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Insulation in Greenwood: July highs average about 84°F; January lows average about 20°F.
In Johnson County, July highs average about 84°F and January lows about 20°F, with roughly 45 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, hailstorms and tornadoes in Johnson 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.
Johnson County has had 13 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.
New Whiteland · Whiteland · Southport · Homecroft · Bargersville · Beech Grove · Franklin · Warren Park