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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After
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Before
AfterFast, Reliable Duct Sealing Across Swarthmore
If your Swarthmore home’s upstairs rooms never match the thermostat, or your energy bills spike every July and January, leaking ductwork is the likely culprit. Duct sealing in Swarthmore typically runs $450 – $1,200 for a whole-home seal, depending on accessibility and the condition of your existing system. Call (361) 326-5060 and we’ll give you a written price before any work starts.
We’ve worked on the tree-lined streets near Swarthmore College, the center-hall Colonials along Rutgers Avenue, and the Tudors tucked behind the train station. Our crews know the borough’s housing stock: plaster walls that don’t forgive sloppy cuts, crawlspaces added as afterthoughts, and ductwork from the 1960s that was never designed to be accessed again. Roy Castellanos and our team dispatch from the Philadelphia office, and we regularly schedule Swarthmore jobs within a day or two of your call.
Why Hollis Air Duct Cleaning Is Swarthmore’s Preferred Duct Sealing Company
Swarthmore homeowners don’t hire us for flashy trucks. They hire us because we show up inside the window, price the job in writing, and leave the site clean. That’s The Garrison Standard, and it’s how every Hollis crew operates.
Our technicians are background-checked and uniformed. You’ll know who’s walking into your home before they arrive. Phones are answered by a live person 24 hours a day, 7 days a week, no voicemail loops.
The 365-Day Done Right Promise covers every duct sealing job we do in Swarthmore. If the seal fails within a year, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.
We understand the local conditions that break duct seals in this borough: humid summers that swell and contract metal joints, cold winters that pull apart mastic in unconditioned crawlspaces, and the fine debris from Swarthmore’s oak and maple canopy that works its way into gaps and accelerates deterioration.
Air Duct Sealing in Swarthmore
Air Duct Sealing in Swarthmore means finding and closing every gap, joint separation, and pinhole leak in your forced-air system, then verifying the repair with a pressure test. Most Swarthmore homes we see lose 20 – 30% of conditioned air through leaks before it ever reaches the rooms, which is money you’re paying to heat or cool your crawlspace. We seal with mastic compound and metal-backed tape, the methods that last, not the duct tape that fails in six months.
A typical whole-home seal in Swarthmore runs $450 – $1,200. Smaller partial seals, like a single leaky trunk line in a finished basement, can run $200 – $400. We give you the written price before we touch anything.
Sealing in Older Homes
Swarthmore’s pre-1940 housing stock presents specific challenges. Ducts were often added during mid-century renovations and run through original plaster walls or tight crawlspaces. Our crews use low-impact access methods and protect finished surfaces. We seal what we can reach and tell you honestly when a section needs replacement rather than a patch.
Post-Cleaning Seals
After our Air Duct Cleaning in Swarthmore, we often find separations that weren’t visible until the debris was cleared. We can seal those same-day if you choose, with one written price for both services.
Duct Sealing Services in Swarthmore
Duct Sealing Services in Swarthmore cover everything from spot repairs on accessible trunk lines to full-system Aeroseal applications that reach leaks inside finished walls. We assess your system with a pressure test, identify where the air is escaping, and recommend the right method for your home’s layout and your budget. Most jobs take 3 – 5 hours, and you’ll feel the difference in airflow balance the same day.
Our Duct Sealing team carries professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies. These are the same tools commercial crews use, not hardware-store gear, and we explain what each piece does before we start.
Pressure Testing First
We don’t guess. Every sealing job begins with a duct blaster test that measures exactly how much air your system is losing. You see the number before and after. In Swarthmore’s older homes, we often find the worst leaks at the furnace connection and at joints where ducts pass through unconditioned basement walls.
Mastic vs. Aeroseal
Accessible leaks get brushed with mastic, a thick sealant that flexes with temperature changes. For leaks inside finished walls or tight soffits, we may recommend Aeroseal, a fog of sealant particles that finds and plugs gaps from the inside. We explain which method fits your home and why, with prices for both.
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.
Trusted Brands We Service in Swarthmore
We stock sealing materials and filtration products from Honeywell, Aprilaire, and Guardsman, with common fittings for the duct configurations found in Delaware County homes. If your system needs a component we don’t carry, our Philadelphia office sources it fast, usually within a day. We don’t make you wait a week for a seal to be finished because a part is on order.
Common Duct Sealing Problems We See in Swarthmore Homes
- Collapsed flex duct in crawlspaces. Swarthmore’s humid summers soften the outer jacket of flex duct, and the weight of moisture-laden insulation pulls sections apart at the seams. We find this regularly beneath homes near Crum Creek, where groundwater runs high and ventilation is poor.
- Leaky returns pulling in basement air. Many center-hall Colonials have return ducts that were cobbled into basement joist bays during the 1950s or 60s. Those wood-framed channels leak constantly, drawing musty basement air into your living space. We seal them with mastic and metal backing.
- Separated joints behind finished basement walls. When Swarthmore homeowners refinished their basements decades ago, they often buried duct joints behind drywall with no access panel. We locate those leaks with a pressure test and create minimal-access openings to seal them properly.
- Fibrous seed pod infiltration near the college. Technicians working near the Swarthmore College campus regularly encounter ducts clogged with seed pods from the campus’s massive London plane trees. That same debris mats around leaky joints and accelerates corrosion, making sealing essential before the metal deteriorates further.
Pricing for Duct Sealing in Swarthmore, PA
Whole-home duct sealing in Swarthmore typically costs $450 – $1,200. Partial sealing of accessible trunk lines runs $200 – $400. Aeroseal for leaks inside finished walls adds $800 – $1,500 depending on system size. These are honest ranges for this market, not teaser prices that jump once we’re in your home.
What moves the price: how much of your ductwork is accessible, whether we need to create access openings in finished surfaces, and whether your system needs cleaning before sealing (dirty ducts hide leaks and contaminate fresh mastic). We give you one flat price per system, agreed in writing, before any work starts. No per-vent pricing, no add-ons at the door.
Every sealing job includes before-and-after pressure test results, so you know exactly what was accomplished. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Swarthmore
Our crews work throughout Delaware County and the surrounding area. If you’re in Swarthmore or nearby Folsom, Woodlyn, Ridley Park, or Prospect Park, we cover your neighborhood. We also handle Dryer Vent Cleaning in Swarthmore for homeowners who want their full ventilation system checked in one visit.
Serving Swarthmore, PA - Our Local Coverage Area
We’re based in the Swarthmore 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 Swarthmore
Whole-home duct sealing in Swarthmore typically runs $450 – $1,200, with partial repairs at $200 – $400 and Aeroseal applications at $800 – $1,500. We give you a written price before any work starts. Call (361) 326-5060 for a free estimate on your specific system.
We typically schedule Swarthmore jobs within one to two business days, dispatching from our Philadelphia office. We don’t promise same-day service because duct sealing is a scheduled job that requires proper assessment, but we keep slots open for urgent comfort issues. Call (361) 326-5060 to check availability.
Yes, we work throughout the borough, from the homes near Swarthmore College and the train station to the residential streets toward Crum Creek and the Ridley Creek corridor. Our crews are familiar with the access challenges in each area, whether it’s a Victorian with a stone foundation or a mid-century split-level with a finished basement.
Swarthmore prices are comparable to Folsom, Woodlyn, Ridley Park, and Prospect Park. The bigger cost driver is your home’s duct accessibility, not your ZIP code. Older Swarthmore homes with plaster walls and tight crawlspaces sometimes require more labor, which we account for in the written price we give you upfront.
Every duct sealing job is covered by our 365-Day Done Right Promise. If the seal fails within one year, Hollis returns and makes it right at no charge, including a free second visit. This is backed in writing on every job, not a verbal assurance that disappears when you need it.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Swarthmore and the greater Philadelphia area since 2004.