Blown-In Attic Insulation in San Antonio, TX

Blown-In Attic Insulation in San Antonio, TX

Blown-in attic insulation costs between $1.50 and $3.50 per square foot installed in San Antonio, with most homes falling in the $1,800 to $4,200 range depending on attic size and current insulation depth. The work typically takes one day, and homeowners usually see the difference on their next CPS Energy bill. At Aspen Attic Insulation San Antonio, you’ll get a written price before we start, a technician whose name and photo you receive before the visit, and a 365-day guarantee on every job. Call (361) 213-9499 for a free estimate.

Blown-in insulation, which is loose fiber material blown into the attic cavity to fill every gap and void, remains the most common retrofit choice for San Antonio homes built before 2010. Those houses were typically insulated to R-19 or R-22 when R-38 to R-49 is what our climate actually calls for. If your home falls into that category, you’re losing cooled air through the attic every day from May through October, and you’re paying for it. Our Attic Insulation in San Antonio team handles both new installs and top-ups over existing material, and we’ll tell you honestly which one your attic needs.

Blown-in work also sits alongside our broader home insulation services, so if you call us about one issue and we find another, we’ll tell you what we saw and quote it separately. No surprises, no upsell pressure. That’s how Garrett Sloane has run this location, and it’s how every tech who shows up at your door operates.

Key Takeaways

• Blown-in attic insulation in San Antonio runs from $1.50 to $3.50 per square foot installed, with most homes falling between $1,800 and $4,200.
• The work takes one day, and you’ll generally notice the difference on your first full monthly CPS Energy bill.
• San Antonio attics built before 2010 usually sit at R-19 to R-22; our climate wants R-38 to R-49 minimum.
• You’ll receive your technician’s name and photo before the appointment. That person arrives in a marked uniform with a photo ID badge.
• Every job carries a written price up front and the 365-Day Done Right Promise in writing, covering labor and materials.

When You Need Blown-In Attic Insulation

Most San Antonio homeowners don’t think about our Attic Insulation services until a problem forces them to. Here are the situations that typically bring people to us:

• Upstairs rooms that never cool down. In Alamo Heights and Terrell Heights, we see older pier-and-beam and frame homes where the upstairs runs eight to ten degrees warmer than the downstairs all summer. That’s almost always an attic insulation problem, not an AC problem.
• Summer electric bills over $250 a month for a 1,500-square-foot home. The attic is the single largest source of heat gain in a Texas house. If your insulation is thin or settled, your AC is fighting a battle it can’t win.
• Your home was built before 2010. Building codes then allowed much less attic insulation than is standard today. Many of those homes in the Medical Center and Castle Hills areas have never been topped up since construction.
• You can see the tops of your ceiling joists in the attic. If the joists are exposed, you’re looking at roughly three to five inches of insulation. In San Antonio, you’ll want ten to fourteen inches of blown-in fiberglass or cellulose to hit R-38 or higher.
• Rooms feel drafty in winter, not just hot in summer. Heat rises. A poorly insulated attic lets warm air escape all winter long, which is why your heater runs constantly in January even though our winters are short.
• You’ve had rodent or pest activity in the attic. Rats and squirrels compress insulation, contaminate it, and leave voids. After pest remediation, new blown-in material is usually the practical fix.

If any of those sounds familiar, blown-in insulation is likely part of the answer. And if you call (361) 213-9499, a live person answers. Always. We’ll talk through what you’re seeing and set up a time for a proper attic inspection.

What Blown-In Attic Insulation Actually Is

The trade term is loose-fill insulation. It’s exactly what it sounds like: small particles of fiberglass or cellulose blown through a hose into the attic cavity using a machine that sits in the driveway or garage. The material settles into corners, around ductwork, and between joists in a way batts and rolls can’t match. That’s why we recommend it for retrofit work in existing attics rather than pulling up decking to lay Attic Batt Insulation.

In San Antonio, we specify blown-in insulation to R-38 minimum, which is the Department of Energy’s recommendation for Climate Zone 2. That generally means ten to fourteen inches of material depending on the product. For newer, larger homes or if you have a vaulted ceiling or converted attic space, R-49 can make sense.

We install both fiberglass and cellulose. Fiberglass from Owens Corning or CertainTeed is light, won’t settle as much over time, and holds its R-value well. Cellulose, often from GreenFiber, is denser, does a better job blocking airflow, and is made from recycled paper treated with a fire retardant. Both have their place. We’ll tell you which one fits your attic and your budget, and the written quote will name the product before any work starts.

Our Blown-In Attic Insulation Process

Every job follows the same sequence. Here’s what happens when you hire us:

1. You call and talk to a live person. No phone tree, no call-back window. We take your information, ask a few questions about your home, and schedule a time for an attic inspection. You’ll receive your technician’s name and photo before the visit.
2. The technician arrives and verifies identity. Your tech shows up in a clean, marked uniform and presents a photo ID badge at the door. If anyone other than the named technician arrives, the visit is free and we’ll make it right. That’s the Threshold Standard, and it’s non-negotiable.
3. We inspect the attic properly. We check current insulation depth, look for air leaks around penetrations, note any wiring or venting issues, and measure the attic square footage. We’ll also check for moisture problems, because blowing insulation over a roof leak makes things worse, not better.
4. You get a written price. Before any material is ordered or any work begins, you’ll have a line-item quote in writing. It names the product, the R-value target, the square footage, and the total price. No verbal estimates, no “we’ll see how it goes.”
5. We do the work in one day. The crew sets up the blowing machine, protects the access area, and installs the insulation to the specified depth. We use depth markers so you can see for yourself that the finished product matches the spec you were quoted.
6. We walk the attic with you before we leave. You see the final result. You get a written summary of what was installed, at what depth, to what R-value. And you get your 365-Day Done Right Promise in writing.

The whole process, from first call to finished attic, is usually two to four days depending on scheduling. The install itself is one day. Call (361) 213-9499 and we’ll get you on the schedule.

Blown-In Attic Insulation Pricing in San Antonio

Here’s what blown-in insulation costs in San Antonio as of 2026. These are installed prices, meaning the material, labor, machine setup, and cleanup are included:

Home Size (Attic Area)	Target R-Value	Typical Installed Cost
800 – 1,000 sq ft attic	R-38	$1,800 – $2,400
1,000 – 1,400 sq ft attic	R-38	$2,200 – $3,400
1,400 – 1,800 sq ft attic	R-49	$3,200 – $4,800
1,800 – 2,500 sq ft attic	R-49	$4,500 – $6,500
Top-up over existing insulation	R-19 to R-38	$1,200 – $2,000

Several things move your price within or outside those ranges. Attics with very low clearance, steep roof pitches, or heavy clutter take longer to work in. If you have old knob-and-tube wiring, we won’t blow insulation over it and you’ll need an electrician’s sign-off first, which adds time. If you need Attic Baffles & Ventilation Prep like air sealing done around can lights, plumbing stacks, or the attic hatch before we blow insulation in, that’s a separate line item we’ll identify during the inspection.

If you have existing insulation that’s dry, not compressed, and free of pest damage, a top-up is cheaper than a full removal and reinstall. We’ll tell you if that’s an option for your attic. If it isn’t, we’ll tell you why, in plain words, and show you what we’re seeing.

Estimates are free. The price we quote is the price you pay. And if a repair fails within the first year, our 365-Day Done Right Promise covers a second visit at no cost to you, in writing.

Fiberglass vs. Cellulose: What We Recommend for San Antonio

Both materials get the job done. The choice depends on your attic and your priorities. Here’s the honest comparison:

Fiberglass

• Lighter weight, which matters if your ceiling joists are older or you have drywall from the 1960s or 1970s that might not appreciate extra load.
• Performs somewhat better in our high-humidity months because it doesn’t absorb moisture the way cellulose can.
• Typically costs 10 – 20% less than cellulose.
• Products from CertainTeed and Owens Corning are what we quote most often for fiberglass jobs.

Cellulose

• Denser, which means it blocks airflow better and does a slightly better job at reducing sound transfer from outside.
• Holds its R-value over time with less settling than older cellulose products, though modern manufacturing has largely solved the settling problem.
• Made from recycled paper treated with borate, which also acts as a pest deterrent and mold inhibitor.
• GreenFiber is the brand we specify most often for cellulose in San Antonio attics.

We don’t push one over the other. We quote the product that fits your attic’s construction, your existing insulation type, and your budget, and the written estimate says exactly what you’re getting.

Blown-In vs. Spray Foam: Which One Do You Need?

Short answer: most San Antonio retrofits call for blown-in insulation, not spray foam. Blown-in is the practical choice when you have a vented attic with standard construction and you’re topping up or replacing loose-fill material. It’s less expensive than spray foam, faster to install, and delivers the R-value most homes here need.

Spray foam earns its price tag in specific situations: unvented attic conversions, rooms where you need both insulation and an air barrier, or problematic areas where air leakage is severe. If your attic has those conditions, we’ll tell you. If it doesn’t, we won’t sell you spray foam just because it’s a higher-ticket product. That’s not how Garrett Sloane runs this shop.

Materials matter, but honesty about which material a job actually needs matters more. We stock and install products from eight major brands: Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber. The right product goes in, not just the one we happen to have on the truck.

Why Homeowners Call Aspen Attic Insulation San Antonio

You’re letting someone into your home, often when you’re the only one there. You should know exactly who’s coming before they knock. Here’s what we do differently:

• Your technician’s name and photo arrive before the visit. When you book with us, we send you the name and photo of the person who will show up. When the doorbell rings, you check the face against the photo. If it’s not a match, don’t open the door, call us, and the visit is free. That’s the Threshold Standard.
• Every tech is background-checked and identity-verified. We don’t use day labor. Every technician who wears our uniform has passed a background check and carries a photo ID badge they’ll show at the door.
• The price is in writing before work starts. You’ll never hear “it turned out to be more than we thought” on a job with us. The quote is written, line-itemed, and fixed.
• The guarantee is written, too. Every job carries the 365-Day Done Right Promise covering labor and materials. If something isn’t right, we come back and fix it. Free.
• A live person answers the phone, 24/7. Call at noon or call at 2 a.m., a person answers. If your attic situation is urgent, you’ll talk to a human immediately.

Aspen Attic Insulation has been part of the Threshold Group family since 2002. Each location is independently owned and operated, but every one operates to the same verification and conduct standards. That’s what the name on the truck means.

FAQs – Blown-In Attic Insulation

How much does blown-in attic insulation cost in San Antonio?

Blown-in attic insulation in San Antonio runs from $1.50 to $3.50 per square foot installed, with most full-attic jobs on a typical 1,000 to 1,800 square foot attic landing between $1,800 and $4,800. A top-up over existing insulation usually comes in between $1,200 and $2,000. Your exact price depends on attic size, target R-value, material choice, and attic accessibility. Call (361) 213-9499 for a free written estimate.

Is blown-in insulation better than fiberglass batts?

For retrofit work in an existing San Antonio attic, blown-in insulation is generally better than batts because it fills gaps, corners, and around ductwork without leaving the seams and voids that batts create. Blown-in fiberglass and blown-in cellulose both perform well; the choice between them depends on your attic’s construction and your budget, and we’ll specify the right one in writing.

How long does blown-in attic insulation take to install?

A standard blown-in attic insulation job in San Antonio takes one day from setup to cleanup. Attics with low clearance, heavy clutter, or wiring that needs attention can add time, and we’ll tell you upfront if your attic has any of those conditions.

Will blown-in insulation really lower my energy bill?

Yes. If your attic currently has R-19 or less, bringing it up to R-38 typically cuts the amount of heat entering your home through the ceiling by half or more. For most San Antonio homes, the result is a 10 – 20% reduction in total summer cooling costs, which means the job pays for itself in three to six years. The exact savings depend on your home’s size, your AC system, and your usage patterns, but the physics doesn’t change: less attic heat, less AC run time, lower CPS Energy bill.

Can you come out today?

Depends on the schedule, but call (361) 213-9499 and ask. A live person answers 24/7, and if we can’t get to you today, we’ll find the next available slot that fits your schedule.

San Antonio Homes We Work On Every Week

Our trucks are on the road all over the city and surrounding areas. We’re in Alamo Heights one morning, the Medical Center the afternoon after, and the far west side near SeaWorld the next day. We know the housing stock in Terrell Heights, Castle Hills, Leon Valley, Stone Oak, and the 78209 and 78230 zip codes, including the quirks of 1950s and 1960s ranch homes with low-pitch roofs and tight attic access. We know which subdivisions in the northeast corridor were built with R-11 in the attic and need a full redo rather than a top-up. And we know what a San Antonio July does to an under-insulated house, because we see it every summer.

The insulating conditions in San Antonio are specific: long, brutal cooling seasons, high humidity through the late summer, and relatively short winters where a poorly insulated attic still bleeds heat. Blown-in insulation addresses all of it when it’s installed to the right depth. When we quote you R-38 or R-49, that number comes from the Department of Energy’s climate zone recommendations for this region, not from a guess.

Get Your Written Price: Call Aspen Attic Insulation San Antonio

You know what your energy bills look like. You know the upstairs room that won’t cool. If you’re ready to do something about it, call (361) 213-9499 and we’ll walk you through it. Free inspection, written price before any work begins, and a technician whose name and photo you’ll have before they ever pull into your driveway. That’s the only way we work.

Ask for Garrett Sloane’s team. We’ll take care of the rest.

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