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Insulation in Duson: July highs average about 92°F; January lows average about 42°F.
In Lafayette Parish, July highs average about 92°F and January lows about 42°F, with roughly 63 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 Lafayette 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.
Lafayette Parish has had 32 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 Lafayette Parish figures — more about homes in Lafayette.
Rayne · Scott · Cankton · Lafayette · Maurice · Carencro · Crowley · Church Point