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Insulation in Bluff City: July highs average about 86°F; January lows average about 27°F; the typical home was built around 1969 (64% before 1980).
In Sullivan County, July highs average about 86°F and January lows about 27°F, with roughly 46 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Sullivan 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 Sullivan County was built around 1969, about 57 years ago, and 64% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Sullivan County has had 8 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 Sullivan County figures — more about homes in Kingsport.
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