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Insulation in Pearl River: July highs average about 91°F; January lows average about 41°F.
In St. Tammany Parish, July highs average about 91°F and January lows about 41°F, with roughly 64 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, flash floods and tornadoes in St. Tammany Parish, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
St. Tammany Parish has had 36 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Tropical Storm Arthur (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 St. Tammany Parish figures — more about homes in Slidell.
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