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Insulation in Hilton Head Island: July highs average about 91°F; January lows average about 40°F; the typical home was built around 2001 (15% before 1980).
In Beaufort County, July highs average about 91°F and January lows about 40°F, with roughly 49 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Beaufort County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Beaufort County was built around 2001, about 25 years ago, and 15% were built before 1980.
Beaufort County has had 21 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.
Bluffton · Port Royal · Beaufort · Hardeeville · Ridgeland · Edisto Beach · Yemassee · Seabrook Island