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 Johns Creek
We seal ducts in Johns Creek homes built from the 1980s through the 2010s, where flexible ductwork in unconditioned attics has often sagged, disconnected, or started pulling attic air into the system. Our crews dispatch from the Atlanta office and carry Guardsman-approved mastic, foil tape, and negative-air HEPA equipment to jobs across Medlock Bridge, St. Ives, and the broader Johns Creek area. If your upstairs rooms never balance, your energy bills keep climbing, or you smell musty air from the registers, the problem is usually not the HVAC unit itself. It’s the duct path between the air handler and your rooms. Call (361) 326-5060 for a free estimate. We’ll put the price in writing before any work starts.
Why Hollis Air Duct Cleaning Is Johns Creek’s Preferred Duct Sealing Company
Hollis has been part of the Garrison Partners family since 2004, and our Duct Sealing crews have worked enough Johns Creek homes to know what the building stock hides. We don’t guess. We camera-inspect, pressure-test, and show you what we find before we quote.
Our technicians are background-checked, uniformed, and held to The Garrison Code: arrive inside the window, price in writing, complete the job by the book, leave the site clean. Every repair carries our 365-Day Done Right Promise in writing. If the seal fails or the reconnect comes loose within a year, we return 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 callback queues, no waiting until Monday to schedule.
HVAC Duct Sealing in Johns Creek
HVAC Duct Sealing in Johns Creek is typically a moisture-control and pressure-balance job on large homes with zoned systems and flexible duct runs through hot, humid attics. The work involves finding leaks at joints, seams, and register boots, then sealing them with mastic and foil tape rated for the temperature swings these attics see. We also pressure-test the system after sealing to verify the fix. In Johns Creek, a typical HVAC duct sealing job runs $450 – $1,200 depending on system size, accessibility, and whether we find disconnected runs that need reconnecting. Homes with multiple zones or ductwork buried in crawlspaces run toward the higher end.
Attic Flex Duct and Condensation Control
Johns Creek’s humid subtropical climate means attic temperatures hit 140°F in July while dew points stay high. Flexible ductwork sags between trusses, pools condensation on the jacket, and grows mold that sealing alone won’t stop. We address the moisture path first, then seal. Otherwise you’re sealing wet ducts.
Pressure Testing After the Seal
We run a duct blaster or calibrated pressure test after sealing to prove the system holds. Homeowners get the before and after numbers. No guesswork, no “it feels better.” Measurable results.
Duct Repair in Johns Creek
Duct Repair in Johns Creek often starts as a cleaning call and becomes a reconnect-and-replace job once we open the system. Original flex duct from the 1980s – 2010s construction era cracks at the collar, gets crushed by storage in the attic, or pulls completely loose at the air handler plenum. We replace damaged sections with new insulated flex or rigid duct where appropriate, reconnect returns that were pulling attic air, and seal every joint. Typical Duct Repair in Johns Creek runs $350 – $950 for section replacement and reconnection, with full-system rebuilds on large zoned homes reaching $1,500 – $2,800. Every repair gets a written price before we start and the 365-Day Done Right Promise in writing.
Disconnected Return Runs at the Air Handler
In multi-zone Johns Creek homes, return ducts disconnect at the air handler and the system keeps running. It pulls 130°F attic air into your supply. Homeowners notice musty smells and rooms that never cool. We find these with camera inspection, not guesswork.
Crushed Duct from Attic Storage
Johns Creek’s large homes have large attics, and homeowners store holiday decorations, luggage, and bins on the duct runs. Flex duct crushes flat. Air stops moving. We replace the flattened section and route the new run to avoid traffic.
Trusted Brands We Service in Johns Creek
We carry professional-grade equipment from Nikro and Abatement Technologies on every Johns Creek job, and stock filtration and sealing products from Honeywell and Aprilaire for fast turnaround when your system needs more than tape. Our rotary brush systems and negative-air machines are the same tools commercial crews use, not hardware-store gear. If your Johns Creek home has a specialty zoning panel, electronic air cleaner, or ERV tied to the duct system, we source compatible parts and seal around them without disrupting the whole setup.
Common Duct Sealing Problems We See in Johns Creek Homes
- Sagging flex duct in unconditioned attics. Johns Creek’s summer humidity condenses on the cool duct jacket, soaking the insulation and growing mold. Sealing the joints helps, but the real fix often includes supporting the run properly and addressing the thermal boundary.
- Disconnected returns at multi-zone air handlers. In 4,000+ square foot homes with three or more zones, return ducts pull loose at the plenum and draw attic air straight into the supply side. The system runs constantly, bills spike, and indoor air quality drops.
- Homeowner-only sealing at register boots. We see this after DIY attempts or cut-rate cleanings: the visible boot gets caulked, but buried joints in crawlspaces and wall chases stay open, pulling unconditioned air year-round and defeating the effort.
- Original duct materials from the 1980s – 2000s failing at collars. The adhesive and tape used in original Johns Creek construction dries and cracks after 20 – 30 years. Joints that looked sealed in 2005 are wide open in 2025.
Pricing for Duct Sealing in Johns Creek, GA
A typical HVAC duct sealing job in Johns Creek runs $450 – $1,200 for a single-zone system with accessible attic ductwork. Multi-zone homes in neighborhoods like St. Ives or Medlock Bridge, with longer runs and crawlspace access, typically fall in the $800 – $1,800 range. Duct repair with section replacement adds $350 – $950 per damaged run. Full-system rebuilds on the largest homes can reach $1,500 – $2,800.
What moves the price: number of zones, attic vs. crawlspace access, whether we find disconnected returns that need reconnecting, and if mold remediation is needed before sealing. We put the full price in writing before any work starts. One flat price per system. No per-vent pricing, no add-ons at the door. Call (361) 326-5060 for a free estimate. We’ll inspect, photograph what we find, and give you the number.
We Also Serve Cities Near Johns Creek
Our Duct Sealing in Johns Creek crews also work Atlanta, South Fulton, Sandy Springs, and Roswell from the Atlanta dispatch office. Same equipment, same written pricing, same 365-Day Done Right Promise.
Serving Johns Creek, GA - Our Local Coverage Area
We’re based in the Johns Creek 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 Johns Creek
Johns Creek’s large-lot homes in neighborhoods like Medlock Bridge and St. Ives were often built with zoned HVAC systems whose flexible duct runs pass through unconditioned attics and crawlspaces, so summer condensation and sagging turn sealing into a moisture-control problem, not just an efficiency upgrade. Original duct materials from the 1980s – 2010s construction era frequently show disconnected or crushed runs that only become visible once source removal begins. The humid subtropical climate here accelerates failure modes that drier suburbs see more slowly. Call (361) 326-5060 for a free inspection.
We use camera inspection and agitation tools under negative pressure with HEPA filtration to see inside the full duct path, not just the reachable trunk lines. A standard cleaning without camera verification can blow past a disconnected return six feet from the air handler. We recently worked a duct sealing call in St. Ives on a 4,800-square-foot home with three HVAC zones; the homeowner reported upstairs rooms smelling musty and never getting comfortable. Our tech found the original flex duct in the attic had sagged, pooled condensation, and two return runs were completely disconnected at the air handler. Camera inspection found it. Cleaning alone would not have. Call (361) 326-5060 to schedule.
Sealing alone cannot fix mold; it can only stop the moisture intrusion that feeds it. If your Johns Creek home has mold in the ducts, we address the source first, often sagging flex duct with condensation pooling, then clean and treat the affected sections, then seal to prevent recurrence. Sealing wet ducts traps moisture and makes the problem worse. We inspect first, quote the full scope in writing, and never seal over active microbial growth. Call (361) 326-5060 for an assessment.
Yes. In fact, multi-zone homes in Johns Creek are our most common duct sealing call. Zoned systems have more joints, more transitions, and longer flex runs, all of which create more failure points. We pressure-test each zone independently, seal or reconnect as needed, and verify balanced airflow room by room. The written price covers the full system, not per-zone add-ons. Call (361) 326-5060 for a quote on your zoned home.
We seal with Guardsman-approved mastic and foil tape, inspect with Nikro and Abatement Technologies camera and negative-air systems, and stock Honeywell and Aprilaire filtration products for integrated upgrades. Every tool is professional-grade, explained in plain terms on the job, and operated by background-checked, uniformed technicians. Call (361) 326-5060 to discuss your system.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Johns Creek and the greater Atlanta area since 2004.