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Insulation in Sylvester: July highs average about 85°F; January lows average about 25°F; the typical home was built around 1978 (52% before 1980).
In Boone County, July highs average about 85°F and January lows about 25°F, with roughly 48 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, flash floods and floods in Boone County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Boone County was built around 1978, about 48 years ago, and 52% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Boone County has had 24 federal disaster declarations in the last 25 years, most often for severe storms; 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 Boone County figures — more about homes in Madison.
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