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 Kennesaw
Duct sealing in Kennesaw typically runs $450 – $1,200 for a whole-house job, depending on whether we’re sealing accessible joints in a 1990s subdivision home or rebuilding crushed runs in a downtown bungalow’s crawlspace. Most Kennesaw homeowners see the work completed in a single day, with pressure testing done before we leave to prove the seal held.
We’ve been driving to Kennesaw since our Atlanta office opened scheduling for this market, and our crews know the difference between a Legacy Park split-level with flex duct in the attic and a 1920s bungalow off Main Street with original rigid metal in the crawlspace. That local knowledge matters because the sealing method, the materials, and the price all change based on what we’re working with. If your upstairs rooms never cool down or your energy bills spike every July, call us at (361) 326-5060. We’ll give you a written price before any work starts, and every job carries our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Kennesaw’s Preferred Duct Sealing Company
Our Duct Sealing team has built a reputation in Kennesaw by showing up inside the quoted window and pricing the job in writing before touching a tool. Homeowners here have told us they chose Hollis because the last crew gave a phone estimate that doubled once the van was in the driveway. That doesn’t happen under The Garrison Standard.
We know Kennesaw’s housing stock because we’ve worked in it. Our technicians have sealed ducts in crawlspaces full of red clay dust near Watts Drive, reconnected crushed flex runs in Legacy Park attics after HVAC replacements, and pressure-tested systems in Kennesaw Highlands new builds where construction debris had already punctured the ductwork. That field experience means we diagnose faster and quote accurately the first time.
Every Hollis technician is background-checked, uniformed, and accountable to The Garrison Code: arrive inside the window, price in writing, complete the job by the book, leave the site clean. If the seal fails within a year, we return and make it right at no charge, including a free second visit. No negotiation, no runaround.
Duct Sealing Services in Kennesaw
Duct Sealing Services in Kennesaw cover the full range of leak repair, from sealing joints with mastic and mesh to replacing crushed or disconnected runs and verifying the fix with pressure testing. Most Kennesaw homeowners call us after noticing hot rooms, high summer power bills, or musty air from the vents. A typical whole-house sealing job in Kennesaw runs $450 – $1,200, with simpler accessible-work jobs at the lower end and crawlspace rebuilds in older homes toward the higher end.
Leak Detection and Pressure Testing
We start every Kennesaw job with a camera inspection and pressure test to find where conditioned air is escaping. In downtown bungalows, we regularly find quarter-inch gaps at metal duct joints that have worked loose over decades of expansion and contraction. In newer subdivisions, we find kinked flex duct that looks fine from the outside but is pinched flat inside the attic insulation. The pressure test gives us a baseline, and we run it again after sealing to prove the improvement.
Mastic Sealing and Run Repair
For rigid metal ducts, we brush on water-based mastic reinforced with fiberglass mesh at every joint, boot, and penetration. Mastic stays flexible, so it won’t crack like tape. For flex duct, we replace crushed or punctured sections with new insulated flex, then seal the connections with proper collars and straps. We don’t patch over rodent damage or cover it with tape and hope. If the insulation is gnawed through, we replace it.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Duct Insulation in Kennesaw
Duct Insulation in Kennesaw addresses a problem our crews see constantly: sweating ducts in humid crawlspaces and attics that drip condensation onto ceilings and framing, and uninsulated runs that lose 20 – 30% of their conditioned air before it reaches the room. Kennesaw’s humid subtropical climate means crawlspace ducts are bathed in moisture from May through October, and bare metal or thin flex without proper insulation becomes a mold risk and an energy drain. Typical duct insulation work in Kennesaw runs $600 – $1,800 depending on linear footage, accessibility, and whether we’re re-insulating after rodent damage.
Crawlspace Insulation Replacement
In older Kennesaw homes with crawlspace duct runs, we often find insulation that has absorbed moisture, compressed to half its original thickness, or been torn by rodents drawn to the clay soil and nearby wooded areas. We strip the damaged wrap, seal the underlying duct, then apply new R-8 fiberglass insulation with a vapor barrier jacket. The fix stops condensation, protects against future pest damage, and keeps the air at temperature from the air handler to the register.
Attic Run Upgrades
In Legacy Park and similar subdivisions, flex duct in attics often sits directly on the ceiling joists where roof heat radiates up through the insulation. We suspend new insulated runs from strap hangers to improve airflow and reduce thermal loss, then seal every connection before wrapping. The result is more even temperatures room-to-room and less strain on your compressor during Kennesaw’s July-August peak.
Trusted Brands We Service in Kennesaw
Hollis stocks parts and materials from Rotobrush, Nikro, Abatement Technologies, and Guardsman so Kennesaw jobs don’t wait on shipping. Our rotary brush systems handle the debris removal that should precede any sealing work, and our Nikro negative-air machines keep dust contained during the job. For filtration upgrades after sealing, we carry Honeywell and Aprilaire media filters sized to the most common Kennesaw HVAC configurations. That local inventory means most repairs finish same-day, not next-week.
Common Duct Sealing Problems We See in Kennesaw Homes
- Original rigid metal ducts in downtown bungalows separate at every joint. Decades of expansion and contraction have opened gaps as wide as a quarter-inch at boots and trunk connections, pulling humid crawlspace air directly into the supply stream. Sealing these requires mastic, mesh, and patience, not tape.
- Flex duct in Legacy Park and 1990s subdivisions gets kinked during attic HVAC replacements. A new air handler sits taller or shorter than the old one, and the installer forces the existing flex to fit. The result is a flattened run that starves far registers of airflow. We replace the crushed section and seal properly.
- Crawlspace runs suffer rodent damage where red clay soil and wooded lots meet. Gnawed insulation and punctured flex defeat any sealing unless the damage is repaired first. We inspect for active infestation, replace chewed materials, then seal and re-insulate.
- Return ducts pull attic air through gaps around the filter rack. In Kennesaw’s pollen-heavy springs, this means unfiltered outdoor air full of oak and pine particulate bypassing your filter entirely. We seal the return path so everything passes through the media.
Pricing for Duct Sealing in Kennesaw, GA
A typical whole-house duct sealing job in Kennesaw runs $450 – $1,200. Accessible attic work with straightforward joint sealing sits at the lower end. Crawlspace jobs in older homes with disconnected runs, rodent damage, or multiple crushed sections trend toward the higher end. Duct insulation added to the scope runs $600 – $1,800 additional depending on linear footage.
What moves the price: accessibility (crawlspace height, attic hatch location), extent of damage requiring replacement versus sealing only, and whether we need to coordinate with an HVAC contractor for air handler modifications. We do not quote per-vent or per-linear-foot teaser prices that balloon at the door. We inspect, we measure, we write the price down, and that number does not move once work begins. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Kennesaw
Our crews based from the Atlanta office also handle Duct Sealing in Kennesaw and surrounding communities including Acworth, Marietta, Woodstock, and Powder Springs. The same written pricing, same background-checked technicians, same 365-Day Done Right Promise apply across the service area.
Serving Kennesaw, GA - Our Local Coverage Area
We’re based in the Kennesaw 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 Kennesaw
Original rigid metal ducts from the 1920s – 1950s were sized for gravity furnaces and sealed with tape or simple friction fits that have failed after decades of thermal cycling. Modern flex duct uses sealed collars and proper straps from installation. Your bungalow’s quarter-inch gaps at every joint are typical for the era and fixable with mastic and mesh. Call (361) 326-5060 for an inspection and written estimate.
Sealing alone won’t eliminate musty odors if mold or mildew is already established on the duct interior. We typically combine sealing with rotary brush cleaning to remove the biological growth, then seal the system to prevent re-infiltration of humid attic or crawlspace air. If the smell persists after that, we inspect for standing water or drainage issues in the crawlspace. Call (361) 326-5060 to discuss the right sequence for your home.
Kennesaw’s oak and pine pollen season peaks March through May, and we see homeowners schedule sealing then because their filters clog within weeks and symptoms spike. Sealing during or after pollen season is fine, but we recommend pairing it with a thorough cleaning so the sealed system isn’t circulating accumulated particulate. We can schedule both in one visit. Call (361) 326-5060.
Register sealing alone misses the leaks that matter most. In Kennesaw crawlspaces, we routinely find disconnected trunk lines and gaps at boots that dump conditioned air under the house before it ever reaches the register. Sealing only at the room end would leave those major leaks open. Our inspection identifies where the real losses are, and we seal every point, not just the visible ones. Call (361) 326-5060 for a full evaluation.
Sealing won’t stop rodents from entering the crawlspace, but it will eliminate the gnawed entry points and nesting cavities inside your ductwork that spread droppings and dander through your vents. We replace chewed flex or insulation, seal with rodent-resistant materials, and can recommend exclusion improvements for the crawlspace itself. If you have active infestation, address that first, then seal. Call (361) 326-5060 to assess the scope.
We were called to a 1920s bungalow off Main Street where the homeowner complained that the back bedrooms never got cool air despite a new air handler. During a camera inspection we found a disconnected rigid metal run in the crawlspace, crushed by a plumbing repair, and a return duct pulling attic air through a 1-inch gap. After reconnecting the run and sealing the joints with mastic and mesh, the supply and return ducts held pressure and the back rooms finally matched the thermostat. That kind of repair-first approach is what Kennesaw’s split housing stock demands.
Kennesaw’s rapid growth from a small railroad town to a bustling suburb has left a mix of historic homes near downtown and sprawling new developments, each with distinct air duct issues tied to construction era and local red clay soil. The city’s strict building codes and active homeowner associations often mandate regular duct maintenance, making professional sealing a common checklist item for both older and newer homes. Whether your house dates to the railroad era or was built last year in Kennesaw Highlands, the sealing method should match the materials, not force a one-size-fits-all product.
Ready to stop losing conditioned air to your crawlspace or attic? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll inspect your system, write the price before any work starts, and back every seal with our 365-Day Done Right Promise. If it fails, we come back and make it right at no charge.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Kennesaw since 2004.