day. We’re here year-round.
Our Duct Sealing in Gloucester work is backed by the 365-Day Done Right Promise: if the seal fails, the musty odor returns, or the blower starts short-cycling again within a year, we come back and make it right at no charge. That includes a free second visit, not a negotiation.
Every technician is background-checked and uniformed. You know who’s walking into your home before they arrive. The price is written down before we touch anything, and it does not move at the door. Phones are answered by a live person 24 hours a day, seven days a week. No voicemail loops. No callback queues.
We don’t compete on the lowest teaser price. We compete on showing up inside the quoted window, pricing in writing, completing the job by the book, and leaving the site clean. That’s The Garrison Standard.
Duct Repair in Gloucester
Duct Repair in Gloucester often starts with a homeowner noticing uneven heating between rooms, a blower that runs constantly, or dust that seems to come from nowhere. In this city, the repair frequently involves more than patching a hole. Salt-laden coastal air corrodes metal ductwork from the inside, especially in harbor-adjacent homes where return pulls in fog off the Atlantic. We inspect with a camera first, identify the failure point, then clean and neutralize corroded surfaces before any sealing or patching begins.
Most duct repair jobs in Gloucester run $350 – $800. Where asbestos-wrapped ducts are involved, we coordinate with certified abatement specialists rather than disturb hazardous material.
Corrosion Prep Before Sealing
Sealant fails prematurely on salt-corroded duct metal near the harbor. We clean and neutralize surfaces before applying mastic, using rotary brush agitation from Rotobrush systems to remove loose oxidation. The seal then bonds to sound metal, not to crumbling rust.
Shared System Coordination
In dense downtown multifamily buildings with shared returns, sealing one unit’s branch without addressing the common stack leaves cross-unit leakage and mold spores circulating between apartments. We assess the whole system, document what we can access, and explain the limits clearly before work starts.
Air Duct Sealing in Gloucester
Air Duct Sealing in Gloucester targets the gaps, joints, and seams where conditioned air escapes before reaching your rooms. In a typical Gloucester home, 20 – 30% of heated or cooled air leaks into attics, crawl spaces, or wall cavities. That percentage climbs higher in older housing stock with original ductwork, which describes much of this city.
We use mastic and mesh for permanent seals, not duct tape. Mastic is a thick, paintable compound that remains flexible through freeze-thaw cycles. We pair it with fiberglass mesh at joints and seams for reinforcement. For accessible duct runs, we also apply aerosol sealant that finds leaks we can’t see. A whole-home sealing job in Gloucester typically runs $450 – $1,200.
Mastic Application for Coastal Conditions
Standard sealants crack within a winter in Gloucester’s attics and crawl spaces. Ice dams and freeze-thaw cycles open gaps at duct joints if the material isn’t rated for thermal movement. We specify sealants tested for New England temperature swings, applied over cleaned, neutralized metal.
Aerosol Sealing for Tight Spaces
Some Gloucester homes have ducts buried in plaster walls or tucked under original floorboards where hand application is impossible. Aerosol sealant, blown through the duct system under pressure, deposits at leak points and builds a flexible seal from the inside. No demolition required.
Trusted Brands We Service in Gloucester
Our Duct Sealing crews carry professional-grade equipment from Nikro, Honeywell, and Aprilaire. The Nikro negative-air machines we use for containment and source removal are the same units commercial crews run on hospital and school jobs. Honeywell and Aprilaire filtration products let us upgrade your system while we’re sealing, if the ductwork can support improved airflow. We stock common fittings and sealants locally, so a Gloucester job doesn’t wait on parts shipping from a warehouse three states away. That matters when you’re trying to schedule around a nor’easter or a busy fishing season when contractors are thin on the ground.
Common Duct Sealing Problems We See in Gloucester Homes
- Salt deposits in return ducts. On Stacy Boulevard and in the Fort neighborhood, we regularly find white salt bloom inside return ducts. This isn’t dust. It’s coastal air infiltration, and it means the duct system is pulling in unfiltered, humid, salt-laden air from outside. Sealing has to address both the air leak and the corrosion it’s already caused.
- Freeze-thaw damage in attics and crawl spaces. Gloucester’s marine climate keeps attics damp in winter. Ice dams form, melt, and reform. Duct sealant that isn’t rated for this movement cracks and separates, re-opening gaps within a single heating season. We see this in capes and ranches from the 1950s and 60s with attic-mounted air handlers.
- Asbestos-wrapped ducts in pre-1980s housing. Much of Gloucester’s housing stock predates modern building codes. Asbestos-wrapped ducts require careful handling. We don’t disturb them without proper containment and, when necessary, coordination with certified abatement contractors. Sealing may be possible around the wrap, or the wrap may need professional removal first.
- Shared dryer vent stacks in downtown multifamily buildings. In dense neighborhoods near the harbor, multiple units vent through a common stack. One disconnected or leaking joint pressurizes the whole system, forcing lint and moisture into adjacent units. Sealing the stack properly reduces fire risk and stops cross-unit air transfer.
Pricing for Duct Sealing in Gloucester, MA
Whole-home duct sealing in Gloucester typically runs $450 – $1,200. Duct repair, when corrosion or physical damage is involved, usually falls between $350 – $800. What moves the number:
- Accessibility: crawl spaces and unfinished attics cost less than ducts buried in finished walls
- Extent of leakage: a blower-door test or pressure pan measurement tells us how much air is escaping
- Corrosion severity: salt-damaged metal requires cleaning and neutralization before sealing
- Asbestos presence: if found, abatement coordination adds cost and time
- Shared systems: multifamily buildings with common returns require more assessment time
We give one flat price per system, agreed in writing before work starts. No per-vent pricing. No add-ons at the door. We show before-and-after photos of your own ducts so you know what was done. Estimates are free. Call (361) 326-5060.
We Also Serve Cities Near Gloucester
Our crews work throughout the North Shore, including Gloucester and neighboring Rockport, Essex, Ipswich, and Beverly. Each community has its own housing stock and coastal conditions, and we adjust our approach accordingly. Rockport’s granite construction presents different access challenges than Beverly’s denser multifamily blocks. We know the difference because we work in all of them regularly.
Serving Gloucester, MA - Our Local Coverage Area
We’re based in the Gloucester 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 Gloucester
Homes in the Fort sit within a few hundred feet of the harbor, and return ducts there routinely show white salt deposits from coastal air infiltration. This salt corrodes metal ductwork and fosters mold growth that inland homes simply don’t experience. Sealing in the Fort requires cleaning and neutralizing corroded surfaces before applying sealant, or the new seal fails within a year or two. Call (361) 326-5060 for a free inspection if you live near the waterfront.
Yes, we schedule around Gloucester’s parking restrictions and coordinate with building management for equipment access. In downtown multifamily buildings with shared systems, we assess whether the common return stack also needs attention, since sealing one branch without addressing the whole stack leaves cross-unit leakage. We bring portable Nikro negative-air equipment that fits through standard doorways and elevators. Call (361) 326-5060 to discuss your building’s access situation.
We can often seal around asbestos-wrapped ducts without disturbing the wrap, but we don’t remove or puncture asbestos-containing material without proper abatement coordination. If the wrap is intact and the ducts are otherwise accessible, mastic sealing at joints and seams may still be possible. We’ll tell you exactly what we can and can’t do after a visual inspection, and we’ll document it in writing. Call (361) 326-5060 to schedule a look.
Yes. A leaking joint in a shared stack pressurizes the whole system, forcing lint and hot, moist air into adjacent units where it can accumulate. Sealing the stack properly restores designed airflow, reduces lint buildup, and stops the cross-unit transfer that makes one person’s dryer problem everyone’s hazard. For dedicated vent maintenance, see our Gloucester Dryer Vent Cleaning service. We inspect the full stack when possible and seal accessible joints with mastic rated for dryer exhaust temperatures. Call (361) 326-5060 for an estimate.
High humidity keeps duct surfaces damp, which can prevent sealant from bonding properly if we don’t account for it. We use dehumidification and negative-air containment from Nikro equipment to dry work areas before applying mastic. Summer’s damp air also encourages mold growth inside ducts, so we often recommend source removal with Rotobrush agitation before sealing, especially if there’s visible microbial growth. The seal then performs as designed, not as a cover for an underlying problem. Call (361) 326-5060 to discuss your home’s conditions.
Ready to stop losing heated and cooled air to your attic, crawl space, or the harbor breeze? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate on duct sealing in Gloucester. We’ll inspect your system, show you what we find, and give you a written price before any work begins. Every job is covered by our 365-Day Done Right Promise.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Gloucester and the North Shore.