Blown-In Attic Insulation in San Antonio, TX
Blown-in attic insulation in San Antonio typically costs between $1,800 and $4,200 for a standard single-story home, depending on attic size, existing insulation depth, and the material you choose. Most jobs take one day. At Thistledown Insulation San Antonio, you get a written price before we open the attic hatch, and the work is backed by our 365-Day Done Right Promise.
Blown-in insulation is loose fiber, usually fiberglass or cellulose, that gets blown through a hose into every corner and gap of your attic. It settles into a continuous thermal blanket, which is why it works so well in San Antonio attics where heat builds up under the roof for months at a stretch. It is the most common type of Attic Insulation we install, and it is usually the right call for attics with shallow or uneven existing coverage. If you are looking for a broader look at what your attic needs, our Attic Insulation in San Antonio page covers the full picture.
Neil Barron and our crew have been doing this work since 2003 as part of the Cedarwell family of independently owned insulation companies. We treat your house the way we would want someone to treat ours: shoe covers from the front door to the attic hatch, drop cloths across the hallway, and a photo of the clean-up left for you before we pull the van away. Call (903) 437-9164 and a live person answers, any hour, any day.
When You Need Blown-In Attic Insulation
Most San Antonio homeowners do not spend much time thinking about attic insulation until a symptom shows up. Here are the signs we hear about most, and what they usually mean:
- Upstairs bedrooms run 5-10 degrees warmer than downstairs in summer. In neighborhoods like Alamo Heights, Terrell Hills, and Stone Oak, we regularly see attics with 6 inches or less of settled insulation. That is far below the R-38 minimum recommended for our climate, and the heat load shows up first in the rooms directly under the roof.
- Your air conditioner cycles constantly from June through September. San Antonio summers push attic temperatures past 140 degrees. When insulation is thin, that heat radiates down through the ceiling all afternoon and evening, forcing the AC to run far longer than it should.
- You can see the tops of your ceiling joists in the attic. This is the simplest test we know. If you can see the wooden joists, your insulation is below the depth where it does its job. In homes built before 2010, this is common across San Antonio, from older frame houses in Beacon Hill to 1990s builds in Helotes.
- Rooms feel drafty in winter. Blown-in insulation helps both directions. When cold air sneaks through gaps around recessed lights, vents, and the attic hatch, a fresh layer of blown-in fiber seals off those gaps. We see this often in homes around Shavano Park and Hollywood Park, where older insulation has settled unevenly.
- Your energy bills creep up year over year without a clear reason. Insulation does not last forever. Fiberglass compresses. Cellulose decomposes slowly. If nobody has touched the attic in 15 or 20 years, the thermal barrier is probably thinner than it used to be.
- You are finishing a room, adding recessed lights, or replacing a roof. Any time a contractor cuts into the ceiling or the roofline, insulation gets disturbed. It is the right moment to top it off or replace it entirely. We work with homeowners in Cibolo, Schertz, and Converse through these transitions regularly.
Our Blown-In Attic Insulation Process
We explain before we act. Here is exactly what happens when you schedule blown-in attic insulation with Thistledown Insulation San Antonio:
- We talk first, and we listen. You tell us what you are noticing: hot rooms, high bills, noise from outside, whatever it is. We ask about your schedule, your kids’ nap times, and any product preferences. We can match insulation to your household, including pet-safe options where a choice exists.
- We measure and inspect the attic. Our technician goes up, takes depth measurements in multiple spots, checks for air leaks around the hatch and penetrations, and notes anything that affects the job: recessed lights, bathroom fan vents, weird framing, rodent activity.
- You get a written price. Not an estimate range. A written number that covers the full scope. Your exact cost is on paper before we touch a rafter. No surprise line items, no materials upcharge drama, no pressure.
- We prepare your home before the hose comes out. Shoe covers go on at the door. Drop cloths run from the entry to the attic hatch. We keep our tools quiet when children are sleeping. If the dog is home, we ask where it is most comfortable and we work around it. Our products from CertainTeed, GreenFiber, and others give us choices, and we pick the one that fits your house and your family.
- We blow the insulation to the right depth, evenly. We install to R-38 or better in most San Antonio attics, covering every corner and edge, around framing and vent baffles, and sealing gaps as we go. The hose is fed from the truck outside; inside, the work is controlled and clean.
- We clean up, photograph it, and walk you through it. We put the attic back in order, remove the drop cloths, and sweep anything that needs sweeping. Before we leave, we take a photo of the finished attic and the cleaned-up floor below. You see the proof before the van pulls away.
If anything is not done right, our 365-Day Done Right Promise means we make it right. No debate, no fine print. Neil Barron stands behind every job personally.
Blown-In Attic Insulation Pricing in San Antonio
Honest numbers matter. Here is what blown-in attic insulation typically costs in the San Antonio area, based on the projects we have completed across the city and surrounding communities, and how it compares to attic insulation cost in 2026:
Typical Blown-In Insulation Costs in San Antonio
| Project Scope | Typical Price Range | What Is Included |
|---|---|---|
| Top-off existing attic, 800-1,200 sq ft | $900 – $1,800 | Blown-in fiberglass or cellulose to bring total depth to R-38; basic air sealing around hatch |
| Full replacement, 1,200-1,800 sq ft | $1,800 – $3,200 | Removal of old insulation (if needed), air sealing, new blown-in to R-38 or R-44 |
| Full replacement, 1,800-2,500 sq ft | $2,800 – $4,200 | Removal, air sealing, new blown-in, vent baffles checked and replaced as needed |
| Add-on: attic hatch insulation and weatherstripping | $150 – $350 | Sealing the hatch is the single highest-value upgrade in most attics |
Several factors move the number. Attic access matters: a tight staircase or a small scuttle hole means slower work. Existing insulation condition matters: if it is damp, rodent-damaged, or packed with dust from decades of San Antonio wind, removal and disposal adds cost. Ceiling height and roof pitch affect how long the job takes. The number of recessed lights, can lights, and bathroom fans affects how much air sealing and attic baffles and ventilation prep we need to do.
What does not change: you get a written price before we start. Every single time. No estimate ranges that balloon after the hose is already running. Call (903) 437-9164 and we will come look at your attic and give you the real number.
FAQs – Blown-In Attic Insulation
How much does blown-in attic insulation cost in San Antonio?
Blown-in attic insulation in San Antonio typically costs between $1,800 and $4,200 for a full job, and between $900 and $1,800 for a top-off on an existing attic. The exact number depends on your attic’s square footage, current insulation depth, access, and whether any old material needs removal. Call (903) 437-9164 for a precise written quote; estimates are always free.
Is blown-in insulation better than batt insulation for San Antonio attics?
For most San Antonio attics, yes. Blown-in insulation fills irregular spaces, corners, and gaps around framing far better than batts, and it is faster to install to a consistent depth. In our climate, that continuous coverage matters because any gap becomes a heat channel in August. Attic batt insulation has its place, but about 80% of the attic work we do in San Antonio is blown-in.
Can you install blown-in insulation the same day I call?
We cannot always start the same day, but we can almost always schedule within 24 to 48 hours, and emergency situations are often same-day. A live person answers our phone 24/7, so call (903) 437-9164 and tell us what is going on; we will give you a straight answer about scheduling and a written price before any work starts.
Is blown-in insulation safe for kids and pets?
Yes. We use products from CertainTeed, GreenFiber, and others that are widely used in family homes, and we choose pet-safe insulation options where a choice exists. After installation, the material stays in the attic, not in your living space. We keep the work area clean and contained, and we leave a photo of the clean-up before we leave. If you have specific product concerns, we walk you through exactly what we are installing and why.
How long does blown-in attic insulation last in the San Antonio climate?
Fiberglass blown-in insulation lasts 30 years or more. Cellulose typically lasts 20 to 30 years before it settles enough to matter. San Antonio’s heat does not destroy insulation, but it does accelerate settling, which is why we recommend rechecking depth every 5 to 7 years. If you are not sure how much you have up there, we will measure it when we visit; the inspection is free.
Do you remove old attic insulation before blowing in new material?
Sometimes. If the old material is damp, moldy, compacted, or contaminated by pests, removal is the right move. If it is just thin but otherwise dry and clean, we blow new material on top. We tell you which situation you have, and the written quote reflects whichever path we recommend. No surprises, no upsell tactics.
Will blown-in insulation make my San Antonio home quieter?
Yes, moderately. Attic insulation absorbs some sound from outside, especially rain on the roof and wind noise. Blown-in fiber and cellulose both help more than you might expect, particularly in upstairs rooms. It is not soundproofing, but it takes the edge off San Antonio thunderstorm season.
Written by Neil Barron, Owner at Thistledown Insulation San Antonio, serving San Antonio.