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Insulation in Monrovia: July highs average about 89°F; January lows average about 41°F; the typical home was built around 1958 (74% before 1980).
In Los Angeles County, July highs average about 89°F and January lows about 41°F, with roughly 15 inches of rain a year.
Over the last 10 years the National Weather Service recorded flash floods, damaging thunderstorm winds and floods in Los Angeles 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.
The typical home in Los Angeles County was built around 1958, about 68 years ago, and 74% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Los Angeles County has had 67 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Canyon Fire (2025).
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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 Los Angeles County figures — more about homes in Los Angeles.
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