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Insulation in Dering Harbor: July highs average about 82°F; January lows average about 24°F; the typical home was built around 1991 (34% before 1980).
In Suffolk County, July highs average about 82°F and January lows about 24°F, with roughly 46 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, flash floods and hailstorms in Suffolk County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Suffolk County was built around 1991, about 35 years ago, and 34% were built before 1980.
Suffolk County has had 23 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Storm And Flooding (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 Suffolk County figures — more about homes in Lindenhurst.
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