Blown-In Insulation Cost - Same-Day Service, Done Right the First Time

How Much Does Blown-In Insulation Cost in San Antonio?

Blown-in insulation in San Antonio typically costs $1.50 to $3.50 per square foot installed, which means a standard 1,500-square-foot attic runs between $2,250 and $5,250 total. Most homeowners in the San Antonio area pay around $3,000 for a complete attic job using fiberglass or cellulose, including labor and materials. The final number depends on your existing insulation depth, the material you choose, and whether air sealing is part of the job.

At Aspen Attic Insulation San Antonio, we put the price in writing before any work starts. You’ll know the number before you ever open the door to a technician. If you want an exact quote for your attic, call (361) 213-9499 for a free estimate.

Blown-In Insulation Cost Breakdown (2026)

Here’s what Blown In Insulation services cost in the San Antonio market in 2026, broken down by line item. These are real numbers from jobs we perform across the city, from Alamo Heights to Stone Oak to Helotes.

What drives cost up or down? Depth is the biggest lever. San Antonio sits in climate zone 2, where the Department of Energy recommends R-30 to R-60 in attics. If your house currently has R-19 (about 6 inches of old fiberglass), bringing it to R-38 or R-49 requires less material than a bare attic needing R-30 from scratch. Accessibility matters too. Older homes in neighborhoods like Monte Vista and Alta Vista often have low-slope roofs with tight attics, which slows the crew down and adds labor hours. Homes in newer developments like Alamo Ranch or Cibolo Canyons usually have open, walkable attics that go faster.

For more detail on how our crew handles a full install from prep to cleanup, see our Blown-In Insulation in San Antonio service page.

What Affects Blown-In Insulation Pricing in San Antonio

• Attic size and shape. A 1,000-square-foot attic costs less than a 2,500-square-foot one, obviously. But shape matters too. Steep pitches and tight corners in older San Antonio homes (think King William or Jefferson bungalows) mean the hose and the technician work slower, which adds labor time.
• Existing insulation depth. If you already have some insulation, you pay less because we’re topping up rather than starting from zero. We measure what’s there during the estimate and do the math in front of you.
• Material type. Fiberglass is the budget-friendly standard. Cellulose runs about 15 to 20 percent more but performs better at blocking San Antonio’s summer heat transfer. Rockwool is the premium option. We stock Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber, so the right product goes in, not just the one sitting on the truck.
• Air sealing scope. Blowing insulation over a leaky attic floor is like putting a coat on over a wet shirt. In San Antonio’s summer, every unsealed penetration (recessed lights, attic hatches, wire chases) lets hot air pour in. Air sealing adds $400 to $900 but improves the insulation’s effective performance dramatically. We price it separately so you see exactly what it costs.
• Access and clearance. Some San Antonio attics have scuttle holes in closets. Others have pull-down stairs in the hallway. A few have neither and need an access point cut. Each scenario changes labor. We’ll tell you on the estimate which one yours is.
• Rodent or insect remediation. If rats, squirrels, or roaches have been living in your old insulation, it needs to come out before new material goes in. Removal runs $1 to $2 per square foot. In areas like Leon Valley and Converse, we see this more often in older homes with mature trees close to the roofline.

How to Save on Blown-In Insulation

Saving money on insulation doesn’t mean cutting corners. It means timing, utilities, and honesty about what you actually need.

• Do air sealing at the same time. Combining air sealing with blow-in work saves you a second crew visit. It’s the best dollars-per-degree improvement you can make in a San Antonio attic.
• Check CPS Energy rebates. CPS Energy periodically offers rebates for insulation upgrades through their energy efficiency program. The amounts change year to year. We’ll mention what’s current when you call, but you should also check directly with CPS Energy before scheduling.
• Top up instead of full replacement. If your existing insulation is dry, clean, and pest-free, adding blown-in on top is significantly cheaper than removing and starting over. Most San Antonio homes need a top-up rather than a full removal.
• Schedule in the shoulder season. Spring and fall are less busy for insulation contractors in San Antonio. You won’t get a lower price by waiting, but you’ll get faster scheduling and more flexibility. In the dead of July, every contractor in Bexar County is running full schedules.
• Get a written, itemized estimate. At Aspen Attic Insulation San Antonio, the estimate you get is the price you pay. No post-job surprises. Call (361) 213-9499 for a free, written estimate, and you’ll know the number before we ever step foot in your attic.

One more thing. The fastest way to overspend on blown-in insulation is to install the wrong product for your attic’s specific conditions. A humid San Antonio attic with poor ventilation shouldn’t get the same material as a dry, well-vented one. We match the material to the need, using the eight brands we stock rather than pushing a single product at every job.

Blown-In vs. Spray Foam: What’s the Cost Difference in San Antonio?

Homeowners considering attic work often ask about the difference. Blown-in insulation runs $1.50 to $3.50 per square foot installed. Spray foam insulation runs $3.50 to $7.00 per square foot installed, roughly double to triple the cost of blown-in. The performance difference matters in specific situations. Open-cell spray foam air-seals and insulates in one step, which makes it worthwhile in tough attic configurations with lots of odd angles. Closed-cell spray foam adds structural strength and moisture resistance, which serves homes in flood-prone or high-humidity areas. For most San Antonio homes with standard vented attics, blown-in insulation provides strong performance at a much lower installed cost.

We install both. If spray foam makes sense for your attic, we’ll tell you with numbers. If blown-in is the better value, we’ll say that too. The analysis is part of the free estimate.

Does Blown-In Insulation Pay for Itself in San Antonio?

Yes, and here’s the local math. San Antonio sees 100+ degree days every summer, and attic temperatures regularly hit 140 to 160 degrees Fahrenheit in July and August. That heat radiates down into the living space, forcing your AC to work harder. In a 2,000-square-foot home with R-19 attic insulation, upgrading to R-49 typically cuts cooling costs 15 to 25 percent. On a $250 summer electric bill, that’s $38 to $63 per month saved during the hottest months. Over a full year, most homeowners see $300 to $500 in total energy savings.

At a $3,000 installed cost, payback lands between 6 and 10 years. But that’s before you factor in the comfort difference. Homes with proper attic insulation hold their temperature better. The AC doesn’t run constantly. Upstairs rooms stop feeling like a sauna by 3 p.m. That’s the benefit our customers in neighborhoods like Hollywood Park and Timberwood Park talk about most, especially in August.

How Long Does Blown-In Insulation Last in San Antonio’s Climate?

Blown-in fiberglass and cellulose both last 30 to 50 years when properly installed and kept dry. In San Antonio’s climate, the main threat is moisture. Our summers are hot and humid, and without proper attic ventilation, condensation can collect on the underside of the roof deck and drip onto the insulation. Wet insulation loses R-value and becomes a breeding ground for mold. That’s why every Aspen Attic Insulation San Antonio estimate includes a check of your attic ventilation. If your soffit and ridge vents aren’t pulling air properly, fixing that matters as much as the insulation itself.

Cellulose has a slight edge in long-term performance in our climate. The borate treatment it comes with resists both mold and pests, which is a real benefit in a humid region where roaches and rodents look for warm attic nesting sites.

Can You Install Blown-In Insulation Yourself?

You can rent a blower from a home improvement store and do the work yourself. Material cost drops to around $0.80 to $1.20 per square foot. But here’s what you’re taking on. Blowing insulation requires two people: one feeding the hopper and one working the hose in the attic. In a 140-degree San Antonio attic in June, that’s not a casual weekend project. You also need to work around wiring, recessed lights, and framing without compressing the material (compressed insulation loses up to half its R-value). And if you miss air sealing, you’ll install insulation over leaks and get a fraction of the performance you paid for.

We’ve fixed plenty of DIY jobs. A common issue is uneven depth. The homeowner runs out of material in one corner and leaves another corner overstuffed. The result is inconsistent comfort throughout the house. If you want it done once and right, with a written guarantee, call (361) 213-9499. Estimates are free.

Who Should You Hire for Blown-In Insulation in San Antonio?

Here’s the honest answer. You should hire someone who gives you a written price before work starts, sends you the technician’s name and photo before the visit, and backs the job with a written guarantee. That’s not marketing fluff. It’s the minimum you should accept when letting someone into your attic and your home.

Aspen Attic Insulation San Antonio follows what we call the Threshold Standard, part of the Threshold Group family founded in 2002. Every technician is background-checked, identity-verified, and arrives in a clean marked uniform with a photo ID badge at the door. Before the visit, you’ll get the tech’s name and photo. If anyone else shows up, the visit is free and we make it right. Every job gets a written price before work begins, and every repair is covered by our 365-Day Done Right Promise. If it’s not done right, we make it right. That promise covers labor and materials for a full year, with a free second visit if a repair fails.

Garrett Sloane leads our San Antonio operation. He built the process around two fears homeowners have: the unknown stranger at the door and the surprise bill after the job. Both get eliminated before work starts. The name, the face, and the price are all in writing before you ever open the door.

FAQs – Blown-In Insulation Cost

How much does blown-in insulation cost for a 1,500 sq ft attic in San Antonio?

Blown-in insulation for a 1,500-square-foot attic in San Antonio costs $2,250 to $5,250 installed, with most jobs landing around $3,000. The range depends on material (fiberglass is cheapest at $1.50 to $2.25 per square foot), existing insulation depth, and whether air sealing is included. Call (361) 213-9499 for a free written estimate specific to your attic.

Is it cheaper to remove old insulation or blow over it?

Blowing over existing insulation is almost always cheaper. Overblowing new material on top runs $1.50 to $2.75 per square foot, while removal plus new installation runs $2.50 to $5.50 per square foot total. You only need removal if the existing insulation is wet, moldy, or pest-infested. During a free estimate, we’ll inspect what’s in your attic and tell you honestly which route is necessary.

How much does blown-in insulation cost per square foot installed?

Blown-in insulation costs $1.50 to $3.50 per square foot installed in San Antonio, including labor and materials. At the low end, fiberglass comes in at $1.50 to $2.25 per square foot. Cellulose runs $1.75 to $2.75, and Rockwool runs $2.50 to $3.50. Get an exact number for your attic by calling (361) 213-9499.

Can blown-in insulation be installed in one day?

Yes. A standard San Antonio attic between 1,000 and 2,000 square feet takes our two-person crew about 4 to 6 hours, including prep, blowing, and cleanup. Larger attics or jobs requiring air sealing or old insulation removal may take a full day to a day and a half. We’ll give you a time commitment as part of the written estimate.

Does blown-in insulation qualify for a rebate or tax credit in San Antonio?

In 2026, blown-in insulation that meets minimum R-value requirements may qualify for a federal energy efficiency tax credit, and CPS Energy periodically offers local rebate programs for attic insulation upgrades. The qualifying amounts change, so we recommend checking with CPS Energy directly. Our estimates include the R-value target we’d achieve, which you’ll need for any rebate paperwork.

What R-value do I need for blown-in insulation in San Antonio?

San Antonio is in climate zone 2, where the Department of Energy recommends attic insulation between R-30 and R-60. Most existing San Antonio homes sit at R-19 or lower. We typically recommend bringing attics to R-38 or R-49, which balances cost against performance in our summer-dominant climate. Our free attic inspection includes a measurement of your current R-value so you know where you stand.

For more detail on how the entire process works, from the initial attic inspection to final cleanup, visit our home page or the main Blown-In Insulation in San Antonio service page.

Get a Free Blown-In Insulation Estimate in San Antonio

You don’t have to guess what blown-in insulation will cost. You can get a written price before any work starts. Aspen Attic Insulation San Antonio sends a background-checked, photo-badged technician to inspect your attic, measure your existing insulation, and give you a line-item estimate on paper. The number we quote is the number you’ll pay. And the job is covered by our 365-Day Done Right Promise, with a free second visit if any repair fails in that year.

Call (361) 213-9499 to schedule your free estimate. A live person answers the phone 24/7. You’ll know the cost before you open the door.

Pricing reflects the San Antonio market as of 2026. Aspen Attic Insulation San Antonio offers free estimates – call (361) 213-9499.

Written by Garrett Sloane, Owner at Aspen Attic Insulation San Antonio, serving San Antonio since 2002.