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 Delaware
We seal ducts in Delaware homes where the housing stock tells two different stories: pre-1900 Victorians and Craftsmans in the Northwest and Northeast neighborhoods with retrofitted or transite ductwork, and 1990s – 2010s subdivisions on the east side with flex duct runs baking in unconditioned attics. Our crews are dispatched from the Cleveland office and cover Delaware regularly, including the streets around Ohio Wesleyan University and the historic district west of Sandusky Street. If your vents blow weak, your upstairs rooms won’t heat, or your energy bills climbed last winter, leaky ducts are the likely culprit. Call us at (361) 326-5060 for a free estimate with a written price before any work starts.
Why Hollis Air Duct Cleaning Is Delaware’s Preferred Duct Sealing Company
We’ve been part of the Garrison Partners family since 2004, and our Duct Sealing team has worked enough Delaware homes to know the difference between a Northwest Neighborhood Craftsman with original coal-conversion ducts and a east-side subdivision with builder-grade flex. Delaware homeowners leave reviews mentioning our technicians by name, noting they arrived inside the quoted window, wore uniforms, and left the site clean. Dispatch and scheduling run through our Cleveland office, but the crew that pulls up to your driveway knows Delaware’s streets, its permit requirements for historic district work, and the specific failure modes this climate produces. That local fluency means we diagnose faster and seal right the first time, backed by our 365-Day Done Right Promise in writing on every job.
Duct Insulation in Delaware
Duct Insulation in Delaware addresses a problem most homeowners don’t know they have: conditioned air bleeding into attics, crawl spaces, or wall cavities before it ever reaches the room. In Delaware’s climate, with January lows around 20°F and summer humidity pushing attic temperatures past 120°F, uninsulated or poorly insulated ductwork forces your furnace and air conditioner to run longer cycles for the same result. A typical duct insulation job in Delaware runs $450 – $850 for a standard residential system, depending on accessible linear footage and whether we’re working in a tight historic basement or a modern attic with headroom.
Attic Flex Duct in East-Side Subdivisions
The 1990s – 2010s builds in eastern Delaware often have flex duct suspended in unconditioned attics. Summer condensation collects on the exterior, saturating surrounding insulation; winter cold snaps freeze any residual moisture and degrade the vapor barrier. We remove compromised wrap, seal every joint with mastic, then reinstall with proper R-6 or R-8 insulation and support straps that prevent sagging.
Basement and Crawl Space Runs in Older Homes
Northwest Neighborhood homes with partial basements or stone crawl spaces present the opposite problem: ductwork routed through damp, cool zones where condensation forms on the interior. We inspect for standing water, seal the metal seams, then apply closed-cell foam or fiberglass wrap with a proper vapor barrier, depending on clearance and moisture conditions.
HVAC Duct Sealing in Delaware
HVAC Duct Sealing in Delaware closes the gaps, cracks, and disconnected joints that leak conditioned air into spaces where you don’t live. The average Delaware homeowner loses 20 – 30% of heated or cooled air through duct leakage, according to Department of Energy estimates; in older homes with decades of settling and retrofit work, that figure often runs higher. A full-system HVAC duct sealing in Delaware typically costs $650 – $1,400, with simpler partial repairs starting around $280 – $450. We price by the system, not by the vent, and the written quote you receive before work begins is the price you pay.
Transite and Historic Ductwork Protocols
Pre-1930 homes in the Northwest Neighborhood may still contain transite (asbestos-cement) duct runs from original coal-to-gas conversions. Sealing these requires HEPA filtration and negative pressure containment under asbestos-handling protocols before any mastic or mesh application. Our crews carry the equipment and training; most Delaware competitors don’t encounter this often enough to keep the protocol current.
Modern High-Efficiency System Integration
Newer Delaware homes with variable-speed furnaces and high static pressure need sealing that accounts for airflow balancing. A tight duct system on an oversized blower motor can overwork the equipment. We measure static pressure before and after sealing, adjusting dampers or recommending minor modifications to protect your investment.
Trusted Brands We Service in Delaware
We stock parts and filtration products from Honeywell, Aprilaire, and Abatement Technologies for Delaware jobs, with access to Nikro negative-air equipment when containment protocols apply. For a 1910s Craftsman on West William Street in the Northwest Neighborhood, that meant having HEPA filtration and negative pressure setup ready before the truck left the Cleveland office. For an east-side subdivision off Houk Road, it meant the right mastic and mesh for flex duct that sees 120°F attic heat in July. We don’t order parts after we arrive. We show up prepared for what Delaware’s housing stock actually presents.
Common Duct Sealing Problems We See in Delaware Homes
- Transite duct joints failing in Northwest Neighborhood historic homes. Original asbestos-cement duct runs from coal conversions develop cracks at the seams, releasing a metallic, gritty odor when the furnace cycles. Standard sealing without HEPA containment disturbs fibers and fails inspection.
- Mastic peeling on east-side flex duct after one season. Builder-grade flex in unconditioned attics sees temperature swings from below freezing to over 120°F. Standard mastic application without proper surface prep and reinforcement mesh separates within months.
- Pressure imbalances in downtown rental conversions near Ohio Wesleyan. Sealing supply and return registers without measuring total system airflow can overwork the blower motor and pull attic contaminants through remaining gaps into living space.
- Shared dryer vent stacks in older multi-unit buildings. Sealing one unit’s connection without inspecting the full stack traps lint and moisture, creating fire hazards and mold conditions that affect every tenant.
Pricing for Duct Sealing in Delaware, OH
A typical duct sealing job in Delaware runs $650 – $1,400 for a full residential system, with partial repairs or single-zone work starting at $280 – $450. Duct insulation adds $450 – $850 depending on linear footage and access difficulty. Historic homes with transite protocols fall at the higher end due to HEPA containment and disposal requirements; straightforward east-side subdivision work with good attic access falls lower. What moves the price: accessibility (crawl space versus walk-in attic), material condition (whether we can seal existing duct or must replace sections first), and system size. We give one flat price per system, agreed in writing before any work starts. No per-vent pricing. No invoice that balloons once the technician is inside. Call (361) 326-5060 for a free estimate, we’ll inspect your system, and you’ll have a written number to consider with no pressure.
We Also Serve Cities Near Delaware
Our crews cover Duct Sealing in Delaware and the surrounding area, including Powell, Sunbury, Columbus, and Dublin. Each community has its own housing patterns and duct configurations, from Powell’s 1990s – 2000s subdivisions to Sunbury’s mix of historic center and new construction. We bring the same written pricing, background-checked uniformed technicians, and 365-Day Done Right Promise to every job.
Serving Delaware, OH - Our Local Coverage Area
We’re based in the Delaware 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 Delaware
Yes. We set up HEPA filtration and negative pressure containment under asbestos-handling protocols before touching any transite duct. Our crew then seals accessible runs with mastic and mesh, disposing of all contaminated materials properly. This is standard for us but rare among competitors who don’t regularly work Delaware’s historic stock. Call (361) 326-5060 to schedule an inspection and written estimate.
Yes. We coordinate with property managers for building access and schedule around tenant hours. For shared systems, we inspect the full duct layout before sealing any branch to avoid pressure imbalances that affect other units. Street parking on Winter or Spring Street is workable with advance notice. Call (361) 326-5060 and we’ll arrange the logistics with your building contact.
Shared stacks require inspecting the full vertical run from roof cap to basement connection before sealing any individual unit’s branch. Sealing one connection without clearing lint buildup or checking for disconnections upstream traps heat and moisture, creating fire and mold risks for every tenant. We scope the full stack, clean if needed, then seal with proper backdraft dampers. For dryer vent maintenance, see our Delaware Dryer Vent Cleaning service. Call (361) 326-5060 for a building assessment.
Humid summers condense moisture on cool duct surfaces, degrading mastic adhesion and saturating insulation. Cold winters contract flex duct material, stressing sealed joints. We use reinforced mastic with mesh on these systems, properly support duct to prevent sagging, and verify insulation integrity so the seal survives both extremes. Annual inspection is worth considering given Delaware’s temperature swing. Call (361) 326-5060 to check your attic duct condition.
We match filtration to your system’s rated static pressure capacity, typically MERV 11 – 13 for high-efficiency variable-speed units, using Honeywell or Aprilaire cabinet filters where space allows. Over-filtering a system not designed for it restricts airflow and can void warranties. After sealing, we measure total external static pressure to confirm the blower motor isn’t overworking with the new, tighter duct system. Call (361) 326-5060 for a system evaluation and written recommendation.
Ready to stop losing heated and cooled air to your attic, basement, or wall cavities? Call (361) 326-5060 for a free estimate on duct sealing in Delaware. We’ll inspect your system, explain what we find in plain terms, and give you a written price before any work starts. Every job carries our 365-Day Done Right Promise: if the seal fails or the problem returns within a year, we come back and make it right at no charge, including a free second visit. That’s The Garrison Standard. That’s how Hollis works.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Delaware and central Ohio since 2004.