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Insulation in Universal City: July highs average about 95°F; January lows average about 41°F; the typical home was built around 1992 (38% before 1980).
In Bexar County, July highs average about 95°F and January lows about 41°F, with roughly 31 inches of rain a year. That much heat keeps air conditioners running hard for months, so a yearly tune-up pays off.
Over the last 10 years the National Weather Service recorded hailstorms, flash floods and damaging thunderstorm winds in Bexar County, with hail up to 5.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Bexar County was built around 1992, about 34 years ago, and 38% were built before 1980.
Bexar County has had 25 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Storms, Straight-Line Winds, Tornadoes, And Flooding (2026).
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Uneven rooms, high bills and an attic you can see the joists in are the signs; older homes often have far too little.
Attic insulation and air-sealing usually pay back fastest.
These are Bexar County figures — more about homes in San Antonio.
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