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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across Overlea
We seal ducts in Overlea’s older capes, bungalows, and rural properties from our Baltimore office, with crews that know the difference between a Fullerton basement trunk and a Kenwood flex run. Most Overlea appointments are scheduled within a few days, and we call ahead when we’re headed your way. If your first floor never warms up or your utility bills keep climbing, there’s a decent chance your ductwork is leaking pressure into joist bays and crawl spaces. Call (361) 326-5060 for a free estimate. We’ll show up in a marked van, in uniform, and give you a written price before we touch anything.
Why Hollis Air Duct Cleaning Is Overlea’s Preferred Duct Sealing Company
We’ve been doing this since 2004 as part of the Garrison Partners family, and our Duct Sealing in Overlea crew has handled enough local homes to know the patterns. Overlea’s mid-century housing stock isn’t like new construction in Columbia. The ductwork was added after the house was built, often in multiple phases, and the returns were never sized for today’s blowers.
Our technicians are background-checked and uniformed. The price is written down before work starts. And every job carries our 365-Day Done Right Promise: if the seal fails or the pressure balance shifts within a year, we come back 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 waiting until Monday for a callback.
Air Duct Sealing in Overlea
Air Duct Sealing in Overlea means closing the gaps, cracks, and disconnected joints in your forced-air system so the air you paid to heat or cool actually reaches the rooms it was meant for. In Overlea’s older homes, we see a lot of mastic that has dried and cracked, tape that has peeled off in humid basement summers, and flex duct that has pulled loose from registers after decades of vibration. A typical whole-system seal in Overlea runs $850 – $1,800 depending on accessibility, the condition of existing ductwork, and whether returns need resizing. Most jobs take a full day.
Return Trunk Resizing and Sealing
Overlea’s older capes and bungalows often have return ducts that were sized for original gravity or early forced-air systems, which are now undersized for modern blowers. So duct sealing here frequently involves resizing and sealing return trunks in basement ceiling cavities, not just sealing supply runs. We measure static pressure before and after, and we don’t leave until the numbers show balanced flow.
Mastic and Mesh Application
We seal with water-based mastic reinforced with fiberglass mesh, not foil tape that peels in Baltimore County humidity. The mastic stays flexible, fills irregular gaps in older metal trunk lines, and holds up to the temperature swings your attic or basement sees. We apply it to every accessible joint, seam, and penetration.
Duct Sealing Services in Overlea
Duct Sealing Services in Overlea cover everything from spot repairs at a single disconnected register to full-system sealing with pressure testing and airflow balancing. We use Rotobrush rotary systems for agitation and cleaning before we seal, and Nikro negative-air machines to maintain containment during the job. For related maintenance, see our Dryer Vent Cleaning in Overlea. A partial seal of accessible basement trunk lines runs $400 – $700. Full-system sealing with return resizing and camera verification runs $1,200 – $1,800. Every price is written down before we start.
Camera Inspection Before Sealing
We run a camera through your trunk lines before we quote. In Overlea homes, we regularly find crushed flex behind air handlers, disconnected boots in tight joist bays, and previous “repairs” done with duct tape that failed years ago. You see the footage. We explain what needs sealing, what needs replacing, and what can wait.
Pressure Testing After Sealing
After our Duct Sealing team finishes, we pressurize the system and measure leakage at the air handler cabinet, plenum connections, and every sealed joint. The goal is measurable reduction, not just a visual check. We leave you with the before-and-after numbers.
What happens when you call
- 1
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 Overlea
We carry professional-grade equipment and materials from Rotobrush, Nikro, and Abatement Technologies on every Overlea job. That means rotary brush systems that actually scrub duct walls, negative-air containment that keeps debris out of your living space, and sealing products rated for residential HVAC pressures. For filtration upgrades after sealing, we stock Honeywell and Aprilaire media cabinets and can advise on MERV ratings that won’t choke your older blower. Parts are on the truck, so most Overlea jobs don’t wait on a supply run to Glen Burnie or Baltimore.
Common Duct Sealing Problems We See in Overlea Homes
- Sealing only accessible supply registers while leaving undersized return trunks in basement joist bays unsealed. This creates pressure imbalances that pull dust from unpaved roads into the system, especially in rural Overlea properties near the Beltway corridor. We measure return static pressure and resize when needed.
- Using tape or mastic on flexible duct offshoots that have already collapsed or disconnected due to age and blower pressure. The seal looks fine for a few months, then the flex fails again. We replace crushed flex with properly supported rigid duct before sealing.
- Overlooking the air handler cabinet and plenum connections where vibration and condensation in Overlea’s humid summers degrade seals. These gaps bypass your filter entirely, letting pollen and wood smoke recirculate. We seal cabinet seams and plenum joints with rated gasket material.
- Ignoring the impact of wood heat on duct sealing intervals. Overlea properties with wood stoves or inserts as primary or supplemental heat see wider temperature swings in ductwork, accelerating seal degradation. We use high-temp mastic at heat-exposed joints and recommend shorter inspection intervals for wood-heated homes.
Pricing for Duct Sealing in Overlea, MD
Here’s what we charge for duct sealing in Overlea. These are whole-system prices, not per-vent teasers that balloon at the door.
| Service Level | Typical Range |
|---|---|
| Spot seal (1 – 2 accessible leaks, tape replacement) | $250 – $450 |
| Partial seal (basement trunk lines, accessible joints) | $400 – $700 |
| Full-system seal with pressure testing | $850 – $1,200 |
| Full-system seal with return resizing and camera verification | $1,200 – $1,800 |
What moves the price: accessibility (crawl space vs. full basement), the condition of existing ductwork, whether returns need resizing, and how many previous repairs we have to undo. We give you one flat price per system, agreed in writing, before any work starts. No per-vent add-ons. No surprises when the van is in your driveway. Call (361) 326-5060 for a free estimate. We’ll inspect, camera where needed, and hand you a written quote you can compare.
We Also Serve Cities Near Overlea
Our crews work across Baltimore County and the surrounding metro, including Overlea neighbors in Baltimore, Columbia, Ellicott City, and Glen Burnie. Scheduling and dispatch run from our Baltimore office, with local crews covering each area.
Serving Overlea, MD - Our Local Coverage Area
We’re based in the Overlea 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 Overlea
Every 5 – 7 years for wood-heated homes on unpaved roads, compared to 7 – 10 years for standard suburban systems. Rural dust loading and wider temperature swings from wood heat degrade seals faster. Call (361) 326-5060 and we’ll inspect to tell you where your system stands.
Yes, if the uneven heating comes from duct leakage rather than insulation or equipment sizing. We were called to a 1948 cape in Fullerton where the first floor was always cold and the basement ceiling flex runs were crushed and disconnected. Using camera inspection and agitation tools, we found a crushed 6-inch flex offshoot behind the air handler and sealed the supply and return ducts with mastic and mesh, restoring even heating. The homeowner noticed a 20% drop in heating runtime. Call (361) 326-5060 for an inspection.
Yes, we seal ductwork in detached garages, workshops, and converted outbuildings. Outbuilding systems in Overlea face more extreme temperature swings, higher humidity, and often use flex duct that rodents have damaged. We use heavier-gauge materials and exterior-rated mastic, and we inspect for pest intrusion before sealing.
MERV 8 – 11 for most Overlea homes with older blowers; MERV 13 only if your system has been verified to handle the static pressure drop. Sealed ducts improve airflow, but a filter that’s too dense for your blower will still choke the system. We test static pressure after sealing and recommend the right filter for your equipment.
Wood heat creates wider temperature swings in ductwork, from near-ambient when the fire is out to 140°F+ at the plenum when it’s roaring. That thermal cycling cracks mastic and loosens tape faster than gas or heat pump systems. We use high-temp mastic at heat-exposed joints and recommend inspection every 5 years for wood-heated homes. Call (361) 326-5060 to schedule.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Overlea since 2004.