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Insulation in Mount Vernon: July highs average about 85°F; January lows average about 21°F; the typical home was built around 1954 (80% before 1980).
In Westchester County, July highs average about 85°F and January lows about 21°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 damaging thunderstorm winds, flash floods and hailstorms in Westchester County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Westchester County was built around 1954, about 72 years ago, and 80% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Westchester County has had 19 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 Westchester County figures — more about homes in Yonkers.
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