Trusted Insulation for San Antonio Homeowners
Insulation in San Antonio has to fight a climate that punishes weak spots. Our summers push attic temperatures past 140 degrees, and homes with thin or settled insulation bleed cooled air straight through the ceiling while electric bills climb into the hundreds. Garrison Partners connects San Antonio homeowners with an insulation specialist that works to The Garrison Standard: the price goes in writing before any work starts, the crew arrives in the window we gave you, and the finished job carries a 365-Day Done Right Promise in writing. Preston Harley leads this brand with the same discipline he brought from his service background. When you call (409) 215-3468, a live person answers and schedules your free estimate.
Key Takeaways
- Most San Antonio homes are under-insulated by current DOE standards, especially homes built before 2005.
- Blown-in and batt insulation are the two most common retrofit options for attics, walls, and crawl spaces in south Texas.
- Pricing is always in writing before work begins and the finished job is backed for a full year under the 365-Day Done Right Promise.
- Free estimates are available by calling (409) 215-3468, with a live person answering day or night.
What Our Insulation Service Includes
Every insulation job in San Antonio starts with a full assessment of what’s already in your attic, walls, and floors. We don’t quote over the phone. We measure, inspect, and give you a written price based on what we actually find. Below are the specific services we handle under the insulation umbrella.
Attic Insulation
Attic insulation is the single highest-impact upgrade for San Antonio homes. Heat pours through the roof deck all afternoon, and without enough barrier between the attic and your living space, that heat transfers down into the rooms below. We install blown-in fiberglass and cellulose, both of which settle into existing spaces and fill gaps that rolled batts miss. We check your attic’s current R-value, identify gaps around recessed lights and plumbing chases, and build the layer up to what south Texas actually requires.
Wall Insulation
Wall insulation matters more than most San Antonio homeowners realize, especially in older frame homes in neighborhoods like Alamo Heights and Jefferson. Homes built before the 1980s often have zero or nearly zero insulation in exterior walls, which means your air conditioner is fighting heat gain from all four sides, not just the roof. We drill and fill retrofit wall cavities with blown-in material, working from the exterior or interior depending on construction. The difference is measurable on the first hot afternoon after the job is done.
Crawl Space Insulation
Crawl space insulation addresses the damp, warm air that rises from the ground beneath pier-and-beam homes, which you’ll find throughout older San Antonio neighborhoods like Monte Vista and Mahncke Park. Without a proper vapor barrier and insulation beneath the floor, humidity and heat both seep into the house, making your AC work harder and creating musty smells. We inspect the crawl space, address the vapor barrier, and install fiberglass batt or closed-cell spray foam against the subfloor where it will hold up to Texas humidity.
Spray Foam Insulation
Spray foam insulation is the premium option for San Antonio homeowners who want maximum air sealing along with thermal resistance. Open-cell foam works well in attics where you want the roof deck to breathe, while closed-cell foam adds structural strength and an air barrier in walls and crawl spaces. We explain the difference honestly and recommend spray foam only where the cost makes sense for your home’s specific layout and age. The written estimate includes exactly what the foam will cover, the depth we’ll apply, and what the finished R-value will be.
Radiant Barrier Installation
A radiant barrier is a reflective material installed along the underside of the roof deck that bounces radiant heat back out before it can heat up your attic air. In San Antonio’s sun, this can lower attic temperatures by 20 to 30 degrees on a July afternoon, which takes real load off your AC system. We install radiant barriers in new construction and retrofits, and we’ll tell you honestly whether your home’s roofline and attic configuration make it worth the investment. Some homes benefit enormously, and some don’t, and you’ll get the truth either way.
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.
Brands We Service for Insulation
We work with insulation products from leading manufacturers including Owens Corning, Johns Manville, CertainTeed, and Knauf, and we select material based on what your San Antonio home actually needs rather than what’s easiest for us to stock. Every job uses material rated for the Texas climate zone, with R-values specified in the written estimate before any work begins.
Our crews install both fiberglass and cellulose products from these manufacturers, and we stay current on their installation specifications so the material performs the way it’s rated. Whether your home calls for blown-in fiberglass, blown-in cellulose, roll-out batts, or spray foam, we’ll recommend the right product for the space and give you the price in writing before we open a single bag.
Signs You Need Insulation Right Now
- Your upstairs rooms are 8 to 10 degrees warmer than downstairs. This is the most common complaint we hear in San Antonio during summer, and it almost always points to insufficient or settled attic insulation above those rooms. Heat gain through the attic is the dominant summer load for most two-story homes in this market.
- Your electric bill stays over $250 in summer months. San Antonio homes with properly insulated attics simply don’t strain their AC the way under-insulated homes do. If your bill stays elevated even after you’ve serviced your HVAC system and sealed your windows, the insulation is the missing variable.
- You can see the tops of your ceiling joists in the attic. If your attic insulation sits flush with or below the joists, you’re likely carrying half the R-value you need for this climate. Proper attic insulation in San Antonio should be deep and evenly distributed, not shallow and patchy.
- Your home was built before 2005 and has never had insulation added. Building codes and insulation standards have changed substantially in the last two decades. Most pre-2005 San Antonio homes were insulated to older standards that fall far short of what today’s DOE guidelines recommend for the south Texas climate zone.
- You feel drafts near baseboards and exterior walls in winter. San Antonio’s winter cold snaps don’t last long, but they reveal where walls are missing insulation. If certain rooms feel cold within minutes of the heat cycling off on a 30-degree night, your wall cavities are likely the problem.
Our Insulation Process – Step by Step
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The assessment. We start with a full walkthrough of your attic, walls, and crawl space if you have one. We measure existing insulation depth, check for air leaks around penetrations, and look for moisture problems that need handling before new insulation goes in. This step determines everything that follows, and it’s why we never quote over the phone.
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The written estimate. You get a line-item price in writing before you commit to anything. The estimate covers the material, the labor, the cleanup, and the disposal of any old insulation we’re removing. There’s no number that moves at the door.
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Prep and protection. We lay down floor protection, mask off the work area, and set up dust control so the rest of your home stays clean. Our techs are background-checked, uniformed, and identified before they walk in, so you always know who’s in your home.
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Installation. We install the insulation to the R-value specified in your estimate, working through the attic, walls, or crawl space as agreed. We check for even coverage, seal penetrations around can lights and ceiling boxes where appropriate, and document the finished work with photos you can see.
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Final walkthrough and the 365-Day Done Right Promise. We walk the space with you, show you what was installed, and confirm the depth and coverage match the written estimate. Then we leave the site clean, and your work is guaranteed in writing for a full year. If anything fails in that window, we come back and make it right at no charge.
How Much Does Insulation Cost in San Antonio?
Insulation pricing in San Antonio depends on the space you’re insulating, the material you choose, and the square footage involved. A typical attic insulation job in a 1,600-square-foot home runs $1,200 to $2,800 to bring the attic up to current R-value standards. Blow-in wall retrofits generally run $2,000 to $5,000 depending on how many exterior walls need filling and how accessible they are. Crawl space insulation typically runs $1,500 to $3,500 when you include the vapor barrier work that should accompany it. Spray foam runs higher per square foot than blown-in products, but it delivers air sealing that batts and loose-fill can’t match.
Three factors drive most of the price: access, existing conditions, and material choice. A wide-open attic with easy access costs less than a low-slope roof with tight clearance. An attic with old, rodent-damaged insulation that needs removal before new work goes in costs more than a clean slate. And spray foam costs more than blown-in fiberglass, though it’s sometimes the right answer for specific spaces. Every estimate includes a line-item breakdown so you can see exactly where the money goes, and the price is quoted and agreed in writing before any work starts.
Insulation Near San Antonio – Our Service Area
Our insulation team serves San Antonio and the surrounding area, including neighborhoods like Stone Oak, Alamo Ranch, Helotes, Leon Valley, Converse, Schertz, and Cibolo. Most assessments can be scheduled within a few days, and the written estimate appointment typically takes about an hour. For a full picture of how home services fit together under one standard, take a look at everything the family of brands covers.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions – Insulation in San Antonio
Insulation is material installed in your attic, walls, and floors that slows the transfer of heat between your home’s interior and the outside air. In San Antonio’s climate, the primary job is keeping heat out of your living space during the long summer while also holding in warmth during the brief winter cold snaps. The right insulation, properly installed, reduces the load on your HVAC system and lowers your monthly energy cost for the life of the house.
Most attic insulation jobs in San Antonio are completed in one day. Wall retrofits and crawl space jobs typically run one to two days depending on square footage and access. You’ll get a specific timeframe in your written estimate before any work begins.
A typical attic insulation job in San Antonio runs $1,200 to $2,800 for a home around 1,600 square feet, bring the attic up to current R-value standards. Wall and crawl space work runs higher depending on scope. Call (409) 215-3468 for a free in-home estimate and a written price before any work begins.
Yes, most of the insulation work we do in San Antonio is retrofit work, which means adding to or replacing what’s already there. We assess the condition of your existing insulation, tell you honestly what’s worth keeping and what needs removal, and build the final estimate around that. You’ll see the line items clearly, including any removal and disposal charges if they apply.
Insulation itself rarely presents a true emergency, but situations like storm damage, animal intrusion in the attic, or a roof leak that soaked your insulation do need prompt attention. We can usually assess damaged insulation within a few days and get the problem areas corrected quickly. For anything urgent, call (409) 215-3468 and a live person will help you schedule the right visit.
Yes. Every insulation job we complete in San Antonio is backed by the 365-Day Done Right Promise in writing. If the work fails in that window, we come back and make it right at no charge. The same standard applies across every service in the Garrison Partners family.
Clear a path to your attic access point and move anything stored directly under the access hatch. If you have a crawl space, make sure the access door is reachable. During the assessment, we’ll handle everything else, including measuring, inspection, and the written estimate. You don’t need to move furniture or vacate the home.
Schedule Your Insulation Service in San Antonio Today
You deserve an insulation contractor in San Antonio who shows up on time, quotes the price in writing, and stands behind the work for a full year. That’s the standard, and it applies to every job. Call (409) 215-3468 now for your free in-home estimate and get the Insulation in San Antonio service your home has been missing.
Written by Preston Harley, Owner at Garrison Partners, serving San Antonio since 2010.