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Insulation in Fairfax: July highs average about 92°F; January lows average about 36°F; the typical home was built around 1970 (75% before 1980).
In Allendale County, July highs average about 92°F and January lows about 36°F, with roughly 47 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, tornadoes and hailstorms in Allendale County, 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.
The typical home in Allendale County was built around 1970, about 56 years ago, and 75% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Allendale County has had 21 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 Allendale County figures — more about homes in Allendale.
Brunson · Sycamore · Allendale · Gifford · Hampton · Ulmer · Luray · Varnville