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Insulation in Boonsboro: July highs average about 87°F; January lows average about 23°F; the typical home was built around 1971 (59% before 1980).
In Washington County, July highs average about 87°F and January lows about 23°F, with roughly 41 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, floods and hailstorms in Washington County, with hail up to 4 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Washington County was built around 1971, about 55 years ago, and 59% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Washington County has had 12 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (2026).
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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 Washington County figures — more about homes in Hagerstown.
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