Duct Sealing in Old Greenwich - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Old Greenwich

If you’re paying to heat rooms that never get warm, or your upstairs stays stubbornly cold while the furnace runs nonstop, you probably have leaky ducts. In Old Greenwich, where most homes were built before 1950 with unlined metal ductwork and retrofitted HVAC systems, conditioned air escapes into walls, basements, and crawl spaces before it ever reaches your vents. Hollis Air Duct Cleaning has sealed duct systems across Old Greenwich since 2004, and our crews know the quirks of coastal Connecticut’s pre-war housing stock. Call (361) 326-5060 for a free estimate. We’ll show up in the window we promised, price the job in writing before touching anything, and back it with our 365-Day Done Right Promise.

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Why Hollis Air Duct Cleaning Is Old Greenwich’s Preferred Duct Sealing Company

We’ve worked in the Colonials along Shore Road, the capes near Binney Park, and the estate properties backing up to Long Island Sound. That repetition matters. Our technicians have handled asbestos-wrapped ducts in Old Greenwich homes enough times to know exactly how to test, seal, and protect fragile materials without creating a contamination risk.

Our scheduling runs through our Hartford office, but the crews serving Old Greenwich are local. They know which streets flood in spring tides, which basements stay damp year-round, and how that humidity attacks duct seams from the outside in.

Roy Castellanos built this operation on The Garrison Standard: written prices, written guarantees, and technicians who arrive uniformed, background-checked, and accountable. No estimate balloons once we’re inside. No voicemail loops when you call. A live person answers the phone 24 hours a day, 7 days a week.

The 365-Day Done Right Promise covers every duct sealing job we do in Old Greenwich. If the seal fails within a year, we come back and make it right at no charge, including a free second visit. That guarantee is in writing on every invoice.

Air Duct Sealing in Old Greenwich

Air Duct Sealing in Old Greenwich means closing the gaps, seams, and disconnected joints in your forced-air system so the heat you pay for actually reaches your rooms. Most homeowners call us after noticing uneven temperatures, dust pouring from registers, or utility bills that climbed without explanation. In this market, a typical whole-house duct sealing job runs $1,200 – $2,800 depending on system size, accessibility, and whether we encounter asbestos-wrapped ducts requiring additional containment per Connecticut DPH regulations.

How We Find the Leaks

We pressurize your duct system and use a calibrated fan to measure airflow loss, then trace every cubic foot of escaping air to its source. In Old Greenwich homes with mixed old and renovated ductwork, we often find previous contractors left new sections poorly joined to original runs. We mark every leak before sealing anything, and we show you the map.

What We Seal With

Our crews use duct sealing mastic, a thick, fiber-reinforced compound that remains flexible after curing, plus mechanical fasteners where joints carry stress. For accessible ducts in basements or crawl spaces, we may apply aerosol-based sealant that finds leaks we can’t reach by hand. We carry professional-grade equipment from Abatement Technologies and Guardsman, the same filtration and containment brands commercial crews use.

Duct Sealing Services in Old Greenwich

Duct Sealing Services in Old Greenwich address a specific problem set created by this area’s housing stock and coastal climate. Humid summers and cold, damp winters expand and contract metal duct seams until they loosen. Salt air from Long Island Sound accelerates corrosion at joints. Pollen and mold spores drawn through gaps foul your indoor air. We seal the envelope so your HVAC system can do its job without fighting itself.

Asbestos-Aware Sealing Protocol

Many Old Greenwich homes still have original asbestos-wrapped ducts. Our technicians test before disturbing anything, then seal using methods that don’t require cutting or abrading fragile insulation. If containment is necessary, we follow Connecticut DPH regulations precisely. This adds time and cost, but skipping it is not an option for responsible work in this town.

Post-Sealing Verification

We retest airflow after sealing to prove the improvement. You’ll see before-and-after pressure readings on your invoice. We also photograph accessible work so you have visual confirmation of what was sealed. This documentation supports the 365-Day Done Right Promise if any issue arises later.

Trusted Brands We Service in Old Greenwich

Hollis technicians work with professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, and Guardsman. For Old Greenwich customers, this means we stock the mastics, tapes, and mechanical fasteners suited to your older duct materials, not just modern flex-duct solutions. When a sealing job requires filtration upgrades afterward, we carry Honeywell and Aprilaire products sized to your system. Because our Hartford office maintains inventory for the coastal Connecticut market, we rarely wait on parts. Most duct sealing jobs in Old Greenwich start and finish same-day once scheduled.

Common Duct Sealing Problems We See in Old Greenwich Homes

• Disconnected flex-duct additions in renovated capes. Homeowners near Tomac Avenue often find that a 1980s or 1990s renovation added flex duct to original metal trunk lines, and the connection points have sagged or pulled apart. We reconnect and seal with proper supports so the joint holds.
• Corroded seams in basement trunk lines. Cold, damp basement air in Old Greenwich basements condenses on metal ducts, especially where they run near foundation walls. Over decades, this rusts the seam sealant away. We clean, treat, and reseal these runs with moisture-resistant mastic.
• Leaky returns drawing attic air. In pre-1950 Colonials with retrofitted central air, return ducts sometimes run through unconditioned attics. Gaps pull in summer heat and winter cold, wasting energy and introducing dust. We seal accessible sections and recommend insulation where appropriate.
• Asbestos-wrapped ducts with deteriorating outer layers. The distinctive hook in Old Greenwich is original asbestos insulation that crumbles when touched. Our technicians test, contain, and seal without disturbing the hazardous material, following state protocols that protect your home and our crew.

Pricing for Duct Sealing in Old Greenwich, CT

We Also Serve Cities Near Old Greenwich

Our crews travel throughout lower Fairfield County. We regularly handle Duct Sealing calls from Riverside, Cos Cob, Stamford, and Greenwich, often scheduling multiple jobs in the same day to keep routes efficient. If you live near the border, we’ll confirm your address against our service map when you call. We also provide Air Duct Cleaning in Old Greenwich and Dryer Vent Cleaning in Old Greenwich for homeowners who want their full system handled in one visit.

FAQs About Duct Sealing in Old Greenwich