Duct Sealing in Lexington - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Lexington

We’re the crew Hollis Air Duct Cleaning sends to Lexington when homeowners call about rooms that never heat evenly, utility bills that climb for no clear reason, or the musty smell that kicks in every time the system cycles. Our Duct Sealing team knows the town’s housing stock from the 18th-century colonials around Battle Green to the mid-century ranches off Woburn Street, and we price every job in writing before we touch a tool. If your ducts are leaking conditioned air into walls, attics, or the crawl spaces beneath these old floors, you’re paying to heat and cool spaces you don’t live in. Call (361) 326-5060 and we’ll get you a free estimate, usually scheduled within a few days.

Call (361) 326-5060

Why Hollis Air Duct Cleaning Is Lexington’s Preferred Duct Sealing Company

We’ve been working in Lexington long enough to know that a ranch on Spring Street and a colonial on Hancock Street present entirely different duct problems. Our technicians are background-checked, uniformed, and trained to The Garrison Code: arrive inside the quoted window, price in writing, complete the job by the book, and leave the site clean. Every repair we make carries our 365-Day Done Right Promise in writing. If the seal fails or the airflow problem returns within a year, we come back at no charge, including a free second visit. Phones are answered by a live person 24 hours a day, 7 days a week, and scheduling is coordinated from our Boston office with crews dispatched locally to Lexington and surrounding towns.

Duct Insulation in Lexington

Duct Insulation in Lexington addresses a specific problem created by the town’s climate and construction history: unconditioned spaces where metal ductwork loses heat in winter and gains it in summer, forcing your HVAC system to run longer and harder. For related vent maintenance, see our Lexington Dryer Vent Cleaning service. In Lexington’s older homes, particularly the colonials and capes built before modern energy codes, we frequently find bare galvanized ducts running through uninsulated attics, damp basements, and the tight chases between walls where plaster and lath were never meant to contain mechanical systems. A typical duct insulation job in Lexington runs $450 – $850 depending on accessible linear footage and whether we’re working alongside sealing or cleaning.

Attic and Basement Runs

These are the priority targets in Lexington. Attic temperatures in January can sit below freezing for weeks; basement humidity in July climbs fast. We wrap accessible ducts with formaldehyde-free fiberglass insulation, sealed at seams, to bring surface temperatures closer to the air moving inside.

Chase and Cavity Work

In historic homes, ducts sometimes travel through original chimney flues or framed chases. Where we can’t access the full run, we insulate what we can reach and seal the remainder, prioritizing the sections where temperature loss is measurable.

HVAC Duct Sealing in Lexington

HVAC Duct Sealing in Lexington is often the single most cost-effective upgrade a homeowner can make, especially in houses where decades of thermal cycling have loosened joints, cracked mastic, or collapsed flexible connections. The Department of Energy estimates typical homes lose 20 – 30% of conditioned air through duct leaks; in Lexington’s older housing stock, with original galvanized or early copper ductwork, we’ve measured losses above 40% in homes where joints have simply separated inside walls. A standard residential duct sealing job in Lexington typically costs $650 – $1,400, with larger homes or multi-zone systems running toward the higher end.

Mastic and Tape Methods

We apply water-based duct mastic to joints and seams, reinforced with fiberglass mesh where gaps exceed 1/8 inch. For accessible connections, foil-backed tape rated for HVAC use supplements the seal. This is slow work done by hand, not spray foam in a can.

Pressure Testing and Verification

Before we leave, we run a duct blaster or static pressure test to measure improvement. You see the numbers. We don’t guess, and we don’t call it done until the leakage rate drops to where it should be for your system’s design.

Trusted Brands We Service in Lexington

Our vans carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and we stock filtration and sealing products from Honeywell, Aprilaire, and Guardsman. For Lexington homeowners, this means we’re not ordering parts from a warehouse three states away and waiting a week. When we find a crushed flex duct behind a wall in a Follen Hill cape or a failed connection in a Lexington Heights ranch, we typically have what we need to complete the repair that day. The tools we use are the same ones commercial crews deploy in hospitals and schools, maintained on schedule and operated by technicians who can explain what each piece does and why we’re using it on your system.

Common Duct Sealing Problems We See in Lexington Homes

• Disconnected joints in original galvanized ductwork. Lexington’s 1950s – 70s ranches and capes often still have their original metal ducts. Decades of thermal expansion and contraction loosen the slip joints. We find separations of an inch or more, dumping heated air into wall cavities.
• Crushed or kinked flexible returns in retrofit installations. In the Battle Green area and other historic districts, flexible duct was sometimes forced through chases too small for it. The restriction starves the system of return air and drives up static pressure.
• Failed sealant from organic debris contamination. Lexington’s heavy oak and maple canopy produces pollen, leaf litter, and seed pods that enter ductwork through gaps. Previous sealers sometimes applied mastic over this debris; it fails within seasons as the organic material degrades underneath.
• Condensation damage in unconditioned basements. Summer humidity in Lexington basements runs high. Cold supply ducts sweat, rusting metal and dissolving old tape adhesives. We seal and insulate together to break the condensation cycle.

Pricing for Duct Sealing in Lexington, MA

We Also Serve Cities Near Lexington

Our crews work throughout the Route 128 corridor and beyond. We regularly schedule Duct Sealing in Lexington alongside jobs in Woburn, Winchester, Burlington, and Arlington. If you’re in one of these neighboring towns and found this page, the same pricing structure and 365-Day Done Right Promise apply.

FAQs About Duct Sealing in Lexington