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Insulation in Fort Mill: July highs average about 90°F; January lows average about 31°F; the typical home was built around 2003 (20% before 1980).
In York County, July highs average about 90°F and January lows about 31°F, with roughly 44 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in York County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in York County was built around 2003, about 23 years ago, and 20% were built before 1980.
York 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 York County figures — more about homes in Rock Hill.
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