Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Duct Sealing Across Crofton
Duct sealing in Crofton typically runs $450 – $1,200 for a whole-house seal on original 1960s-70s rigid metal systems, and most jobs are scheduled within a few days of your call. We’re familiar with the split-levels along Crofton Parkway and the colonials near the Country Club, and our crews dispatch from our Baltimore office to reach Crofton homeowners without the wait you’d get from outfits based farther out. Call (361) 326-5060 for a free estimate.
Crofton’s housing stock is specific. The split-levels and colonials built in the 1960s and 1970s came with unsealed rigid metal trunk lines and branch runs. Decades of thermal cycling have opened seams that were never airtight to begin with. Meanwhile, the mature oak canopy that makes Crofton distinctive drops acorns and leaves into exterior vent terminations, adding debris loads to those same original runs. Our Duct Sealing team treats this as a system restoration, not a quick patch.
Why Hollis Air Duct Cleaning Is Crofton’s Preferred Duct Sealing Company
We’ve worked on enough Crofton homes to know what the original ductwork looks like before we open the access panel. The rigid metal systems in neighborhoods like Crofton Meadows and the streets off Route 3 have specific failure patterns: seams at the trunk-to-branch connections, disconnected runs in wall cavities, and flex duct added during attic conversions that sags and leaks at the fittings.
Our technicians are background-checked and uniformed, and they arrive inside the quoted window. The price is written down before any work starts, and it does not move at the door. Every repair is backed by our 365-Day Done Right Promise: if the work fails within a year, we return and make it right at no charge, including a free second visit. Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues.
We coordinate dispatch from our Baltimore office, but the crew that arrives at your Crofton home knows the local housing stock. They’ve sealed ducts in split-levels off Conway Road and colonials near the Waugh Chapel Towne Centre. That local familiarity means less time diagnosing and more time fixing.
Duct Sealing Services in Crofton
Duct Sealing Services in Crofton address the original unsealed rigid metal duct systems found in most local homes, restoring design pressure so conditioned air reaches the registers instead of leaking into wall cavities, attics, and crawlspaces. A typical whole-house seal in Crofton runs $450 – $1,200 depending on system size, accessibility, and whether we find disconnected runs that need reconnection. Most Crofton homeowners schedule this after noticing uneven temperatures between floors, musty odors, or utility bills that climb without explanation.
Leak Detection and Pressure Testing
We start with a pressure test to quantify how much air your system is losing. On a 1968 split-level off Crofton Parkway, our tech ran a camera inspection through the original rigid metal supply and return ducts and found the branch run to the upstairs bedrooms disconnected at a fitting, bleeding conditioned air into a wall cavity. After source removal with agitation tools under negative pressure, we resealed the joints and reconnected the run, restoring proper airflow to the second-floor registers and dropping the musty odor in the primary bedroom. The pressure test gives us a baseline so you know the improvement in hard numbers.
Mastic Sealing and Joint Restoration
We seal with mastic, a water-based compound that remains flexible after curing, unlike tape that dries and cracks. On original Crofton metal ductwork, we brush mastic into every longitudinal seam, transverse joint, and fitting connection. Where flex duct was added during later conversions, we seal the collar connections and support the run to prevent sag. The goal is a system that holds its design static pressure from the air handler to the farthest register.
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.
Duct Insulation in Crofton
Duct Insulation in Crofton addresses the condensation and energy loss that occur when uninsulated metal ducts run through humid attics and crawlspaces, or when added flex duct lacks adequate R-value for our climate. In Crofton’s humid subtropical summers, cold supply air meeting 140-degree attic temperatures creates condensation on duct surfaces. That moisture feeds mold growth and drips onto insulation and ceiling drywall. A typical duct insulation job in Crofton runs $600 – $1,800 depending on linear feet and accessibility.
Attic and Crawlspace Wrap
We wrap accessible rigid metal ducts with formaldehyde-free fiberglass insulation, sealed with a vapor barrier jacket. In Crofton’s older homes, the original ductwork often has no insulation at all, or the wrap installed in the 1970s has compressed and degraded. We remove the old material, clean the duct surface, and install new insulation rated for the temperature differential in your specific space. This stops the condensation that causes musty odors and ceiling stains.
Flex Duct Replacement and Upgrade
Flex duct added during attic or basement conversions in Crofton homes often sags, collects debris at low points, and lacks the insulation value of modern product. We replace deteriorated flex with properly supported, insulated runs using connections that maintain airflow. Where the original rigid metal is sound, we leave it in place and seal it; where flex has been crushed or torn by rodents, we replace it with material that matches the system’s design.
Trusted Brands We Service in Crofton
Our equipment roster includes Rotobrush rotary brush systems for agitation cleaning inside rigid metal ducts, Nikro negative-air machines that maintain containment during source removal, and filtration and sealing products from Aprilaire, Abatement Technologies, and Guardsman. We stock mastic, collars, and insulation materials locally so we’re not waiting on shipments to finish your Crofton job. That means a crew that arrives with what they need, completes the work in the scheduled window, and leaves the site clean. The Garrison Standard requires it.
Common Duct Sealing Problems We See in Crofton Homes
- Original rigid metal seams leak at every joint after decades of thermal cycling. The 1960s-70s split-levels and colonials throughout Crofton were built with unsealed trunk lines and branch runs. Expansion in summer, contraction in winter, and the vibration of the air handler have opened gaps that were never mastic-sealed from the factory. The system loses pressure before air ever reaches the registers on the far end of the split-level.
- Acorns and oak leaves pack into exterior vent terminations and the first few feet of duct. Crofton’s mature oak canopy is beautiful, but it drops debris directly into wall caps and roof jacks. Sealing over that blockage without removing it traps the obstruction and can create a fire hazard near the furnace. We clear the debris first, then seal.
- Attic and basement flex duct added during later conversions sags and collects debris at fittings. The low spots hold moisture from our humid summers, and the connections to the original metal trunk leak at the collar. Sealing those connections without correcting the sag leaves a low spot that re-accumulates moisture and mold.
- Disconnected branch runs bleed conditioned air into wall cavities and floor chases. Thermal cycling and the weight of accumulated debris separate flex from metal fittings, or crack the sealant on rigid connections. The homeowner feels it as a room that never heats or cools properly, or a musty smell where moist unconditioned air is drawn into the cavity.
Pricing for Duct Sealing in Crofton, MD
A typical whole-house duct sealing in Crofton runs $450 – $1,200. Duct insulation runs $600 – $1,800. Combined sealing and insulation on a full split-level system typically falls between $900 and $2,400.
| Service | Crofton Price Range |
|---|---|
| Whole-house duct sealing (rigid metal) | $450 – $1,200 |
| Duct insulation (attic/crawlspace wrap) | $600 – $1,800 |
| Combined sealing + insulation | $900 – $2,400 |
| Disconnected run reconnection (per run) | $150 – $400 |
What moves the number: system size (a 1,200-square-foot colonial has less duct than a 2,400-square-foot split-level), accessibility (crawlspace work takes longer than basement work), and whether we find disconnected runs or damaged flex that needs replacement. We give you a written price before any work starts, and that price does not move at the door. No per-vent pricing, no add-ons once the technician is inside. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Crofton
Our crews work throughout Anne Arundel County, including Duct Sealing in Crofton and surrounding communities: Gambrills to the south, Odenton to the west, Crownsville to the east, and Riva along the South River. Same written pricing, same 365-Day Done Right Promise, same background-checked technicians at every address.
Serving Crofton, MD - Our Local Coverage Area
We’re based in the Crofton 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 About Duct Sealing in Crofton
Crofton’s 1960s-70s split-levels and colonials were built with unsealed rigid metal trunk lines and branch runs, so the seams that leak now are original to the house. Newer construction uses sealed ductboard or pre-sealed flex with mastic at the factory. In Crofton, duct sealing is often restoring the distribution system’s design pressure rather than fixing a single failed joint. Call (361) 326-5060 for an exact quote on your system.
We run a pressure test that measures static pressure loss across the system, and we use a borescope camera to inspect joints and fittings from the inside. Dirty ducts restrict airflow but maintain pressure; leaking ducts lose pressure at the seams. The camera shows us whether the debris is the primary problem or whether we’re also looking at disconnected runs and open joints. We’ll show you the footage and explain what it means before we recommend any work.
No, and we won’t try. Sealing over a blockage traps the debris and can create a fire hazard near the furnace. We remove the obstruction first using agitation tools under negative pressure, then inspect the duct for damage, then seal. On Crofton homes with oak-canopy debris loads, the cleaning and sealing are typically done as a single job with one written price.
Yes, often significantly. The musty smell in Crofton homes usually comes from two sources: condensation on uninsulated metal ducts in humid attics and crawlspaces, and return leaks that draw moist, moldy air from wall cavities and crawlspaces into the system. Sealing the supply leaks restores pressure; sealing the return leaks stops the infiltration of unconditioned, contaminated air. We address insulation separately if condensation is the primary driver.
Sealing closes the gaps where air leaks out or in; insulation slows heat transfer and prevents condensation on the duct surface. In Crofton’s climate, you often need both. The original unsealed metal ducts leak at the joints and gain heat in summer from the attic; sealing fixes the pressure loss, and insulation stops the sweating that leads to mold. We’ll tell you which your system needs after the pressure test and camera inspection. Call (361) 326-5060 to schedule.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Crofton since 2004.