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Insulation in Sunnyvale: July highs average about 95°F; January lows average about 36°F; the typical home was built around 1971 (59% before 1980).
In Dallas County, July highs average about 95°F and January lows about 36°F, with roughly 40 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 hailstorms, flash floods and damaging thunderstorm winds in Dallas County, with hail up to 4 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Dallas County was built around 1971, about 55 years ago, and 59% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Dallas County has had 18 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Storms, Straight-Line Winds, Tornadoes, And Flooding (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 Dallas County figures — more about homes in Dallas.
Mesquite · Heath · Balch Springs · Forney · Rowlett · Garland · Seagoville · McLendon-Chisholm