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Insulation in Carthage: July highs average about 79°F; January lows average about 10°F; the typical home was built around 1953 (65% before 1980).
In Jefferson County, July highs average about 79°F and January lows about 10°F, with roughly 42 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, floods and hailstorms in Jefferson County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Jefferson County was built around 1953, about 73 years ago, and 65% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Jefferson County has had 11 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Remnants Of Tropical Storm Debby (2024).
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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 Jefferson County figures — more about homes in Watertown.
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