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Insulation in Loudon: July highs average about 88°F; January lows average about 30°F; the typical home was built around 1997 (31% before 1980).
In Loudon County, July highs average about 88°F and January lows about 30°F, with roughly 56 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Loudon 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 Loudon County was built around 1997, about 29 years ago, and 31% were built before 1980.
Loudon County has had 15 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 Loudon County figures — more about homes in Lenoir City.
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