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Insulation in Antioch: July highs average about 86°F; January lows average about 40°F; the typical home was built around 1970 (63% before 1980).
In Contra Costa County, July highs average about 86°F and January lows about 40°F, with roughly 19 inches of rain a year.
Over the last 10 years the National Weather Service recorded floods, hailstorms and damaging thunderstorm winds in Contra Costa County, with hail up to 0.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Contra Costa County was built around 1970, about 56 years ago, and 63% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Contra Costa County has had 9 federal disaster declarations in the last 25 years, most often for floods; the latest was Severe Winter Storms, Flooding, Landslides, And Mudslides (2023).
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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 Contra Costa County figures — more about homes in Concord.
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