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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After
Before
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Before
AfterFast, Reliable Duct Sealing Across Maplewood
Duct sealing in Maplewood typically runs $450 – $1,200 for a whole-home system, with most ranch and split-level houses falling in the $650 – $900 range. We can usually inspect and quote within a day or two, and sealing work itself takes one visit for most homes. Our crews are already working the Olympia corridor regularly, so getting to Maplewood doesn’t involve the scheduling delays you might hit with outfits based up toward Tacoma or across in Seattle.
We’ve been sealing ducts in this pocket of south Puget Sound long enough to know the local pattern: original galvanized ductwork from the 1960s through 1980s, long crawlspace runs that sag and separate at the joints, and that particular Pacific Northwest combination of high humidity and heavy pollen that makes leaky ducts worse here than in drier climates. When your conditioned air escapes into a damp Maplewood crawlspace, you’re not just losing money on your power bill. You’re pulling unfiltered, humid outside air back into the house through every gap, carrying cedar pollen, fir needles, and the mold spores that thrive in our maritime winters.
Our Duct Sealing team works from our Seattle dispatch office, but the crews serving Maplewood live and work this territory. They know the difference between the wooded lots west toward the Olympia city limits and the more open parcels east toward Lacey, and they know which neighborhoods have the tight crawlspaces that make duct access a real challenge. Call (361) 326-5060 and we’ll get you a written quote before any work starts.
Why Hollis Air Duct Cleaning Is Maplewood’s Preferred Duct Sealing Company
Maplewood homeowners call us back because we show up inside the window, price the job in writing, and leave the site clean. That’s The Garrison Standard, and it’s how every Hollis crew operates. No estimates that balloon once we’re in your crawlspace. No “we found another problem” surprises at the door. The price we write down is the price you pay.
Our technicians are background-checked and uniformed, and you’ll know who’s coming before they arrive. We use professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, the same tools commercial HVAC crews rely on, not hardware-store patch kits. And every duct sealing job we do in Maplewood carries our 365-Day Done Right Promise: if the seal fails or the leak returns within a year, we come back and make it right at no charge, including a free second visit if needed.
Phones are answered by a live person 24 hours a day, seven days a week. No voicemail loops, no callback queues, no waiting until Monday morning to schedule. When you’re dealing with ducts that are pumping heated air into a wet crawlspace in January, that matters.
We also handle Air Duct Cleaning in Maplewood and Dryer Vent Cleaning in Maplewood, so if your inspection turns up multiple issues, one crew can handle it without coordinating separate visits from different outfits.
Duct Sealing Services in Maplewood
Duct Sealing Services in Maplewood address the specific failure points we see in this market: separated joints in original galvanized trunk lines, gaps where flex duct connects to rigid pipe, and leaks around plenum boxes that have worked loose after decades of thermal expansion in our damp climate. Most Maplewood homes built between 1960 and 1985 have duct systems that were never designed to be airtight by modern standards. They were built to move air, not to conserve it, and forty years of vibration, humidity cycling, and the occasional rodent in the crawlspace have made them leakier than ever.
We seal with mastic compound and fiberglass mesh for rigid ductwork, and with proper UL-rated foil tape and mechanical clamps for flex connections. Not duct tape, never duct tape. That silver roll from the hardware store dries out and fails in our humid crawlspaces within a season. Our materials are rated for the conditions they’ll actually face in your Maplewood home.
Whole-System Pressure Testing
Before we seal anything, we pressurize your duct system and measure the leakage with a calibrated fan and manometer. This gives us a baseline in CFM25, cubic feet per minute of leakage at 25 Pascals of pressure, so you know exactly what we started with and what we achieved. Most unsealed Maplewood homes test between 300 and 600 CFM25. We typically reduce that by 75 – 90 percent.
Crawlspace Joint and Seam Repair
The long, low-clearance crawlspace runs common in Maplewood ranch houses are where we find the worst leakage. Galvanized duct sections settle, joints pull apart, and the seams between trunk line and branch ducts open up. We crawl it, we find it, we seal it properly, and we photograph the before and after so you can see what was done without having to belly-crawl yourself.
What happens when you call
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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.
Duct Insulation in Maplewood
Duct Insulation in Maplewood is often the companion to sealing, and sometimes it’s the more urgent need. In our climate, uninsulated or poorly insulated ducts running through vented crawlspaces lose massive amounts of heat in winter and gain humidity in summer. Even sealed ducts will sweat in July if they’re carrying 55-degree conditioned air through 75-degree humid crawlspace air, and that condensation feeds the mold and mildew problems that are already common in Maplewood’s older homes.
We install wrapped fiberglass insulation with a vapor barrier for rigid ductwork, and replace degraded flex duct with properly insulated flex where the existing material has collapsed, torn, or lost its R-value to moisture damage. Most Maplewood homes need R-6 or R-8 insulation on crawlspace ducts to meet current energy code, and many have zero insulation or insulation that has fallen off and lies sodden on the ground.
Condensation and Mold Prevention
Sweating ducts in Maplewood crawlspaces create a cycle: moisture breeds mold, mold degrades air quality, and homeowners crank the system harder to compensate for lost efficiency, which makes the ducts sweat more. Proper insulation breaks that cycle. We size it right for your system and your crawlspace conditions, not just wrap and hope.
Insulation Replacement for Water-Damaged Runs
In the wettest pockets of Maplewood, particularly the wooded lots west toward Olympia where drainage is slower, we’ve pulled off insulation that’s been saturated for years. It weighs three times what it should and contributes nothing to efficiency. We remove it, clean the duct surface, seal any leaks we’ve exposed, and install new insulation that will actually perform.
Trusted Brands We Service in Maplewood
Our equipment comes from manufacturers who build for the commercial market: Rotobrush rotary brush systems for mechanical cleaning, Nikro negative-air machines for containment and extraction, and filtration and sealing products from Abatement Technologies and Guardsman. We stock mastic compounds, fiberglass mesh, UL-rated tapes, and replacement flex duct in our local inventory, so most Maplewood jobs don’t wait on parts. When a crew arrives at your home, they have what they need to complete the work that day. That’s part of The Garrison Standard too: arrive prepared, finish what you started, don’t make the homeowner schedule a return visit because you were short a roll of proper tape.
Common Duct Sealing Problems We See in Maplewood Homes
- Original galvanized trunk lines with separated joints. The rigid steel ductwork in 1960s – 1980s Maplewood ranches was joined with simple slip-fit connections and a few screws. Decades of vibration and thermal cycling have opened gaps at every joint, and the humid crawlspace air accelerates corrosion at the seams.
- Flex duct collapsed or torn at connections. Where original flex duct was used for branch runs, the plastic vapor barrier degrades in our damp climate. We’ve found flex duct in Maplewood crawlspaces that’s literally hanging by a wire tie, blowing conditioned air into the dirt.
- Return air leaks pulling in crawlspace air. In split-level homes common east of the main corridor, return ductwork often runs through the lower level crawlspace. When these leaks pull, they’re not just losing efficiency, they’re actively drawing mold spores, pollen, and whatever else is living in that damp space directly into your breathing air.
- Outdoor air intakes clogged with fir needles and cedar debris. This is the Maplewood signature problem. Homes west of the wooded corridors near the Olympia city limits have intake grilles that are basically pollen traps from March through June. The restricted airflow makes the system work harder, increasing pressure at duct joints and making existing leaks worse.
Pricing for Duct Sealing in Maplewood, WA
A typical whole-home duct sealing in Maplewood runs $450 – $1,200, with most homes in the $650 – $900 range. Smaller ranch houses with accessible crawlspaces and straightforward joint sealing tend toward the lower end. Larger split-levels with multiple zones, extensive flex duct replacement, or difficult crawlspace access can push toward the higher end. Duct insulation added to sealing typically adds $300 – $700 depending on linear footage and R-value needed.
What moves the price: the linear feet of ductwork, the percentage of rigid versus flex duct, crawlspace accessibility, whether we need to remove and replace water-damaged insulation, and whether the system needs repair beyond sealing (disconnected runs, crushed duct, etc.). We don’t do per-vent pricing or teaser coupons that turn into something else at the door. One flat price per system, agreed in writing before we start, based on what we find during inspection.
Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Maplewood
Our crews work throughout the south Puget Sound region. We regularly handle Duct Sealing in Maplewood and surrounding communities, including Seattle, Spokane, Tacoma, and Vancouver. Scheduling is coordinated from our Seattle dispatch office, with local technicians assigned to minimize travel time and keep appointments reliable.
Serving Maplewood, WA - Our Local Coverage Area
We’re based in the Maplewood 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 Maplewood
We typically schedule inspections within one to two business days for Maplewood homeowners, and sealing work itself is usually completed in a single visit. Call (361) 326-5060 to check current availability.
Yes, we work across Maplewood including the wooded lots west toward the Olympia city limits and the more open areas east toward Lacey. The tight crawlspaces in the older ranch neighborhoods and the multi-level homes near the commercial corridors are both familiar territory for our crews.
We don’t use the word “emergency” for scheduled maintenance work, but our phones are answered by a live person 24/7 and we will prioritize situations where a duct failure has left a home without heat in winter or where return air leaks are pulling in actively wet crawlspace air. Call (361) 326-5060 and we’ll assess the urgency honestly.
Maplewood pricing is generally comparable to Olympia and Lacey, slightly lower than Seattle due to shorter travel times for our crews. The bigger variable is your home’s specific duct configuration, not your ZIP code. A 1970s ranch in Maplewood with accessible crawlspace will typically cost less to seal than a similar home in Seattle with foundation-level ductwork.
Every duct sealing job is covered by our 365-Day Done Right Promise in writing. If the seal fails, the leak returns, or any covered workmanship issue develops within one year, Hollis returns and makes it right at no charge, including a free second visit if needed. The warranty is tied to the work, not the location, so it travels with you if you sell the home and is fully transferable.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Maplewood since 2004.