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Insulation in Benson: July highs average about 90°F; January lows average about 32°F; the typical home was built around 2005 (19% before 1980).
In Johnston County, July highs average about 90°F and January lows about 32°F, with roughly 49 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, flash floods and hailstorms in Johnston County, with hail up to 1.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Johnston County was built around 2005, about 21 years ago, and 19% were built before 1980.
Johnston County has had 19 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (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 Johnston County figures — more about homes in Clayton.
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