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Insulation in Glen Lyn: July highs average about 82°F; January lows average about 24°F.
In Giles County, July highs average about 82°F and January lows about 24°F, with roughly 43 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 Giles 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.
Giles County has had 12 federal disaster declarations in the last 25 years, most often for severe storms; 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 Giles County figures — more about homes in Pearisburg.
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