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 Five Corners
We dispatch our Duct Sealing crews to Five Corners from our Seattle office, and we’ve learned the roads well enough to hit our arrival windows even when harvest traffic backs up SR-503. If you live in a 1970s ranch off 299th Street or a split-level near the Five Corners town center, your ductwork probably has stories to tell. Call us at (361) 326-5060 for a free estimate. We’ll show up uniformed, price the job in writing before we touch anything, and stand behind it for a full year.
Why Hollis Air Duct Cleaning Is Five Corners’s Preferred Duct Sealing Company
We’ve been serving Five Corners long enough to know which attics cook to 120 degrees in August and which crawlspaces stay muddy through April. That matters when you’re sealing duct joints that have been expanding and contracting through forty Washington winters.
Our technicians follow The Garrison Code on every job: arrive inside the quoted window, price in writing, complete the work by the book, leave the site clean. Every crew member is background-checked and uniformed, and our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues.
The 365-Day Done Right Promise covers every duct sealing job we do in Five Corners. If a seal fails within a year, we return and make it right at no charge, including a free second visit. The price is written down before any work starts, and it does not move at the door.
HVAC Duct Sealing in Five Corners
HVAC Duct Sealing in Five Corners addresses a problem most homeowners don’t discover until a technician pulls back the insulation: separated joints, cracked collars on original flex duct, and gaps where galvanized connections have worked loose in unconditioned attics and crawlspaces. A typical sealing job in Five Corners runs $450 – $850 for a single system, depending on how many joints need attention and whether we need to remove decades of harvest dust buildup first.
Our crews use mastic sealant and metal-backed tape, not the hardware-store foil tape that peels off in three seasons. For homes with significant leakage, we’ll run a pressure test before and after so you can see the difference in hard numbers.
Source Removal Before Sealing
Five Corners sits in Washington’s hazelnut and grass-seed belt, so after harvest every open-window home pulls fine chaff into return boots and blower compartments. Sealing a joint over that buildup traps the debris and can restrict airflow worse than the original leak. We remove the source first with negative pressure and HEPA filtration, then seal.
Pressure Testing and Rebalancing
After sealing, we measure static pressure at the air handler and airflow at each register. Many Five Corners homes have supply and return ducts that were never properly balanced when the house was built. We adjust dampers and register boots so every room gets what it was supposed to.
Duct Repair in Five Corners
Duct Repair in Five Corners often starts with a homeowner complaint that sounds like a cleaning issue: “There’s dust everywhere, and the back bedroom never gets warm.” What we find is crushed flex duct in the attic, a disconnected return boot in the crawlspace, or a torn collar where original 1970s flex meets a galvanized trunk line. Duct repair in Five Corners typically costs $280 – $620 for localized fixes, or $800 – $1,400 if we’re replacing multiple runs of deteriorated flex duct.
We were called to a 1978 split-level off 299th Street where the homeowners had just replaced a blower motor for the third time. When we pulled the return boot, it was packed with hazelnut and grass-seed chaff, and a camera inspection showed two separated flex collars in the unconditioned attic. After source removal with negative pressure and HEPA filtration, we sealed the disconnected runs and re-balanced supply and return ducts at each register. The blower motor hasn’t been back.
Original Flex Duct Replacement
That 1970s flex duct tears at the collar when brushed, and the seal fails right where the harvest dust load is highest. We replace deteriorated runs with modern insulated flex or rigid duct where space allows, sealed with mastic at every joint.
Galvanized Connection Repair
Cool wet winters and hot dry summers work the sheet-metal connections loose in Five Corners attics. We reseat and seal these with mastic and mechanical fasteners, not tape alone, because tape adhesive fails where temperature swings are extreme.
Trusted Brands We Service in Five Corners
Our vans carry sealing and filtration products from Aprilaire, Abatement Technologies, and Guardsman, plus rotary brush systems from Rotobrush for the source-removal phase that often precedes sealing work in this market. We stock the common collar sizes, mastic types, and register boots needed for Five Corners’s ranch and split-level housing stock, so most jobs don’t wait on parts. If your system uses Honeywell or Aprilaire filtration components, we can inspect and reseat those connections as part of the sealing process.
Common Duct Sealing Problems We See in Five Corners Homes
- Harvest dust packed into return boots. The hazelnut and grass-seed chaff that blows through Five Corners every late spring and summer finds its way into every open window and HVAC return. We routinely find inches of compacted organic material blocking airflow before we ever reach the joint that needs sealing.
- Original 1970s flex duct torn at the collar. That early flex material degrades where it connects to metal trunk lines. The tear isn’t always visible until we run a camera, but it’s leaking conditioned air into your attic year-round.
- Joint separation in unconditioned attics and crawlspaces. Forty years of thermal cycling have worked the connections loose on galvanized duct runs. The gap might be small, but at 50 pascals of pressure, it’s bleeding your heating and cooling dollars into unused space.
- Brittle seals from dry winter indoor humidity. Five Corners winters run cool and damp outside, but indoor humidity drops low enough to dry out old duct tape and caulk. Agricultural dust moves straight through cracks that formed slowly enough no one noticed the pressure drop.
Pricing for Duct Sealing in Five Corners, WA
A typical HVAC duct sealing job in Five Corners runs $450 – $850 for a single system. Duct repair for localized issues like separated collars or crushed flex runs $280 – $620. If we’re replacing multiple runs of original 1970s flex duct across a full system, expect $800 – $1,400.
What moves the price: how many joints need sealing, whether source removal of harvest dust is required first, accessibility of attic or crawlspace runs, and whether we’re repairing or replacing deteriorated flex duct. Every job gets a written price before work starts. No per-vent pricing. No add-ons at the door. We also provide before-and-after photos of your own ducts so you can see what was done.
Call (361) 326-5060 for an exact quote. Estimates are free.
We Also Serve Cities Near Five Corners
Our crews work throughout the metro area, including Seattle, Spokane, Tacoma, and Vancouver. Scheduling and dispatch are coordinated from our Seattle office, with local crews serving each market.
Serving Five Corners, WA - Our Local Coverage Area
We’re based in the Five Corners 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 Five Corners
Because the harvest dust here is different. Normal cleaning removes debris from inside the ducts, but if the joints are separated or the collars are torn, new debris enters continuously and conditioned air leaks into your attic or crawlspace. Sealing fixes the pathway that lets both problems happen. Call (361) 326-5060 and we’ll inspect to tell you which issue you have.
We run a camera inspection and a pressure test. Disconnected ducts show visible gaps on camera and pressure readings below manufacturer spec. Dirty but intact ducts hold pressure and show debris without light leaks. We’ll show you both on screen before we recommend any work.
Sometimes, but often the flex itself is too deteriorated. That early material tears at the collar when disturbed, and the seal won’t hold on crumbling substrate. If the flex is structurally sound, we seal it. If it’s brittle or torn, we replace the run and seal the new connection properly.
Fall is ideal. The harvest dust has settled, temperatures are moderate for attic work, and you’ll enter heating season with sealed ducts instead of bleeding warm air into unconditioned spaces. Spring works too, before the first grass-seed chaff blows. We schedule year-round.
Yes, if the dust is entering through leaks in the return side. Return ducts under negative pressure pull attic air and crawlspace debris through gaps, then distribute it through your supply registers. Sealing those pathways stops the dust source. If the dust is internal household debris, sealing helps less, and we may recommend cleaning first. We’ll tell you which situation applies after inspection.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Five Corners and the greater metro area since 2004.