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Insulation in Costa Mesa: July highs average about 83°F; January lows average about 47°F; the typical home was built around 1965 (87% before 1980).
In Orange County, July highs average about 83°F and January lows about 47°F, with roughly 13 inches of rain a year.
Over the last 10 years the National Weather Service recorded floods, flash floods and damaging thunderstorm winds in Orange County, with hail up to 0.7 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Orange County was built around 1965, about 61 years ago, and 87% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Orange County has had 26 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Norte Fire (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 Orange County figures — more about homes in Anaheim.
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