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How Much Does a Home Energy Audit Cost in Seguin?

A professional home energy audit in Seguin, TX typically runs between $250 and $650 for a full diagnostic visit that includes a blower-door test, thermal imaging scan, and a written report. Most single-family homes in Seguin fall in the $300-$500 range, depending on square footage, access conditions, and whether duct leakage testing is included. Same-day scheduling is usually available, and the written findings you receive at the end are what drive every remediation decision that follows.

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Home Energy Audit Cost Breakdown (2026)

A home energy audit in Seguin is not a single flat service – it’s a set of individual diagnostic tools, and the price reflects which ones get deployed in your home. Here’s how the numbers typically stack up in the Seguin market this year:

Audit Component	Typical Cost Range (Seguin, TX)	What It Tells You
Basic visual inspection only	$100 – $175	Insulation levels, visible gaps, HVAC placement – no pressurization data
Blower-door test (standalone)	$150 – $250	A pressurization reading that shows, in one number (CFM50), how much air your building envelope is losing
Thermal imaging / infrared scan	$100 – $200 add-on	Maps cold spots and heat intrusion in walls, ceilings, and floors that aren’t visible otherwise
Duct leakage test (Duct Blaster)	$100 – $175 add-on	Quantifies conditioned air lost inside wall cavities and unconditioned attic space before it reaches living areas
Full diagnostic audit (blower-door + thermal + written report)	$300 – $500	The standard package most Seguin homeowners need – covers the envelope, identifies priority fixes
Full audit + duct leakage + HVAC efficiency review	$450 – $650	Appropriate for homes over 2,500 sq ft, homes with two HVAC systems, or homes with persistent hot-room complaints

A few things push prices toward the top of those ranges in Seguin specifically. Homes built in the 1980s and 1990s in neighborhoods like Chaparral, River Chase, and along the older stretches of Highway 90 frequently have original fiberglass batts that have shifted or settled, original aluminum ductwork, and attic hatches with zero air sealing – all of which require more time to document properly. Older construction also tends to have more complex penetration points: can lights, pipe chases, and top-plate gaps that weren’t standard practice to seal when these homes went up. That complexity translates to more time in the attic and a more detailed written report, which costs more to produce accurately.

On the lower end, a newer build in a subdivision like Oak Creek Estates or along the growth corridor near FM 78 may sail through a blower-door test faster because the envelope is tighter by code – though Texas energy codes didn’t require meaningful air sealing until relatively recently, so “newer” doesn’t always mean “tight.” A 2010 build in Seguin can still read 5,000 CFM50 on the blower door, which is a significant amount of conditioned air loss for a 2,200 sq ft home.

What’s Included in a Written Report

At Envelope Insulation Co., every audit closes with a Documented Photo Record and a written set of findings – not a verbal summary at the door. The written report names the blower-door reading before any work is done, identifies the specific penetration points contributing to the number, and ranks recommended repairs by priority. That documentation is yours to keep, share with other contractors, or use as a baseline for a follow-up test after remediation. Under Haven Standard Clause 1, no work scope or written price is issued until the findings are in writing – you see the diagnosis before you decide anything.

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What Affects Home Energy Audit Pricing in Seguin

• Home size and story count: Square footage is the most direct cost driver. A 1,400 sq ft single-story ranch near downtown Seguin takes roughly half the diagnostic time of a 3,000 sq ft two-story home in Cordova Hills or the River Chase area. Two-story homes also require separate assessments of the floor-to-attic boundary versus the attic-to-exterior boundary, which adds time.
• Attic access and crawl space conditions: Seguin’s climate – hot, humid summers and periodic cold snaps that can dip into the low 20s in January – creates specific attic conditions. Many homes here have compressed or moisture-damaged insulation that makes attic navigation slower and messier. A tight, low-pitch attic in one of the older midtown homes can add 30-45 minutes to a full audit compared to a standard 10:12 pitch with good clearance.
• Number of HVAC systems: Homes with two air handlers – common in anything over 2,500 sq ft in Seguin’s newer subdivisions – require a duct leakage test on each system separately. That doubles the Duct Blaster setup time and adds to the final cost.
• Age of construction and building materials: Pre-1990 homes in Seguin’s historic core, particularly those built with masonry veneer or original brick siding, have different thermal mass characteristics and more complex air-sealing challenges than stick-frame homes built after 2000. Older homes almost always yield more findings, which means a more detailed report and longer time on site.
• Whether remediation is bundled: Some contractors in the area offer a discounted or free audit when you commit to insulation or air-sealing work up front. At Envelope Insulation Co., the audit findings drive the scope – we don’t pre-commit you to a remediation package before we know what we found. The written price for any follow-on work comes after the written audit report, not before. This matters because the audit findings determine the right scope; guessing at a scope before the audit is how unnecessary work gets sold.
• Guadalupe County permit requirements: Home energy audits themselves don’t require a permit in Seguin or Guadalupe County. However, if audit findings lead to spray foam application in conditioned attic spaces – an approach we use in some Seguin homes where the HVAC is located in the attic – Seguin’s residential building code does require a permit for that specific application. We handle that step in the written scope before any work begins, so there’s no surprise at the permit office.

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Why Seguin Homes Specifically Benefit From an Audit Before Insulation

This is where we need to say something direct: in Seguin, the sequence matters more than almost anywhere else in South-Central Texas. Here’s why.

The Seguin area sits in a mixed-humid climate zone (IECC Climate Zone 2A/3A boundary), which means your home fights two completely different problems depending on the season. In July and August, the attic is pulling outdoor air at 95-100°F into living spaces through every gap in the building envelope. In January and February, cold air is infiltrating from the floor perimeter and through can lights, and your heating system is working against a leaky envelope. An attic insulation job that skips the air-sealing step first is a partial fix in both seasons.

At Envelope Insulation Co., we’ve been operating under The Haven Standard since 2016, and the core position hasn’t changed: we seal before we insulate. Attic air sealing – closing top plates, can lights, pipe penetrations, and attic hatch perimeters – is completed before any insulation goes in, because blowing insulation over an unsealed floor just buries the problem. The blower-door number before and after shows you whether that sequence produced a result.

In practice, homes in Seguin’s older northeast neighborhoods regularly come in at 6,000 to 8,000 CFM50 on the initial blower-door test – meaning the house is exchanging its conditioned air volume with outdoors roughly twice per hour. After proper air sealing, that number commonly drops to 3,000-4,000 CFM50. That’s the kind of change that shows up on a utility bill, not just on a gauge. We publish those before-and-after numbers on applicable jobs because that’s what documentation looks like in practice – not a feeling, not an estimate, a number.

If you’re considering Home Energy Audit in Seguin as a starting point before committing to insulation work, that’s the right sequence. The audit tells you where the problems are ranked by severity, and the written report gives you something to shop with if you want a second opinion on the remediation scope.

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How to Save on a Home Energy Audit in Seguin

1. Use the Audit to Prioritize, Not to Confirm

The most common money-saving move is using the audit findings to do remediation in phases. If the blower-door test reads 7,200 CFM50 and the thermal scan shows most of the infiltration is at the attic floor, you address that first. You don’t need to replace windows, add wall insulation, and re-duct the house in year one. The written report ranks findings – use that ranking.

2. Ask About CPS Energy or AEP Texas Rebates

If your Seguin home is served by AEP Texas (which covers most of Guadalupe County), check the current rebate schedule before you book an audit. AEP Texas has historically offered rebates on qualifying energy efficiency upgrades including insulation improvements, and some rebate programs require a pre-inspection audit from a qualified auditor. The rebate structure changes year to year, so confirm the current program directly with AEP before assuming the 2025 numbers still apply in 2026. We can document the before-and-after measurements that rebate applications typically require.

3. Don’t Bundle the Audit Into a Remediation Package You Haven’t Reviewed Yet

Several contractors in the Seguin and New Braunfels markets offer a “free audit” as part of a remediation package priced before the audit has been completed. That’s not a free audit – that’s a pre-sold scope with a marketing name attached to the inspection step. The audit findings should determine the scope, not the other way around. Under Haven Standard Clause 1, we issue a written price for any remediation work after the audit findings are documented, not before.

4. Get a Second Opinion on Any Written Estimate

If you’ve already received a written estimate from another contractor and something in it doesn’t read clearly – a vague line item, a scope that doesn’t match what you saw in the attic, a blower-door number that wasn’t provided – bring it to us. We offer a free second opinion on any written estimate. That means reading the scope with you, explaining what the numbers mean, and telling you whether the recommended work matches the documented findings. Call (830) 549-6646 to set that up.

5. Schedule During Off-Peak Months

Demand for energy audits in Seguin peaks in April-May (before cooling season) and October (before heating season). Scheduling in January, February, or August can sometimes free up faster appointment windows and, for some contractors, more flexible pricing. It also puts you ahead of the contractor rush that follows the first 100-degree week of summer, when every insulation company’s schedule compresses fast.

6. Start With the Free Estimate

Before booking a full diagnostic audit, call (830) 549-6646. We can do a preliminary assessment and give you a written price for the full audit before you commit. That’s not a bait-and-switch to a bigger scope – it’s literally the price, in writing, before anyone comes out. If the price doesn’t work for you, you’re not obligated to anything.

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FAQs – Home Energy Audit Cost in Seguin

How much does a home energy audit cost in Seguin, TX?

A full home energy audit in Seguin typically costs between $300 and $500 for a standard single-family home, covering the blower-door test, thermal imaging, and a written report. Smaller homes under 1,500 sq ft may come in closer to $250, while larger homes over 2,500 sq ft or homes requiring duct leakage testing can reach $600-$650. Call (830) 549-6646 for a written price specific to your home’s size and age before booking.

Is a home energy audit worth the cost in Seguin?

For most Seguin homes, yes – particularly homes built before 2005. The audit identifies the specific air leaks and insulation deficiencies that are costing you money each month, and ranks them so you know where to spend remediation dollars first. A home reading 7,000 CFM50 on a blower-door test that gets sealed down to 3,500 CFM50 after targeted attic air sealing typically sees measurable reductions in cooling load during Seguin’s five-month peak cooling season. The audit cost is usually recovered within the first cooling season after the fixes it recommended are completed.

What does a home energy audit include?

A standard home energy audit in Seguin includes: a blower-door test that quantifies building envelope air leakage in CFM50 (cubic feet per minute at 50 pascals of pressure), a thermal imaging scan to map where infiltration is entering the living space, a visual inspection of insulation levels and condition in the attic and accessible crawl spaces, and a written report with findings ranked by priority. At Envelope Insulation Co., the audit also closes with a Documented Photo Record of conditions found on site. If duct leakage testing is included, a Duct Blaster – a pressurization tool specific to the duct system – is also deployed.

Can I get a free home energy audit in Seguin?

A genuinely free diagnostic audit – one that produces a blower-door reading, thermal scan, and written report with no strings attached – is uncommon in the Seguin market. What’s frequently marketed as a “free audit” is usually a visual inspection paired with a pre-written remediation estimate. That’s not the same thing. AEP Texas has historically offered rebate programs that subsidize qualified audits, which can reduce your out-of-pocket cost significantly. Check AEP’s current 2026 program before assuming eligibility. What we do offer at no charge is a free written estimate and a free second opinion on any written estimate you’ve already received – call (830) 549-6646 to use either one.

How long does a home energy audit take in Seguin?

Most full home energy audits in Seguin take 2 to 4 hours on site. A 1,600 sq ft single-story home with good attic access runs about 2 hours. A 2,800 sq ft two-story home with a complex attic floor and two HVAC systems can take closer to 4 hours. The written report is typically delivered the same day or within 24 hours of the site visit. We give you a named technician and a text when they’re on the way – no arrival windows measured in half-day blocks.

Is it cheaper to repair or replace insulation in Seguin after an audit?

It depends entirely on what the audit finds – which is exactly why the audit comes first. In Seguin homes built before 1995, original fiberglass batts that have settled, been compressed by foot traffic, or absorbed moisture from roof leaks are often better removed and replaced than topped with additional blown-in material. Blowing new insulation over damaged or contaminated existing material doesn’t restore R-value effectively. However, in homes where the existing insulation is intact but simply under-depth, adding blown-in insulation over what’s there is usually the more cost-effective path. The written audit report gives you that answer for your specific home. On home insulation jobs where we recommend removal before replacement, that recommendation is in writing, with the reasoning, before you decide.

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Seguin-Specific Conditions That Change What Auditors Find

Auditors who work exclusively in Austin or San Antonio occasionally underestimate what Seguin’s specific conditions produce inside building envelopes. A few patterns we see regularly here:

• Moisture accumulation near the Guadalupe River corridor: Homes in the River Chase and River Road areas often show higher relative humidity in the crawl space and lower attic levels than comparable homes further from the river. That moisture affects insulation performance and shows up clearly in thermal imaging – wet fiberglass has almost no effective R-value.
• Wind-wash at the eaves: Seguin’s position in South-Central Texas means consistent south-southeast winds during most of the year. In homes where the attic insulation runs close to the eaves without baffles or blocking, wind-washing – the displacement of loose-fill insulation by air movement entering at the soffit – is a common audit finding. The blower-door test picks up the leakage, and the thermal scan shows the displaced zones.
• Can lights in older homes: Seguin homes built in the late 1980s and early 1990s, particularly in the Chaparral and Country Club Estates neighborhoods, frequently have recessed can lights in the ceiling that were never air-sealed. Each unsealed can light is a direct pathway between the conditioned living space and the hot attic. On a 1,900 sq ft home with 18 unsealed can lights, that’s a meaningful fraction of total infiltration – something a visual inspection alone won’t quantify, but a blower-door test will.
• Pier-and-beam homes near downtown: Several blocks of downtown Seguin and the adjacent historic residential streets have pier-and-beam construction, which means the floor system is part of the building envelope. Auditors working these homes need to access the crawl space to assess floor insulation, vapor barriers, and ground moisture conditions – a step sometimes skipped by auditors who default to attic-focused protocols.

Wes Okafor leads the team at Envelope Insulation Co., and these are the conditions Wes has built the audit protocol around since 2016. Nine thousand-plus homes sealed and insulated across Central Texas have produced a clear picture of what Seguin’s building stock actually looks like inside – not what the permit records suggest.

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What Happens After the Audit

The audit report is a starting point, not a sales document. After you receive the written findings, here’s what the typical next step looks like at Envelope Insulation Co.:

1. Review the written findings – the blower-door number, thermal imaging results, and ranked priority list. Ask questions. You should understand why each finding is ranked where it is.
2. Receive a written price for recommended remediation – under Haven Standard Clause 1, that price is flat, the scope is written, and the warranty is written before any work begins. No verbal estimates, no “we’ll figure it out as we go.”
3. Get a second opinion if you want one – we offer a free second opinion on any written estimate, including our own if you want to benchmark it against a competing quote.
4. Work is completed with a Documented Photo Record – every attic air-sealing and insulation job closes with photos of conditions before and after, plus before-and-after blower-door readings on applicable jobs so you can see the performance change in one number.
5. 365-Day Done Right Promise – if anything isn’t right, we make it right. That’s a written warranty, not a verbal assurance.

The point of documenting everything – the audit findings, the written scope, the before-and-after readings – is that you have a record of what was found, what was done, and what changed. That’s what Wes Okafor built Envelope Insulation Co. around in 2016, and it hasn’t changed.

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Key Takeaways

• Home energy audit cost in Seguin, TX runs $250-$650 for most residential homes, with the $300-$500 range covering the majority of single-family properties.
• The blower-door test is the core diagnostic tool – it gives you one number (CFM50) that shows exactly how leaky the building envelope is before and after any work.
• Seguin-specific factors – Guadalupe River humidity, wind-wash at the eaves, unsealed can lights in 1980s-90s builds, and pier-and-beam homes near downtown – make a thorough audit more valuable here than a visual inspection alone.
• Air sealing should happen before insulation is added – blowing insulation over an unsealed attic floor buries the problem rather than fixing it.
• Under Haven Standard Clause 1, you receive a written price before any work starts – no work begins without it.
• A free second opinion on any written estimate is available at no charge – call (830) 549-6646.

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Ready to Get a Written Price for Your Seguin Energy Audit?

If your Seguin home is running higher utility bills than it should, or if you’ve had insulation work recommended without a blower-door reading to back it up, a Home Energy Audit is the right first step. Envelope Insulation Co. has been providing written-price audits and documented before-and-after results in Seguin and across Guadalupe County since 2016. Wes Okafor and the team answer calls live, 24/7 – no voicemail loops, no callback windows measured in business days.

Call (830) 549-6646 to get a written price for your audit before anyone comes out. If you’ve already received a written estimate from another contractor and want a second set of eyes on it, that’s free – bring it to us and we’ll read it with you.

Written by Wes Okafor, Owner at Envelope Insulation Co. (operating as Topside Attic Insulation Seguin), independently owned and operated under The Haven Standard since 2016, serving Seguin, TX and Guadalupe County.

Pricing reflects the Seguin market as of 2026. Topside Attic Insulation Seguin offers free estimates – call (830) 549-6646.