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Insulation in Alton: July highs average about 97°F; January lows average about 49°F; the typical home was built around 1999 (13% before 1980).
In Hidalgo County, July highs average about 97°F and January lows about 49°F, with roughly 23 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 damaging thunderstorm winds, hailstorms and floods in Hidalgo County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Hidalgo County was built around 1999, about 27 years ago, and 13% were built before 1980.
Hidalgo County has had 24 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Storms And Flooding (2025).
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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 Hidalgo County figures — more about homes in McAllen.
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