Attic Air Sealing Cost - Same-Day Service, Done Right the First Time

How Much Does Attic Air Sealing Cost in Schertz?

Attic air sealing in Schertz, TX typically costs between $850 and $2,400 for a standard single-story home, with most jobs landing around $1,200 to $1,600 when the attic is accessible and the existing insulation doesn’t need to be fully removed first. That range covers labor, materials (typically two-part spray foam and caulk for top plates and penetrations), and a blower-door test – a pressurization reading that shows, in one number, how much air your building envelope is losing before and after the work.

Homes in Schertz with vaulted ceilings, knee walls, or older can-light fixtures scattered across the ceiling plane tend to sit at the higher end of that range. If you’re starting from scratch – no existing insulation, clean attic deck – the job usually goes faster and costs less than pulling back settled blown-in insulation to reach the top plates underneath.

Attic Air Sealing Cost Breakdown (2026)

Most Attic Air Sealing services quotes bundle labor and materials into a single project price. Here’s how a typical Schertz job breaks down by scope:

These numbers reflect what we actually see on invoices in Schertz and surrounding Guadalupe County. Prices here can run slightly lower than in central San Antonio because drive time is shorter for contractors based in the area, but material costs track closely with the broader San Antonio metro. One thing that consistently pushes a Schertz job toward the higher end: homes built in the 1990s and early 2000s in subdivisions like Northcliffe, Dove Meadows, and Savannah Square often have recessed can lights scattered throughout the main living ceiling – and those cans, if they’re the older non-IC-rated type, require fire-rated boxes before sealing. A home with 18 or 20 of those fixtures adds meaningful time and material to any quote.

The other Schertz-specific factor is attic depth. Many homes in this market were built with 2×4 top plates and minimal heel height at the eaves, which limits how deeply a contractor can work near the perimeter without causing damage. That tight access at the edges is where most of the air moves – warm attic air leaking into the wall cavity, or conditioned air escaping through unsealed sill plates – and it takes a crew that knows how to work in that space without compressing existing insulation or missing the perimeter band entirely.

Written Price Before Work Starts – Every Time

Under the Haven Standard, Wes Okafor and the Envelope Insulation Co. team operate on one non-negotiable: a flat written price, written scope, and written warranty are in your hands before anyone touches your attic. Haven Standard Clause 1 exists because a verbal estimate is not a price – it’s an opener for revision. Every number in the table above reflects real job data, but your specific quote will be fixed before work begins, not estimated after.

What Affects Attic Air Sealing Pricing in Schertz

• Home size and ceiling square footage. Air sealing is priced largely by labor hours, and labor hours scale with how much ceiling plane the crew has to cover. A 1,600 sq ft single-story ranch in Schertz Farms takes roughly half the time of a 3,000 sq ft two-story with complex framing. Quote in hand, you can verify whether the contractor measured your actual attic floor or just used the home’s exterior footprint – those numbers are not the same.
• Number and type of ceiling penetrations. Every wire, pipe, HVAC chase, exhaust fan, and recessed light is a potential air bypass. A Schertz home built between 1998 and 2010 with 16 or more recessed cans will require significantly more material and time than a newer build using airtight LED wafer lights. Count your can lights before you call – it helps calibrate any estimate immediately.
• Existing insulation depth and condition. If there’s already 10 to 14 inches of blown-in fiberglass or cellulose over your top plates – which is common in Schertz homes where insulation has been added over the years without air sealing – the crew has to pull that material back to reach the wood framing, seal it, and replace it. That adds cost. It’s also why Envelope will never blow new insulation over an unsealed attic floor: you’d be locking the problem in place.
• Attic accessibility and configuration. Low-slope rooflines, HVAC equipment sitting in the middle of the attic floor, or pull-down stairs that barely clear the hatch frame all slow the work. Some Schertz homes from the mid-2000s have a secondary attic over a bonus room or garage that requires separate entry – that adds time and may add cost.
• Blower-door testing requirement. If you want documented before-and-after numbers – and you should, because that’s the only way to verify the sealing actually worked – the test adds roughly $150 to $350 to the project. Envelope publishes those numbers on every applicable job. A contractor who skips testing isn’t selling you proof; they’re asking you to take their word for it.
• Schertz summer heat load and attic temperatures. This is worth naming directly. Attic temperatures in Schertz routinely exceed 140 degrees Fahrenheit from May through September. That thermal load means any air leak – even a small gap around a top plate – is pushing superheated air directly into your conditioned envelope. The sealing materials used have to be appropriate for high-heat environments: closed-cell two-part foam at penetrations, not open-cell or latex caulk that can shrink or off-gas. Material selection affects both performance and price.

How to Save on Attic Air Sealing

Bundle Air Sealing with an Insulation Upgrade

The single most reliable way to reduce the per-project cost of attic air sealing in Schertz is to combine it with an insulation upgrade in one visit. Air sealing has to happen first – that sequencing is non-negotiable, because insulation that goes in before sealing is doing a fraction of its rated job – but when both scopes are on the same work order, the mobilization cost, the blower-door test, and the crew setup time are shared across both line items. Bundled jobs in the Schertz market typically save homeowners $300 to $600 compared to scheduling the two scopes separately.

Use a Free Second Opinion Before You Commit

Envelope offers a free second opinion on any written estimate. Bring a competing quote – a real written scope, not a verbal number – and Wes Okafor’s team will read it with you line by line. That matters because not every air sealing quote in the Schertz market covers the same scope. Some skip the perimeter band. Some don’t include can-light boxes. Some quote “sealing” and mean caulk at visible gaps rather than two-component foam at top plates. Reading the scope with a second set of eyes costs nothing and can clarify a $400 price difference in about 15 minutes.

Check for Texas and Federal Efficiency Incentives

As of 2026, the federal 25C tax credit applies to weatherization work including air sealing, up to 30% of the project cost with a $1,200 annual cap on weatherization improvements. That credit does not require a specific contractor or product – it requires a qualified expenditure and documentation. CPS Energy, which serves portions of the Schertz service area, has also run rebate programs for air sealing work in the past; check current offerings before your project date because program availability changes seasonally. Your contractor should be able to provide the documentation you’ll need to claim any applicable credit.

Don’t Wait Until Summer

Scheduling attic work in Schertz between October and February is both safer for the crew and faster to complete, because an attic at 75 degrees is a very different working environment than one at 140. Contractors in this market are generally less booked in the winter months, which means your project date is more flexible and there’s less scheduling pressure. The work itself costs the same either way, but off-peak scheduling reduces delays and keeps the project on track.

Ask What’s Included in Writing Before Signing

This applies to any Schertz contractor, not just Envelope. A low quote that excludes can-light boxes, attic hatch sealing, and the blower-door test is not actually a lower price – it’s a lower scope. Haven Standard Clause 1 exists to prevent this: your written price includes a written scope, so you know exactly what’s covered before the crew arrives. When comparing quotes, ask each contractor whether blower-door testing, can-light covers, and perimeter plate sealing are included or billed separately.

For a free estimate specific to your Schertz home’s attic configuration – including a written price you can compare against any other quote – call Topside Attic Insulation Schertz at (830) 402-5240. A live person answers.

FAQs – Attic Air Sealing Cost in Schertz

How much does attic air sealing cost in Schertz, TX?

Most Schertz homeowners pay between $1,100 and $1,800 for attic air sealing on a typical 1,600 to 2,400 square foot single-story home. Smaller homes under 1,400 square feet can come in closer to $850, while larger homes with many recessed lights or complex attic layouts can reach $2,400 or more. The best way to nail down your number is a written quote that lists the specific scope – top plate sealing, penetration sealing, can-light covers, and blower-door testing – as separate line items so you can see exactly what you’re paying for. Call (830) 402-5240 for a free written estimate.

Is attic air sealing worth it in Schertz’s climate?

Yes, and the math is straightforward in a hot climate. Schertz sits in Bexar and Guadalupe County, where cooling loads run from April through October. An unsealed attic with a blower-door reading of 4,000 CFM50 – CFM50 being the cubic feet per minute of air moving through your envelope at 50 Pascals of pressure, which is roughly the wind load of a 20 mph storm – can add $40 to $90 per month to a Schertz home’s summer utility bill. A properly sealed attic, documented with before-and-after blower-door numbers, typically shows a 30% to 50% reduction in air leakage rate. At average CPS Energy rates, that pays back the sealing cost in two to four cooling seasons. The documentation also matters at resale: a Schertz buyer who sees a blower-door report with verified numbers is looking at evidence, not a promise.

How long does attic air sealing take in a Schertz home?

A standard Schertz home between 1,600 and 2,200 square feet takes 4 to 8 hours for a two-person crew to seal properly, including setup, sealing all top plates and penetrations, covering can lights, and running the blower-door test at the end. Homes with more complex framing, attic HVAC systems, or significant existing insulation that needs to be pulled back and replaced can run a full day. The blower-door test itself adds roughly 30 to 60 minutes and should happen after sealing is complete – not before, not skipped. If a crew quotes you a two-hour turnaround on a 2,400 square foot attic, ask them to walk you through exactly what they’re covering in that time.

Can I do attic air sealing myself to save money?

You can seal some penetrations yourself – caulking around small electrical boxes or using foam backer rod on obvious gaps – but the high-value work in a Schertz attic happens at the top plates, the wall cavities, and around HVAC chases, and it requires two-component closed-cell spray foam applied correctly at those junctions. Two-part foam is a controlled chemical reaction; if the mix ratio is off, the foam won’t cure properly and won’t hold. Can-light covers also need to be fire-rated and installed to code. The bigger issue is that without a blower-door test before and after, you have no way to know whether your effort moved the needle. Verified before-and-after numbers are what separate a completed air-sealing project from a partial one. Most Schertz homeowners find that DIY sealing addresses 20% to 30% of the leakage and leaves the rest untouched because the significant bypasses are hidden under insulation at the plate line.

Does attic air sealing qualify for any tax credits or rebates in Texas?

Yes. As of 2026, the federal 25C Nonbusiness Energy Property Tax Credit covers 30% of attic air sealing costs, up to a $1,200 annual cap for weatherization improvements combined. On a $1,400 Schertz project, that’s up to $420 back at tax time. The credit requires documentation – specifically, itemized receipts and sometimes a product certification. CPS Energy has also offered air sealing rebates at various points; those programs change, so check the current CPS Energy residential rebate page before your project date. Envelope provides the written scope and documented photo record needed to support any applicable credit claim. Call (830) 402-5240 to ask what documentation will be included with your project.

Why Schertz Homes Leak More Than You’d Expect

Schertz grew fast. A large portion of the housing stock here – particularly in the Northcliffe, Dove Meadows, Carolina Crossing, and Savannah Square neighborhoods – was built during the Texas construction surge of the late 1990s and mid-2000s. That era of homebuilding prioritized speed and square footage over building envelope performance. Top plates were rarely foam-sealed before drywall went up. Can lights were installed in volume with no fire-rated covers and no air barrier between the fixture housing and the attic. HVAC chases were framed and left with gaps at the ceiling line large enough to see daylight through.

Those gaps weren’t visible to the buyer at closing and they’re not visible today under a foot of blown-in insulation. But they’re there. And every summer, when Schertz attic temperatures climb past 140 degrees, that superheated air finds every gap and pushes into your conditioned space. Your air conditioner compensates by running longer. Your utility bill rises. And the insulation that someone paid to have upgraded ten years ago is doing half its rated job because the air isn’t being stopped before it reaches the insulation layer.

This is the sequencing problem Envelope was built around: air sealing first, then insulation – in that order, documented with blower-door numbers so the homeowner can see what actually changed. If you’ve had insulation added to your Schertz attic in the last decade and your utility bills didn’t drop the way you expected, there’s a reasonable chance the sealing step was skipped.

What You Should Receive When the Job Is Done

When Wes Okafor’s crew completes an air sealing job in Schertz, the homeowner walks away with specific documentation. This is what the Haven Standard looks like in practice, and it’s worth knowing before you hire anyone:

• Written scope of work – delivered before the crew starts, not after. It lists every location sealed: top plates, plumbing penetrations, electrical penetrations, HVAC chases, can-light covers, attic hatch.
• Blower-door readings – before and after. A number like “4,200 CFM50 before sealing, 2,600 CFM50 after” tells you specifically how much air movement was reduced. Percentage improvement is secondary; the raw numbers are what you’d present to a home energy auditor, a buyer, or a rebate program administrator.
• Documented photo record. Photos of the attic before sealing, photos of key sealing locations during work, and photos of the finished attic. Included on every job – not available on request, just included.
• Written warranty. The 365-Day Done Right Promise: if it’s not done right, we make it right. That’s in writing before the crew leaves.

These aren’t extras. They’re the baseline. A contractor who can’t tell you the blower-door reading on your attic after sealing hasn’t given you a way to verify the result. Documentation is the product – the sealing is how you earn it.

Attic Air Sealing vs. Attic Insulation: Do You Need Both?

This question comes up on almost every estimate call. The short answer: air sealing and insulation solve different problems, and one done without the other leaves you with a partial fix.

Insulation is a thermal barrier – it resists the transfer of heat through the ceiling. But insulation is not an air barrier. Blown-in fiberglass or cellulose at R-38 (roughly 12 to 14 inches of depth) slows conductive heat transfer well, but it doesn’t stop air from moving through it. Air sealing is an air barrier – it stops bulk air movement through gaps and cracks. The two systems work together: air sealing reduces the load, and insulation addresses what gets through after the bulk movement is stopped.

If your Schertz home has adequate insulation depth already (R-38 or higher is the current IRC recommendation for climate zone 2, which covers Guadalupe County), you may need air sealing without an insulation upgrade. If your insulation is below R-30, you likely need both. A blower-door test before any work starts – which we include as part of a full Attic Air Sealing in Schertz project assessment – tells you which problem is larger and where to put the budget first.

You can read more about Envelope Insulation Co.’s full building-envelope approach, including how each service fits together, on our home page.

Key Takeaways

• Attic air sealing in Schertz, TX costs $850 to $2,400 for most homes, with the typical range landing between $1,100 and $1,800 for a 1,400 to 2,400 sq ft single-story.
• Older Schertz subdivisions (Northcliffe, Dove Meadows, Savannah Square) often have 16 to 24 recessed can lights that each require fire-rated boxes – a real cost driver that varies significantly by home.
• Bundling air sealing with a blown-in insulation upgrade typically saves $300 to $600 compared to separate visits.
• The federal 25C credit covers 30% of qualifying air sealing costs, up to $1,200 annually – on a $1,400 job, that’s up to $420 back.
• A blower-door test – before and after – is the only way to document that sealing actually worked. Any contractor who skips it is asking you to take their word for it.
• Air sealing must happen before insulation is added. Blowing insulation over an unsealed attic floor locks the problem in place.
• Under the Haven Standard, you receive a written price, written scope, written warranty, and documented photo record on every job – before and after, not on request.

Get a Written Price for Your Schertz Attic

If your Schertz home was built between 1990 and 2012 and hasn’t had the attic air sealed since construction, there’s a high probability the sealing was either minimal or skipped entirely. The only way to know for certain is a blower-door reading – a number, not an opinion. Envelope Insulation Co. has completed air sealing projects on 9,000+ homes since 2016, every one of them starting with a written price and ending with documented before-and-after numbers.

Wes Okafor leads every assessment with the same starting point: measure first, quote second, seal third. No work starts without a flat written price in your hands. No job closes without a photo record and blower-door readings you can keep.

Call Topside Attic Insulation Schertz at (830) 402-5240 to schedule a free estimate. A live person answers – no voicemail loop, no callback window measured in business days. Bring any competing written estimate and we’ll read it with you before you decide.

Pricing reflects the Schertz, TX market as of 2026. Topside Attic Insulation Schertz offers free estimates – call (830) 402-5240.

Written by Wes Okafor, Owner at Envelope Insulation Co., serving Schertz, TX since 2016.