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Insulation in St. Augustine Beach: July highs average about 91°F; January lows average about 46°F; the typical home was built around 2006 (10% before 1980).
In St. Johns County, July highs average about 91°F and January lows about 46°F, with roughly 52 inches of rain a year. That much heat keeps air conditioners running hard for months, so a yearly tune-up pays off.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and floods in St. Johns County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in St. Johns County was built around 2006, about 20 years ago, and 10% were built before 1980.
Florida Building Code, 8th Edition (2023). Florida writes its own statewide building code, updated every three years, with strong wind-load rules for roofs, windows and doors.
St. Johns County has had 26 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Hurricane Milton (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 St. Johns County figures — more about homes in St. Augustine.
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