Duct Sealing in Severn - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Severn

Duct sealing in Severn typically runs $450 – $1,200 for a whole-house seal, depending on whether we’re patching accessible joints or chasing down disconnected runs in a crawl space or attic. Most Severn jobs take a half day to a full day, and we give you a written price before we start.

Call (361) 326-5060

We’ve worked in Severn long enough to know the patterns. The post-WWII capes near the older commercial corridors. The 1980s and 1990s colonials in Berrywood and Stillmeadows with flex duct that doesn’t age well. The split-levels off Telegraph Road with original galvanized runs in damp crawl spaces. Our Duct Sealing team dispatches from our Baltimore office, and we’re familiar with the county inspection requirements and the way Severn’s humidity and pollen loads stress HVAC systems year-round. When you call (361) 326-5060, a live person answers, and we’ll schedule a free estimate at your Severn home.

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

Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. We’ve built our reputation in Anne Arundel County by showing up inside the window, pricing in writing, and leaving the site clean. That’s The Garrison Standard, and it applies to every Duct Sealing in Severn job we take.

Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. We carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and we use Honeywell and Aprilaire filtration products when the job calls for them. Every repair is covered by our 365-Day Done Right Promise: if the work fails within a year, we come back and make it right at no charge, including a free second visit.

We don’t compete on teaser prices. We compete on discipline. The price we write down before any work starts is the price you pay. No ballooning at the door.

Duct Repair in Severn

Duct Repair in Severn often starts with a homeowner noticing weak airflow to one room, dust streaking around registers, or a utility bill that climbed without explanation. In this market, the culprits are usually original galvanized ductwork in mid-century ranches that’s corroded or separated at the joints, or flex-duct runs in 1980s and 1990s additions that have been crushed by storage items in attics or disconnected at takeoffs by decades of vibration. A typical duct repair in Severn runs $280 – $650 for reconnecting and supporting a damaged run, or $400 – $900 if we need to replace a section of flex duct and seal the surrounding joints. We always inspect with a camera before quoting, so you’re not paying for sealing when the real problem is a broken run.

Reconnecting Crushed Flex Runs

Flex duct is common in Severn’s Berrywood and Stillmeadows additions because it installs fast and costs less than hard pipe. But it’s also easily crushed by a homeowner storing holiday decorations on it, or by a contractor stepping in the wrong place in an attic. We locate the damage with a camera, reconnect the run with proper support straps, and then seal the joints. Without that support, the same crush happens again in two years.

Galvanized Duct Corrosion in Crawl Spaces

The older ranches and split-levels near Severna Park often have galvanized supply lines sitting in damp crawl spaces. The metal corrodes at the seams, and the joints work loose as the duct expands and contracts with each heating and cooling cycle. We replace what can’t be saved and seal what can with mastic and mesh, which flexes with the metal instead of cracking like tape.

Air Duct Sealing in Severn

Air Duct Sealing in Severn is the step that comes after repair, or the standalone fix when your ductwork is physically intact but leaking conditioned air into attics, crawl spaces, or wall cavities. The Department of Energy estimates the typical home loses 20 – 30% of heated and cooled air through duct leaks. In Severn, where summers are humid and winters are cold enough to run heat steadily, that loss shows up in your BGE bill. A whole-house air duct sealing in Severn runs $450 – $1,200, with simpler jobs on accessible basement systems at the lower end and crawl-space or attic work with multiple plenum leaks toward the higher end. We use mastic and fiberglass mesh on metal ducts, and proper collar seals on flex connections.

Mastic vs. Tape Sealing

We don’t use duct tape for duct sealing, despite the name. The adhesive fails within a season in Severn’s humidity. We use water-based duct mastic, brushed or sprayed onto joints and covered with mesh for reinforcement. It cures to a flexible, permanent seal that moves with the duct through temperature swings. On galvanized joints in older Severn homes, this is the only method that lasts.

Air Handler and Plenum Sealing

The worst pressure losses in a duct system usually happen at the air handler cabinet and the supply plenum, not the distant runs. In Severn’s 1990s colonials, we’ve found plenums with gaps large enough to slide a hand through, blowing conditioned air directly into the attic. We seal these with high-temperature mastic and metal-backed tape rated for the heat, then verify with a pressure test.

Trusted Brands We Service in Severn

We stock parts and materials from Honeywell, Aprilaire, and Abatement Technologies for our Severn customers, which means most repairs don’t wait on a warehouse order. Honeywell and Aprilaire filtration upgrades integrate directly with sealed duct systems to maintain the pressure balance we’ve restored. Abatement Technologies supplies the containment and negative-air equipment we use when a job requires cutting into ductwork or working in a confined attic. For the sealing work itself, we source professional-grade mastic, mesh, and mechanical fasteners that match what commercial HVAC crews use, not the hardware-store tape rolls that fail in Maryland humidity. If your system uses specialized components, we’ll tell you before we start whether we need to order, and we’ll build that into the written price.

Common Duct Sealing Problems We See in Severn Homes

• Crushed flex duct in Berrywood and Stillmeadows attics. The 1980s and 1990s additions in these neighborhoods used flex duct for speed and cost savings. Decades of storage traffic and summer heat have collapsed runs or pulled them loose at takeoffs. Sealing over these breaks without reconnecting them first traps the problem and wastes your money.
• Disconnected returns in split-level crawl spaces. Severn’s mid-century split-levels often have return ducts running through damp crawl spaces near the Patapsco River floodplain. The joints corrode and separate, pulling musty crawl-space air into your living space instead of recirculating indoor air. We reconnect and seal, then verify with a smoke pencil.
• Plenum gaps at the air handler in newer colonials. Even well-built 2000s homes in Severn sometimes have builder-grade plenum seals that fail within ten years. The gap is hidden in the attic, so the homeowner only notices the symptom: a bedroom that never gets warm in January or cool in July.
• Tape-only seals on original galvanized joints. Previous owners or handymen often wrapped failing joints with foil tape as a quick fix. The adhesive degrades in Severn’s humidity, and the metal underneath continues to flex and leak. We strip the tape, clean the metal, and apply mastic and mesh for a permanent seal.

Pricing for Duct Sealing in Severn, MD

We Also Serve Cities Near Severn

Our crews work throughout central Anne Arundel and Howard counties. We regularly schedule Severn alongside jobs in Odenton, Jessup, Gambrills, and Elkridge, which keeps our routing efficient and our appointment windows reliable for customers in all five communities.

FAQs About Duct Sealing in Severn