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Insulation in Los Altos: July highs average about 84°F; January lows average about 39°F; the typical home was built around 1971 (67% before 1980).
In Santa Clara County, July highs average about 84°F and January lows about 39°F, with roughly 24 inches of rain a year.
Over the last 10 years the National Weather Service recorded floods, hailstorms and flash floods in Santa Clara County, with hail up to 0.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Santa Clara County was built around 1971, about 55 years ago, and 67% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Santa Clara County has had 14 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Severe Winter Storms, Straight-Line Winds, 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 Santa Clara County figures — more about homes in San Jose.
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