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 Canyon Lake
Duct sealing in Canyon Lake typically runs $350 – $850 for a whole-home system, with most rural and lakefront properties falling in the $450 – $650 range depending on accessibility and how much of the ductwork runs through unconditioned crawlspaces or attics. We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and our crews serve Canyon Lake from our San Antonio dispatch office. We’ve worked on everything from 1970s lake cabins off gravel roads in Canyon Lake Shores to newer custom builds on the north shore, and we know the local conditions that blow out duct seals here: limestone dust when the lake drops, flood-cycle dampness when it rises, and the extra loading that comes with heat pumps running hard through humid summers.
Call (361) 326-5060 for a free estimate. We’ll give you a written price before any work starts, and every seal is covered by our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Canyon Lake’s Preferred Duct Sealing Company
We’ve been in business since 2004, and our reputation in Canyon Lake is built on showing up when we said we would and pricing the job in writing before we touch anything. Roy Castellanos leads our operation, and he set the standard that every technician arrives uniformed, background-checked, and equipped to finish the job without a return trip.
Our response time to Canyon Lake is typically same-week, with scheduling coordinated from our San Antonio office so we’re not guessing drive times on Hill Country roads. We know the difference between a quick seal on accessible trunk lines in a newer home near Startzville and a crawlspace job on an original 1980s cabin where the flex duct has sagged onto the limestone soil.
What sets us apart from competitors who advertise in Canyon Lake but dispatch from Austin or San Antonio is that we account for local conditions in our scope. We check lake-facing returns for dust infiltration, we know which neighborhoods sit in flood-prone low spots where crawlspace humidity attacks mastic, and we carry the right width of foil tape and mastic for the flex duct sizes common in local housing stock.
Duct Repair in Canyon Lake
Duct Repair in Canyon Lake means fixing the physical damage that happens when flex duct sags in hot attics, when rodents chew through returns in crawlspaces, or when original installations separate at joints after decades of vibration. Most Canyon Lake homes we see need repair rather than full replacement, especially the 1970s – 1990s lake cabins and double-wides with original ductwork that was never properly supported. A typical Duct Repair job here runs $250 – $550 for localized fixes, or $600 – $1,200 if we’re replacing significant sections of deteriorated flex duct in a crawlspace or attic.
Separated Joints and Collar Leaks
The most common repair we make in Canyon Lake is reconnecting flex duct that has pulled away from the plenum or trunk line. Heat pumps cycle frequently here, and that vibration works collars loose over time. We reattach with mechanical fasteners, seal with mastic rated for wet locations, and support the duct so it doesn’t sag again.
Crawlspace Damage from Moisture and Pests
Canyon Lake’s flash-flood cycles leave crawlspaces damp for weeks after high water. That dampness softens duct insulation, and the resulting gaps attract rodents. We remove damaged sections, install new flex duct with proper vapor barrier, and seal all penetrations so the system draws conditioned air, not crawlspace air.
Air Duct Sealing in Canyon Lake
Air Duct Sealing in Canyon Lake is the preventive work that stops conditioned air from leaking into attics and crawlspaces, and stops unconditioned air from being pulled into your supply ducts. For a typical Canyon Lake home, whole-system sealing runs $350 – $850, with most lakefront and rural properties in the $450 – $650 range due to longer duct runs and more joints in crawlspace installations. We use mastic, foil tape, and aerosol sealant where appropriate, and we always verify our work with a pressure test so you can see the before-and-after leakage rate.
Sealing Before the Dry Cycle Hits
Canyon Lake duct sealing demand tracks the lake level itself. When the reservoir drops below 890 feet, dried shoreline limestone lifts as fine white dust that gets pulled into returns. Sealing leaks before that dry cycle keeps that limestone dust out of the whole system rather than just the filter. We time our preventive sealing recommendations around historical lake level patterns, and we check for the specific leak points that draw in exterior air.
Outbuilding and Detached Garage Systems
Rural Canyon Lake properties often have workshop or guest-house systems that share the main HVAC or run independent units. These ducts run through unconditioned space and get ignored for years. We seal them too, because they pull the same dusty gravel-road air and often run unattended, wasting energy and spreading dust.
Trusted Brands We Service in Canyon Lake
Our crews carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and we stock sealing products from Guardsman for jobs that need chemical-resistant mastic in damp Canyon Lake crawlspaces. That means no waiting on parts for standard residential systems. When we find a plenum penetration that needs more than tape, we’ve got the right product on the van. We also source filtration upgrades from Honeywell and Aprilaire for homeowners who want to add a layer of protection after sealing, especially in lakefront neighborhoods where the dust load is higher.
Common Duct Sealing Problems We See in Canyon Lake Homes
- Mastic bridging over unsupported flex duct. Previous owners or handymen slapped mastic and foil tape on duct that was never properly strapped. The seal looks fine in March. By August, that duct has sagged in a 130-degree attic and the seal cracks clean open. We support first, then seal.
- Plenum and collar leaks with open crawlspace returns. A tech seals the obvious leak at the air handler but leaves the crawlspace side drawing freely. Canyon Lake limestone dust and flood-cycle dampness still get pulled into supply and return ducts. We seal the envelope, not just the joint.
- Outbuilding systems skipped entirely. Rural tracts near Canyon Lake often have detached garages, workshops, or guest cottages with ductwork that hasn’t been touched in decades. These systems share the same dusty gravel-road air and often run unattended for months, leaking conditioned air and pulling in contaminants.
- Original 1980s – 1990s ductwork never sealed at installation. Many Canyon Lake cabins were built fast for weekend use, with flex duct simply pushed onto collars and held by friction. Forty years of heat pump cycling has worked every joint loose. We find and seal every penetration, including the ones buried in insulation.
Pricing for Duct Sealing in Canyon Lake, TX
A typical whole-home duct sealing in Canyon Lake runs $350 – $850. Most rural and lakefront properties fall between $450 – $650. What moves you within that range: how much ductwork is in unconditioned space (crawlspace and attic jobs take longer), how accessible the plenum and trunk lines are, and whether we’re sealing existing accessible duct or repairing damage first.
We do not quote per-vent prices. We quote one flat price per system, agreed in writing before work starts. That price does not change when we arrive. Factors that can increase cost: extensive crawlspace work requiring protective equipment, multiple outbuilding systems, or ductwork that needs repair before it can be sealed. We always inspect first and give you the full scope.
Call (361) 326-5060 for a free estimate. We’ll look at your system, show you where the leaks are, and give you a written price you can compare.
We Also Serve Cities Near Canyon Lake
Our crews regularly work in Canyon Lake and the surrounding communities: New Braunfels, Bulverde, San Marcos, and Schertz. If you’re on a rural tract between Canyon Lake and one of these towns, we route efficiently from our San Antonio office and don’t charge extra for the Hill Country drive.
Serving Canyon Lake, TX - Our Local Coverage Area
We’re based in the Canyon Lake 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 Canyon Lake
Every 3 – 5 years for rural Canyon Lake properties, or sooner if you notice dust rings around registers or uneven heating and cooling. Unpaved roads kick up more particulate than paved suburban streets, and that loading works on seals faster. After a particularly dry summer with low lake levels, check your returns for white limestone dust buildup. Call (361) 326-5060 and we’ll inspect for free.
Yes. When Canyon Lake drops below 890 feet, exposed shoreline limestone dries and sends fine white dust into the air that gets pulled into duct systems through leaks. When fall and spring floods refill the canyon, that same dust turns to damp silt that cakes onto flex duct and plenum joints. Sealing before the dry cycle prevents both problems. We can time preventive maintenance around historical patterns.
Yes, significantly, if the dust is coming from your attic or crawlspace rather than your living space. In Canyon Lake, we commonly find that white limestone dust around registers is pulled in through leaks in return ductwork running through unconditioned space. Sealing those returns stops the infiltration at the source. We verify with before-and-after photos of your own ducts so you can see the difference.
Usually yes, if the duct is physically intact. Original flex duct from that era in Canyon Lake was often installed without proper support or sealing, so the system leaks 20 – 30% of conditioned air into the crawlspace. Sealing and supporting that existing duct can recover most of that efficiency for far less than replacement. If the duct is crushed, water-damaged, or chewed, we’ll tell you and quote repair or replacement separately.
Yes. We seal any ductwork that moves conditioned air, including shop systems, guest-house mini-split duct runs, and detached garage HVAC in rural Canyon Lake properties. These systems often leak the worst because they’ve been ignored longest. We quote them as separate systems if they have independent air handlers, or as extensions of the main system if they share equipment. Call (361) 326-5060 for scope and pricing.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Canyon Lake and the Hill Country since 2004.