
Concho Valley hub, Tom Green County seat
Spray Foam Insulation in San Angelo, TX
Attic sealing and insulation for a city that hit 100F on 100 days in 2011.
- Free estimates after an on-site look
- Written quotes that name foam type, thickness and R-value
- Attic leaks, ducts and old insulation checked before we cover anything
Insulating the Heart of the Concho Valley
Spray foam insulation in San Angelo starts with understanding how hot the place gets. Wikipedia's climate summary for the city says it reaches 100F on about 30.1 days in a typical year, and in 2011 it recorded 100 days at that mark. Average July highs run 96.0F. An attic under that sun can run far above the outdoor temperature, and most local houses have their ducts up there. The result is cooling that leaks into the attic and ceilings that radiate heat into bedrooms.
A city of every era
San Angelo grew around Fort Concho, which the U.S. Army founded in 1867 at the junction of the North and South Concho rivers. Railroads, ranching, the oil boom and Goodfellow Air Force Base each added a wave of homes. The 2020 census counted 43,316 housing units in the city. On one drive you can pass early frame houses near downtown, brick ranches from the 1950s through the 1970s, and newer homes on the city's edges. The older the house, the more likely it has thin attic insulation and open framing between walls and attic.
Cold nights matter too
The same climate record shows about 60 days a year with lows below freezing and a record low of -4F. Air sealing that keeps summer heat out also keeps winter heat in. That is one reason we put sealing ahead of adding depth.
What we usually recommend
For a house with an open, reachable attic floor, we seal the ceiling and blow in fiberglass or cellulose to the R-38 or R-49 range that code and ENERGY STAR point to for Zone 3. For a house with lots of attic ductwork or a low-slope roof, we price open-cell foam on the roof deck so the ducts sit inside the conditioned space. Garages under bedrooms and steel shops out back usually get closed-cell.
Lakes and river neighborhoods
The city has three lakes nearby, Twin Buttes, O.C. Fisher and Lake Nasworthy, and homes near them and along the Concho River see the same heat as the rest of town. The difference is often age and layout: lake houses and older river-area homes tend to have additions and converted spaces that need individual attention.
Questions we hear from San Angelo homeowners
People usually call after a summer electric bill, a hot bedroom over the garage, or a home inspection that flagged thin attic insulation. Buyers of older homes near downtown and the river often want to know whether the walls have anything in them; we can test a few cavities and tell you. Owners of newer homes in the south and southwest parts of town are more often chasing one or two rooms that never match the thermostat, which usually traces back to a duct run, a kneewall or a bonus room over a garage.
Tell us what part of the house is uncomfortable, and we will look and give you a written plan. Get a free estimate
What to Know in San Angelo
- Days over 100F. San Angelo reaches 100F on about 30.1 days a year on average and recorded 100 such days in 2011 (Wikipedia climate section).
- Housing count. The 2020 census counted 43,316 housing units in San Angelo, 8.9% of them vacant, with a homeowner vacancy rate of 1.7%.
- Climate zone. OpenEI lists Tom Green County as ASHRAE Climate Zone 3B; the 2015 code Texas uses calls for R-38 ceilings in Zone 3.
- Freezing nights. The city averages 60.3 days with lows below freezing, and its 1991-2020 table shows a record low of -4F.

San Angelo Questions
Are San Angelo attics really that much hotter than outside?
On sunny summer afternoons, an attic under a dark roof routinely runs well above the outdoor temperature. With ducts in the attic, that heat is what your air conditioner fights all day.
Should I insulate before or after replacing my AC?
Before, if you can. A sealed, well-insulated attic can change how much cooling the house needs, which matters when sizing a new system.
Do you work near Goodfellow and Lake Nasworthy?
Yes, we work throughout the city, including neighborhoods around the base, the lakes and the river.
Do I need a permit to insulate my attic in San Angelo?
Adding insulation to an existing attic is usually simple, but work that is part of a remodel or addition generally falls under that project's permit. If you are unsure, check with the City of San Angelo's building office before work starts.
Free Estimates in San Angelo, TX
Free on-site estimates in San Angelo.
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