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Insulation in McKinney: July highs average about 94°F; January lows average about 34°F; the typical home was built around 2003 (10% before 1980).
In Collin County, July highs average about 94°F and January lows about 34°F, with roughly 41 inches of rain a year.
Over the last 10 years the National Weather Service recorded hailstorms, damaging thunderstorm winds and flash floods in Collin County, with hail up to 4.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Collin County was built around 2003, about 23 years ago, and 10% were built before 1980.
Collin County has had 14 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 Collin County figures — more about homes in Plano.
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