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Insulation in El Cajon: July highs average about 90°F; January lows average about 41°F.
In San Diego County, July highs average about 90°F and January lows about 41°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 San Diego County, with hail up to 1 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
San Diego County has had 35 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Severe Storm And Flooding (2024).
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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 San Diego County figures — more about homes in San Diego.
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