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Insulation in Allendale: July highs average about 86°F; January lows average about 22°F; the typical home was built around 1954 (78% before 1980).
In Bergen County, July highs average about 86°F and January lows about 22°F, with roughly 48 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 flash floods, damaging thunderstorm winds and hailstorms in Bergen County, with hail up to 2.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Bergen County was built around 1954, about 72 years ago, and 78% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Bergen County has had 19 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Remnants Of Hurricane Ida (2021).
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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 Bergen County figures — more about homes in Hackensack.
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