Fast, Reliable Duct Repair & Sealing Across Hollis
Duct repair and sealing in Hollis, NH typically costs $280–$650 for standard residential work, with most jobs completed in a single visit by our Duct Repair & Sealing team. If you’re losing heated air into your basement or crawlspace, or your upstairs rooms never reach temperature, you’re not imagining it — Hollis’s sprawling rural duct systems are notorious for leaks at flex-duct connections and failing original sealant.
We’re based in Lowell, MA, and we make the drive up Route 3 to Hollis regularly. Thomas Hernandez handles every job personally, and he’s spent 14 years working on exactly the kind of multi-zone, long-trunk systems that dominate Hollis’s housing stock. Call (877) 517-5646 for a free estimate — we’ll give you an honest assessment of what’s leaking, what’s damaged, and what it’ll take to fix it.
Why Titan Air Duct Cleaning Lowell Is Hollis’s Preferred Duct Repair & Sealing Company
Hollis isn’t a quick in-and-out town for us. We’ve built our reputation here on showing up prepared for large custom homes with complex duct layouts — the 1980s colonials off Broad Street, the capes near Silver Lake, the newer builds out toward the Milford line. Our 389 verified reviews average 4.7 stars, and a significant portion come from Hollis homeowners who initially called us skeptical and ended up referring their neighbors.
Thomas Hernandez is the owner and the technician who arrives at your door. No subcontracted crew, no dispatcher sending someone you’ve never spoken to. That matters in Hollis, where homes sit on 2–5 acre lots and you don’t want to waste a morning waiting for a second truck because the first guy didn’t bring the right mastic or insulation for your crawlspace run.
Our response time to Hollis is typically same-day or next-day during the heating season, when duct leaks become impossible to ignore. We know the local roads — whether you’re off Route 122, near the Hollis Flea Market grounds, or back on a private way off Cobble Hill Road — and we bring equipment sized for real work: Rotobrush and Nikro systems for access and cleaning, Abatement Technologies HEPA containment when we’re dealing with the biohazard situations that are unfortunately common here.
Our Duct Repair & Sealing Services in Hollis
Duct Sealing with Mastic Sealant
Hollis’s original duct tape is failing. Homes built between 1978 and 2005 were sealed with cloth-backed adhesive that degrades after 15–20 years, especially in damp basements and crawlspaces. We remove the old residue, prep the galvanized metal with proper surface preparation, and apply mastic sealant — a fiber-reinforced compound that remains flexible and airtight for decades. In Hollis’s rural homes, where duct runs can exceed 150 linear feet, every unsealed joint adds up to significant energy loss and uneven heating.
Flex Duct Repair
This is where Hollis’s wooded lots create unique problems. Mice and squirrels exploit gaps at flex-duct connections, chewing through the plastic liner and fiberglass insulation to nest in the warm airflow. We’ve found active infestations in basement and crawlspace runs from homes on Old Milford Road, Broad Street, and throughout the 03049 zip code. Our process: remove the damaged section, HEPA-extract droppings and nesting debris with Abatement Technologies equipment, sanitize the remaining trunk, then install new flex with proper supports and sealed collars. We don’t just patch over biohazard — we eliminate it.
Metal Duct Repair
Long main-trunk runs in Hollis’s larger homes develop separations at seams and corners, especially where thermal expansion has stressed the original fabrication. We repair galvanized trunk lines with proper sheet-metal patches, sealed with mastic and mechanically fastened — not duct tape, not foil patches that peel in humidity. For rusted sections in damp Hollis basements, we replace with new galvanized or insulated duct as appropriate.
Duct Insulation
Uninsulated or degraded duct in crawlspaces and attics loses 20–30% of conditioned air before it reaches your rooms. In Hollis, where heating season stretches from October through April, that’s six months of paying to warm your crawlspace. We reinsulate with proper R-value materials, vapor-barriered where moisture is present, and sealed at every penetration. For homes with wood-burning fireplaces — common in Hollis’s rural custom builds — proper insulation also reduces the migration of combustion particulates into return-air pathways.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Hollis
We don’t show up guessing. Our equipment roster includes Rotobrush and Nikro platforms for mechanical cleaning and access, plus Abatement Technologies HEPA systems for containment when we’re dealing with rodent debris or heavy organic buildup. For air quality integration after repair and sealing, we work with Honeywell and Aprilaire components — the same brands you’d find in commercial installations, specified for Hollis homes that need more than a basic patch job. We carry common flex-duct diameters, mastic, and insulation materials on every truck, so most Hollis repairs don’t wait on parts.
Common Duct Repair & Sealing Problems We See in Hollis Homes
- Rodent-damaged flex duct at basement and crawlspace connections. Hollis’s wooded 2–5 acre lots support dense mouse and squirrel populations. These animals chew through flex-duct plastic and fiberglass to access warm airflow, creating leaks that drop system pressure and introduce biohazard debris. We address this with HEPA-contained removal, sanitizing, and properly sealed replacement.
- Failed original duct tape on 1980s–1990s installations. The cloth-backed adhesive used in Hollis’s building boom years turns brittle and falls away, leaving metal seams and flex connections openly leaking. We find this in nearly every un-serviced home from that era — the tape literally crumbles to the touch.
- DIY mastic peeling off unprepped galvanized duct. Self-reliant Hollis homeowners often attempt their own sealing, but without proper degreasing and surface prep, mastic won’t bond to galvanized metal in damp basement conditions. We strip the failed application and redo it correctly.
- Long trunk runs with multiple leaks causing zone imbalance. Hollis’s sprawling homes have significantly more linear duct footage than comparable homes in denser towns like Nashua. When leaks accumulate along a 40-foot main trunk, upstairs zones starve for airflow while the basement pressurizes. Sealing requires systematic pressure-testing and methodical repair.
Pricing for Duct Repair & Sealing in Hollis, NH
Here’s what duct repair and sealing costs in Hollis’s market:
| Service | Typical Range in Hollis |
|---|---|
| Single flex-duct section replacement (including biohazard remediation) | $280–$420 |
| Mastic sealing of accessible metal trunk (per 20 linear feet) | $180–$290 |
| Full crawlspace duct insulation replacement | $340–$550 |
| Multi-zone system pressure test and comprehensive sealing | $480–$650 |
Costs run higher in Hollis than in denser towns for straightforward reasons: more linear footage per home, more crawlspace work, and the frequent need for biohazard remediation before standard sealing can begin. A Nashua ranch with 80 feet of duct is a different job than a Hollis colonial with 180 feet and squirrel damage. We don’t quote over the phone without seeing your system — but we don’t charge for the estimate, either. Call (877) 517-5646 and Thomas will walk through what you’re experiencing and what to expect.
We Also Serve Cities Near Hollis
Our service area extends throughout southern New Hampshire. We regularly handle duct repair and sealing in Nashua — where denser housing stock means shorter runs and different failure modes — plus Milford, Hudson, and Merrimack. The equipment and expertise we bring to Hollis’s rural acreage homes translates directly to these neighboring communities, though each town’s housing stock and duct configurations present their own patterns.
Serving Hollis, NH — Our Local Coverage Area
We’re based in the Hollis 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 — Duct Repair & Sealing in Hollis
Hollis’s large wooded lots and agricultural surroundings — including working orchards — support dense rodent populations that seek warm shelter in winter. Flex-duct connections in basements and crawlspaces provide easy entry points, and the plastic liner and fiberglass insulation are readily chewed for nesting material. If you’re in a Hollis home surrounded by woodland, we recommend inspecting accessible flex runs annually. Call (877) 517-5646 to schedule — estimates are free.
Yes, and possibly more urgently than your main house. Detached workshops in Hollis often have minimal insulation, greater temperature swings, and duct runs that see less maintenance — meaning leaks go unnoticed longer. Unsealed workshop duct wastes fuel and can create condensation issues that accelerate metal deterioration. We’ll pressure-test both systems and prioritize based on leakage rates. Call (877) 517-5646 for an assessment.
Hollis’s active agricultural land, including working orchards, generates unusually high pollen and leaf-mold spore loads that accumulate in duct systems over time. This organic debris holds moisture, promotes microbial growth, and can clog filters and coils — masking underlying leaks because the system is already struggling. We typically clean and sanitize before sealing, so we’re not trapping contaminants behind new mastic. The combination of rural debris and rodent biohazard makes Hollis duct work genuinely specialized.
We remove all failed tape residue, mechanically clean the metal surface, and apply fiber-reinforced mastic sealant — a brush-on compound that cures flexible and airtight. Unlike tape, mastic won’t degrade with temperature cycling or peel in damp basement conditions common in Hollis’s rural homes. For flex-duct connections, we add proper mechanical supports and sealed collars, not just adhesive. The result lasts decades, not years.
Sometimes, but not always — and we won’t promise what we can’t deliver. In Hollis’s many insulated crawlspaces, we first locate leaks with pressure testing and infrared inspection to minimize disruption. Small accessible leaks can be sealed through strategic access points. Larger damage, especially rodent-chewed flex, requires removing insulation to access and properly repair the duct, then reinstalling insulation correctly. We’ll show you exactly what we’re dealing with before cutting anything. Call (877) 517-5646 and we’ll walk you through the specific approach for your crawlspace.
Ready to stop heating your basement and start heating your rooms? Thomas Hernandez personally handles every Hollis duct repair and sealing job, with 14 years of specialized experience and equipment most residential crews don’t carry. Call (877) 517-5646 for a free estimate — we’ll give you straight answers about what’s leaking, what it’ll take to fix, and what it’ll cost.
Written by Thomas Hernandez, Owner at Titan Air Duct Cleaning Lowell, serving Hollis since 2010.