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Insulation in Northfield: July highs average about 84°F; January lows average about 17°F; the typical home was built around 1955 (84% before 1980).
In Cook County, July highs average about 84°F and January lows about 17°F, with roughly 38 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 Cook County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Cook County was built around 1955, about 71 years ago, and 84% were built before 1980. The most common roofs on record are shingle asphalt and tar gravel. Homes that age often need updated wiring, plumbing and roofs.
Cook County has had 11 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Tornadoes, Straight-Line Winds, And Floodng (2024).
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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 Cook County figures — more about homes in Chicago.
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