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 Pasadena
Duct sealing in Pasadena, MD typically runs $800 – $2,400 for a whole-house seal, depending on accessibility and whether the home needs prep work before mastic will bond. Most jobs take a full day, and we schedule them with a written price locked in before any technician touches your system. Call (361) 326-5060 for a free estimate with exact numbers for your home.
We’ve worked in Pasadena long enough to know the local housing stock: post-WWII ranch homes and 1960s-70s tract houses with slab foundations, attic duct runs, and original galvanized or flex ductwork that’s been collecting debris for decades. Our dispatch team coordinates from our Baltimore office, and our crews serve Pasadena directly. We know the difference between a standard dust load and the oily film that coats ductwork here, and we price accordingly so there are no surprises when the technician opens the plenum.
Why Hollis Air Duct Cleaning Is Pasadena’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. In Pasadena, that means a track record that predates most of the competitors running coupon mailers today. Our technicians are background-checked and uniformed, and they arrive inside the quoted window – not “sometime between 8 and 5.”
Our 365-Day Done Right Promise covers every duct sealing job in writing. If a sealed joint fails, a collar boot loosens, or the static pressure climbs back up within a year, we return and make it right at no charge, including a free second visit. The price is written down before work starts, and it does not move at the door. That’s The Garrison Standard, and it’s how we operate in Pasadena and every community we serve.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule.
Duct Sealing Services in Pasadena
Duct Sealing Services in Pasadena begin with understanding what you’re actually sealing. Because Pasadena sits downwind of the Houston Ship Channel petrochemical corridor, duct interiors here load with a fine, oily soot that binds to galvanized metal and flex duct rather than dusting off, so sealing decisions must follow a degreasing pass, not precede it. Slab-foundation ranch homes here often hide the return chase inside the slab, meaning a leak found under the slab cannot be sealed from the attic. We camera-inspect first, write the price second, and seal only what we can reach and verify.
A typical whole-house duct sealing in Pasadena runs $800 – $2,400. Homes with accessible attic ductwork, minimal prep, and standard mastic sealing at joints and collar boots fall at the lower end. Homes requiring full degreasing of refinery-soot-coated trunks, re-support of collapsed flex runs, or partial replacement of deteriorated galvanized sections run higher. We break this out line by line in writing before you decide.
Camera Inspection and Static Pressure Testing
Every duct sealing job starts with a camera scope of the trunk and accessible runs, plus a static pressure reading at the air handler. This tells us where the leaks are, whether they’re reachable, and whether the blower motor is already struggling against collapsed or obstructed ductwork. We show you the footage. The reading becomes your baseline.
Mastic Sealing and Foil Tape at Joints
We seal accessible joints, plenum connections, and collar boots with duct mastic and foil tape – not duct tape, which dries and fails. In Pasadena’s humid subtropical climate, proper mastic application matters more than in drier regions; expansion and contraction from summer heat and winter cold cycles will pop a sloppy seal within a season.
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 Pasadena
Duct Insulation in Pasadena addresses a problem the Gulf Coast climate makes unavoidable: attic ductwork that sweats in summer, dripping condensation onto ceiling drywall and breeding mold inside the fiberglass wrap. A typical attic duct insulation job in Pasadena runs $1,200 – $3,000, depending on linear feet of duct, accessibility, and whether we’re reinsulating after sealing or wrapping existing intact insulation with a vapor barrier.
Homes near the Ship Channel or along major truck routes like Fairmont Parkway often need insulation replacement rather than simple wrapping, because the oily particulate saturates the fiberglass and renders it ineffective. We use professional-grade materials from Honeywell and Abatement Technologies, sized and installed to R-values appropriate for Maryland’s climate zone, not one-size-fits-all batts from a hardware store.
Vapor Barrier Wrapping
We wrap sealed and reinsulated ducts with a reinforced vapor barrier jacket, taped at every seam. This stops attic humidity from reaching the metal surface. In Pasadena’s long, hot summers, this is the difference between dry ducts and a ceiling stain that keeps coming back.
Condensate Pan and Drain Inspection
Sweating ducts often mask a bigger problem: an overflowing condensate pan or clogged drain line. We check both while we’re in the attic. If the pan’s cracked or the drain’s blocked, we’ll show you and price the fix separately – no bundling, no pressure.
Trusted Brands We Service in Pasadena
Our equipment roster includes Nikro negative-air machines for controlled debris extraction, Rotobrush rotary brush systems for mechanical agitation inside duct trunks, and filtration and insulation products from Honeywell, Aprilaire, and Abatement Technologies. We stock common collar boots, flex duct diameters, and mastic compounds used in Pasadena’s predominant housing stock, so most jobs don’t wait on parts. When a 1960s ranch off Mountain Road needs a non-standard galvanized fitting, we source it fast because we’ve done enough of these homes to know what’s likely hiding in the attic.
Common Duct Sealing Problems We See in Pasadena Homes
- Sealing over oily refinery soot on galvanized trunk lines. Mastic and foil tape won’t bond to a greasy film, so joints peel within a season and the leak returns worse than before. We degrease first, seal second, and verify the bond with a pull test.
- Flex duct in 1960s-70s Pasadena attics collapses or sags at the collar after sealing. The run was never re-supported, choking airflow and overheating the blower motor. We strap and support every flex run we seal, measured to manufacturer spec.
- Slab-foundation return chases that can’t be reached from the attic. Crews that “seal the whole system” without a camera inspection miss the biggest leak and bill for a partial job. We tell you upfront what’s reachable and what’s not.
- Attic ductwork sweating through degraded insulation. The fiberglass wrap gets wet, compresses, and quits insulating. The metal trunk rusts from the outside in. We strip, seal, reinsulate, and vapor-wrap in one coordinated pass.
Pricing for Duct Sealing in Pasadena, MD
| Service | Typical Range in Pasadena |
|---|---|
| Camera inspection + static pressure test | $150 – $250 (credited toward sealing if hired) |
| Whole-house duct sealing, accessible attic ductwork, standard prep | $800 – $1,400 |
| Whole-house duct sealing with degreasing of refinery-soot-coated trunks | $1,400 – $2,400 |
| Attic duct insulation (wrap or replace, vapor barrier included) | $1,200 – $3,000 |
| Flex duct replacement + sealing at collapsed runs | $300 – $600 per run |
What moves the price: accessibility (tight attic vs. walkable), linear feet of duct, degree of pre-cleaning or degreasing required, and whether we’re addressing insulation simultaneously. We do not quote per-vent prices – that’s a bait-and-switch setup. One flat price per system, agreed in writing, before work starts. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Pasadena
Our crews regularly work in Pasadena and the surrounding communities: Severna Park, Arnold, Glen Burnie, and Crownsville. Each home gets the same camera inspection, written price, and 365-Day Done Right Promise, whether it’s a waterfront property in Severna Park or a ranch off Ritchie Highway in Glen Burnie.
Serving Pasadena, MD - Our Local Coverage Area
We’re based in the Pasadena 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 Pasadena
Because Pasadena sits downwind of the Houston Ship Channel petrochemical corridor, a fine, oily soot coats duct interiors and binds to metal and flex surfaces. Mastic and foil tape won’t adhere to that film, so sealing over it guarantees failure within a season. We degrease with specialized solvents and verify surface readiness before applying sealant. Call (361) 326-5060 for an inspection and exact quote.
No – slab-foundation return chases in Pasadena’s post-WWII ranch homes are cast into the concrete and cannot be reached from the attic or crawlspace without a floor cut. We camera-inspect to locate these leaks, tell you honestly what’s reachable, and seal only what we can verify. Any crew claiming to “seal the whole system” without inspecting the slab chase is selling a partial job at full price.
Homes on unpaved roads or open land around Pasadena load ducts with fine mineral dust and pollen that standard filters don’t catch. With wood heat adding ash and creosote particulate, we recommend inspection every 3 – 4 years and cleaning or resealing when static pressure rises 15% above baseline or visible debris returns at the registers. Rural properties typically need attention 20 – 30% more often than suburban homes on paved streets.
Yes – outbuilding ducts in Pasadena often use lighter-gauge flex duct or PVC runs not rated for residential static pressure, and they rarely have proper insulation or vapor barriers. We assess whether the existing material can hold a seal, whether the blower is sized correctly for the run length, and whether the building envelope needs addressing before duct sealing makes sense. The price reflects what’s actually fixable.
Static pressure measures how hard your blower works to push air through the duct system. Before sealing, a high reading means leaks, blockages, or collapsed runs are forcing the motor to overwork. After proper sealing and re-support, the reading should drop back near the manufacturer’s rated curve for your blower. We record both numbers in writing, explain what they mean for your energy bills and equipment life, and guarantee the result for 365 days. Call (361) 326-5060 to schedule.
On a post-WWII ranch off Fairmont Parkway, our tech camera-inspected the supply and return ducts and found the original galvanized trunk sweating in the attic, with flex runs collapsing at the collars and oily refinery soot streaking the first ten feet past the air handler. We ran agitation tools under negative pressure with HEPA filtration, degreased the trunk, then sealed the accessible joints and collar boots with mastic and foil tape – and told the homeowner the under-slab return chase was out of reach without a floor cut. The measurable result was static pressure dropping back near the blower motor’s rated curve, so the system stopped pulling attic air through the unsealed boots.
Ready to find out which leaks in your Pasadena home are actually sealable? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free camera inspection and written estimate. We’ll show you what we find, price only what we can fix, and stand behind the work for a full year with our 365-Day Done Right Promise. Our Duct Sealing team serves Pasadena and surrounding communities with background-checked, uniformed technicians and professional-grade equipment – priced in writing before we start, guaranteed in writing after we finish.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Pasadena since 2004 as part of the Garrison Partners family.