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Insulation in Garrett Park: July highs average about 87°F; January lows average about 25°F; the typical home was built around 1978 (52% before 1980).
In Montgomery County, July highs average about 87°F and January lows about 25°F, with roughly 45 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, floods and flash floods in Montgomery County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Montgomery County was built around 1978, about 48 years ago, and 52% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Montgomery County has had 14 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 Montgomery County figures — more about homes in Gaithersburg.
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