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Insulation in Cumming: July highs average about 88°F; January lows average about 32°F; the typical home was built around 2004 (8% before 1980).
In Forsyth County, July highs average about 88°F and January lows about 32°F, with roughly 56 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Forsyth 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 Forsyth County was built around 2004, about 22 years ago, and 8% were built before 1980.
Forsyth County has had 12 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Hurricane Isaias (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.
Sugar Hill · Buford · Rest Haven · Milton · Suwanee · Alpharetta · Flowery Branch · Johns Creek