Duct Sealing in New Haven - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across New Haven

Duct sealing in New Haven typically runs $450 – $1,200 for a whole-home job, depending on how much of your system needs work and whether we find disconnected or corroded runs behind the walls. Most New Haven homes we seal are done in a single day, with the price written down before we touch a tool.

Call (361) 326-5060

We’re the Duct Sealing in New Haven crew from Hollis Air Duct Cleaning, and we’ve been driving to jobs in Wooster Square, Westville, and Fair Haven Heights long enough to know what waits inside these walls. Our dispatch team works out of Hartford, but our vans roll into New Haven every morning with Rotobrush gear, Guardsman mastic, and technicians who’ve already pulled apart duct systems in 19th-century three-deckers, 1950s ranches, and every brick rowhouse in between. Roy Castellanos built this operation on The Garrison Standard: arrive inside the window, price it in writing, leave the site clean. That standard travels with us down I-91 and into your basement. Call (361) 326-5060 when you’re ready to stop heating your crawlspace and start heating your bedrooms.

Why Hollis Air Duct Cleaning Is New Haven’s Preferred Duct Sealing Company

We’ve been in business since 2004 as part of the Garrison Partners family, and our track record predates most of the duct cleaning outfits currently advertising in New Haven. That longevity matters because duct sealing in this city isn’t a generic job. The 365-Day Done Right Promise covers every seal we apply: if a joint opens, a mastic patch fails, or airflow drops where we worked, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.

Our technicians are background-checked and uniformed, and we send you their name and photo before they arrive. The price is written down before any work starts, and it does not move at the door. Phones are answered by a live person 24 hours a day, 7 days a week, so when you call about a drafty second floor in East Rock or a musty basement in Fair Haven, you talk to a human who can schedule you, not a voicemail loop.

We carry professional-grade equipment from Nikro, Rotobrush, and Abatement Technologies, plus filtration products from Honeywell and Aprilaire. These are the same tools commercial crews use on hospitals and schools, and we explain what each one does while it’s running in your home.

Duct Insulation in New Haven

Duct Insulation in New Haven addresses a problem most homeowners don’t discover until winter: the uninsulated galvanized runs in your attic or crawlspace are bleeding heat into spaces that don’t need it, while cold air infiltrates the return side and forces your furnace to run longer. In New Haven’s housing stock, particularly the 1920s-40s bungalows in Westville and the 1950s-60s ranches in West Rock, original ductwork was often installed without insulation because fuel was cheap and builders didn’t prioritize efficiency. Today, with winter temperatures regularly dropping below 20°F and summer humidity pushing 80%, those bare metal ducts are a year-round energy drain. A typical duct insulation job in New Haven runs $600 – $1,400, depending on linear footage and whether we need to remove degraded old wrap first.

When bare metal becomes a liability

Uninsulated ducts in New Haven’s cold attics and humid crawlspaces create condensation that rusts seams from the inside out. We’ve opened ceiling panels in West Rock ranches to find galvanized returns so corroded that insulation alone won’t save them; the metal needs sealing first, then wrapping with R-6 or R-8 fiberglass duct insulation held by mechanical fasteners and vapor-barrier tape. Without that sequence, you’re wrapping a leak.

What we use and why it matters

We install insulation products from Abatement Technologies and Guardsman, matched to your duct material and the local conditions. In below-grade New Haven basements where foundation vents get blocked by snow or landscaping, we use closed-cell foam-backed wraps that resist moisture absorption better than standard fiberglass. The goal is simple: the air you paid to heat or cool arrives at the register at the temperature your thermostat requested.

HVAC Duct Sealing in New Haven

HVAC Duct Sealing in New Haven is the repair that fixes what years of patchwork renovations, tenant turnover, and coastal humidity have broken. Most homeowners call us because one room won’t hold temperature, the basement smells musty when the system runs, or their energy bill climbed without explanation. In New Haven’s older homes, especially the three-deckers in East Rock and the brick rowhouses in Wooster Square, we regularly find supply and return ducts that were retrofitted in the 1950s-70s with cheap galvanized metal, then modified again by landlords who crammed flex duct through walls never designed for it. A typical HVAC duct sealing job in New Haven runs $450 – $1,200, with whole-system resealing at the higher end and targeted joint repair at the lower.

The coal-dust problem no one talks about

In East Rock and Fair Haven Heights, duct runs inside 19th-century three-deckers still carry coal-dust and soot residue from original gravity furnaces. That residue breaks the bond of brush-on and mastic duct sealants. Airtightness only holds once that material is removed to NADCA standards. We see crews skip this step, slap mastic over black dust, and walk away. Six months later, the homeowner calls us to do it properly.

Crushed flex and disconnected runs

Westville and West Rock ranches with undersized trunk lines often have flex-duct retrofits crushed at tight corners or disconnected by careless between-tenant renovations. Sealant applied over a crushed run just hides the airflow loss. Our Duct Sealing team tests static pressure before and after, so we know whether we’re fixing a leak or replacing a destroyed section.

Trusted Brands We Service in New Haven

We seal and repair duct systems built with components from Honeywell, Aprilaire, Nikro, and Abatement Technologies, and we stock local parts for New Haven customers so turnaround stays fast. Honeywell media air cleaners and Aprilaire whole-house humidifiers integrate directly into the ductwork we seal, which means we can address filtration and moisture control while we’re already inside your system. Nikro negative-air machines and Abatement Technologies HEPA equipment let us maintain containment during source removal in older homes where asbestos tape or degraded duct liner is a concern. We don’t sell brand names; we match the right component to what your house actually needs.

Common Duct Sealing Problems We See in New Haven Homes

• Coal-dust residue prevents sealant bonding. In East Rock three-deckers, decades of accumulated soot from original gravity furnaces coat the interior of supply runs. Brush-on sealants and mastic need clean metal or bare duct board to adhere. We remove this residue with Rotobrush agitation and negative-air extraction before any sealing begins.
• Humid summers rust galvanized returns in rowhouse basements. Fair Haven and Wooster Square homes with below-grade duct runs see moisture pushed into uninsulated metal every July and August. Rust flakes off at the seams, and previous sealant applications peel away. We wire-brush to bare metal, treat with rust inhibitor, then seal with Guardsman mastic rated for wet locations.
• Tree canopy clogs outdoor intakes, causing freeze-ups that stress duct joints. New Haven’s street-tree program fills high side-wall vents with elm and maple seeds before they drop through to the blower. Restricted airflow makes the evaporator coil ice over, pressure spikes split weak seams, and the cycle repeats until the intake is cleared and the damaged joints are sealed.
• Student-rental flex duct gets crushed and hidden. Near Yale and in multi-family conversions throughout downtown, we’ve found flex runs flattened behind drywall or disconnected at the collar by renovators who never planned to live with the system. Sealing the visible joints while a crushed run suffocates a bedroom is wasted work. We pressure-test every branch before we seal.

Pricing for Duct Sealing in New Haven, CT

We Also Serve Cities Near New Haven

Our crews work throughout the New Haven metro, including New Haven proper plus East Haven, West Haven, Orange, and North Haven. The same written pricing, same 365-Day Done Right Promise, same background-checked technicians in every town.

FAQs About Duct Sealing in New Haven