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Insulation in Harris: July highs average about 86°F; January lows average about 16°F.
In Sullivan County, July highs average about 86°F and January lows about 16°F, with roughly 39 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 hailstorms, damaging thunderstorm winds and floods in Sullivan 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.
Sullivan County has had 21 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, Tornadoes, And Flooding (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 Milan.
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