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Insulation in Henderson: July highs average about 91°F; January lows average about 42°F.
In St. Martin Parish, July highs average about 91°F and January lows about 42°F, with roughly 62 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 hailstorms in St. Martin Parish, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
St. Martin Parish has had 40 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (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. Martin Parish figures — more about homes in Breaux Bridge.
Breaux Bridge · Parks · Arnaudville · St. Martinville · Carencro · Leonville · Krotz Springs · Broussard