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Insulation in Gretna: July highs average about 86°F; January lows average about 14°F; the typical home was built around 1998 (30% before 1980).
In Sarpy County, July highs average about 86°F and January lows about 14°F, with roughly 33 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 floods in Sarpy County, with hail up to 4.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Sarpy County was built around 1998, about 28 years ago, and 30% were built before 1980.
Sarpy County has had 17 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm And Straight-Line Winds (2025).
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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 Sarpy County figures — more about homes in Bellevue.
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