Ductwork Installation in San Antonio: Fix Airflow Problems for Good
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What’s Covered on This Page
- Signs Your Ductwork Needs Replacing, Not Just Repair
- Installation vs. Repair vs. Cleaning: Which One You Need
- How Home Size and Layout Drive Ductwork Costs
- What Happens During a Full Ductwork Installation
- Verifying the Job Was Done Right
- How much does ductwork installation cost in San Antonio?
- How do I know if I need duct repair or full ductwork installation?
- How long does a full ductwork replacement take?
- Is duct cleaning the same as ductwork installation?
- Why do some rooms in my San Antonio home never cool evenly?
- What happens during a full ductwork installation appointment?
Signs Your Ductwork Needs Replacing, Not Just Repair
Here’s the honest answer. Many San Antonio homes need duct repair, not a full replacement. If you have one section of flex duct chewed through in the attic, or a plenum seam that opened up, that’s a repair job. We see this every week and it doesn’t mean tearing everything out.
How do you know when it’s gone past repair? Age is the first clue. Homes built before the 2000s in San Antonio often still have the original duct board or flex duct. That material breaks down over 20 to 25 years. The insulation flakes off, the vapor barrier cracks, and the duct itself starts sagging in the attic.
- Ductwork that’s crushed, kinked, or sagging in multiple spots across the attic, not just one section
- Visible mold or a musty smell coming from the vents when the system starts
- Rooms that never cool or heat right no matter how many times you’ve had the system serviced
- Duct board that’s soft, crumbling, or pulling away from the metal frame when touched
- A jump in your energy bill that your HVAC company traces back to major duct leakage, not the equipment itself
One thing we notice on inspections a lot: homeowners patch the same duct leak two or three times over a few years before calling about replacement. If a repair keeps failing in the same spot, that’s your ductwork telling you it’s done.
Installation vs. Repair vs. Cleaning: Which One You Need
Not every duct problem needs full ductwork installation. We get calls where someone is convinced they need all new duct work, and it turns out to be one crushed flex run behind a closet wall. Let’s sort this out before you spend money on the wrong fix.
A repair makes sense when the duct system itself is still in decent shape. Maybe a squirrel got into the attic and tore through a flex run. Maybe one plenum seam opened up and you’re losing air into the attic instead of the room. Those are fixable without tearing the whole system out. A duct cleaning is about what’s built up inside the ducts, not the condition of the ducts themselves. Dust, pet hair, and debris in the lines don’t mean the ductwork is failing.
Full ductwork installation is the right call when the system is old, undersized, or falling apart in more than one spot. If we pull back attic insulation on an older San Antonio home and find flex duct that’s crushed, disconnected, or crumbling at the seams in multiple rooms, patching it is a short term fix. You’d be paying for repairs every year or two instead of solving it once.
- Rooms that never cool evenly, no matter how the thermostat’s set
- Ductwork that’s original to the house and 20 plus years old
- Visible sagging, disconnected sections, or crushed flex duct in the attic
- A system that’s been patched more than once already
- Airflow that’s weak at nearly every register, not just one or two
If you’re not sure which category you fall into, that’s fair. It’s why we walk the attic and check the whole run before telling you what you need, and it’s part of the free estimate. If you want to see how duct work fits into a full home system check, take a look at our main service page for a broader view of what we cover.
How Home Size and Layout Drive Ductwork Costs
Here’s the honest answer: square footage is the biggest factor. A bigger home means more rooms, and more supply runs needed to push air where it needs to go. A small one-story home might only need six or seven duct runs. A sprawling two-story can need double that, plus longer returns to get air back to the system.
We size every job off the home’s layout, not a flat rate. That’s why we don’t quote over the phone without seeing the attic or crawl space first. Free estimates exist for this exact reason. We need eyes on the ductwork before we can give you a real number.
- An 800 sq ft home runs around $3,900 to replace all the ductwork
- A 1,200 sq ft home is closer to $4,500
- A 1,600 sq ft home lands around $5,500, our most common job size
- A 2,000 sq ft home runs around $6,500
- A 2,500 sq ft home is around $7,500
- A 3,000 sq ft or larger home is around $8,500 and up
Layout matters too, not just square footage. A one-story ranch with a simple attic run is easier than a two-story home with ductwork split between an attic and a closet chase. Homes built in the 1970s and 1980s around San Antonio often have ductwork crammed into tight attic spaces with sharp turns. Sharp turns choke airflow, so we sometimes reroute a run entirely instead of just replacing it in the same path.
Most of our jobs fall into the 1,600 square foot range, full flex duct replacement with new supply and return plenums built from duct board.
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What Happens During a Full Ductwork Installation
What does a full ductwork installation look like once a crew shows up at your house? It’s not just swapping out a few flex ducts. Here’s the real sequence we follow on almost every job in San Antonio.
- We pull the old ductwork out first. Both the flex duct runs and the old supply and return plenums come out completely, not patched around.
- We build new supply and return plenums out of duct board, sized for your home’s actual airflow needs.
- New flex duct gets run to every room. We install a manual damper on the supply plenum so airflow can be balanced later.
- New register boxes and grilles go in at each vent location.
- Every joint and seam gets sealed. This step gets skipped more than people realize, and it’s the reason ducts leak air into attics.
- We test static pressure and airflow to confirm the HVAC system is working as it should with the new ductwork.
- Before we leave, we walk the job with you and explain how the new system runs.
That last step matters more than most homeowners expect. We’ve had customers who never knew their thermostat had a fan setting worth using, or that one register was closed the whole time by a previous owner. A few minutes of explanation saves a callback later.
Most jobs take one to two days depending on the size of the house and how the attic is laid out. Steep rooflines and tight attic access in older San Antonio homes can add time. Crews have to work in cramped spaces to route new duct runs. We give you a free estimate before any work starts, so you know the scope of the job and what’s included before anyone touches your ductwork.
Verifying the Job Was Done Right
Here’s the thing most homeowners don’t know to ask about. New duct work can look great and still be wrong. Shiny flex duct, clean registers, no visible tears – and the system still doesn’t move air right. Finishing the job means more than hanging duct board and calling it done.
Before we consider a job finished, we check static pressure at the air handler. This tells us if the system is breathing as it should. Too much resistance in the duct system means your AC unit works harder than it should, wears out faster, and never quite cools the back bedrooms. We also walk every supply and return, checking that seals are tight at the plenum connections and boots. A duct that’s 95% sealed still leaks enough conditioned air into your attic to raise your bill every month.
- Static pressure reading matched to your system’s rated specs
- Airflow check at each register, room by room, not just near the return
- Visual and hand-check of seals at plenums, boots, and joints
- Damper positions confirmed on the supply plenum
- Thermostat response tested after the system runs a full cycle
Once that’s done, we sit down with you and walk through what changed. You should be able to tell us which rooms feel different, and we should be able to explain why. If a tech hands you an invoice and leaves without touching a manometer or explaining static pressure, something got skipped.
San Antonio summers push AC systems hard for months. A duct system that’s marginal in April usually shows its problems by July. That’s when the verification step either pays off or the callback happens.
Frequently Asked Questions
Common questions about Ductwork installation
How much does ductwork installation cost in San Antonio?
Cost depends mostly on your home’s square footage and attic layout, not a flat rate. A small one-story home needs fewer supply runs than a two-story house with a split attic and closet chase. Older homes from the 1970s and 1980s often have tight attic spaces with sharp turns, which can add labor. We walk the attic first and give you a free estimate based on your actual home, not a phone guess.
How do I know if I need duct repair or full ductwork installation?
It depends on how much of the system is failing, not just one problem spot. If it’s a single crushed flex run or one open plenum seam, that’s usually a repair. Full installation makes sense when duct board is crumbling in multiple rooms, ductwork is over 20 years old, or you’ve already patched the same leak two or three times. We check the whole attic run before telling you which one you need.
How long does a full ductwork replacement take?
Most full ductwork installations take one to two days depending on your home’s size and layout. A small one-story home with simple attic access moves faster than a two-story house with ductwork split between an attic and a closet chase. Older San Antonio homes with cramped attic spaces sometimes need extra time for rerouting runs around sharp turns. We’ll give you a realistic timeline once we’ve seen your attic in person.
Is duct cleaning the same as ductwork installation?
No, these solve two different problems. Duct cleaning removes dust, pet hair, and debris built up inside ducts that are otherwise in good shape. Ductwork installation replaces the ducts themselves when they’re crushed, sagging, or crumbling. A clean system can still have failing ductwork underneath, and a newly installed system can still get dusty over time. If your ducts are structurally fine, cleaning solves it. If they’re falling apart, cleaning won’t fix that.
Why do some rooms in my San Antonio home never cool evenly?
Uneven cooling almost always traces back to airflow problems in the ductwork, not the equipment. Sharp turns in older ductwork, crushed flex duct, or an undersized duct run can choke airflow to specific rooms. This is common in San Antonio homes from the 1970s and 1980s where ducts were crammed into tight attic spaces. If a room has never cooled right no matter how many times you’ve serviced the system, the ductwork itself is likely the cause.
What happens during a full ductwork installation appointment?
We pull out all the old ductwork first, including flex duct runs and both plenums, rather than patching around them. Then we build new supply and return plenums sized for your home’s actual airflow needs, run new flex duct to every room, and install a manual damper for balancing later. New register boxes and grilles go in at each vent. It’s a full system replacement, not a partial swap of a few pieces.
