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Insulation in Sparks: July highs average about 88°F; January lows average about 23°F; the typical home was built around 1994 (31% before 1980).
In Washoe County, July highs average about 88°F and January lows about 23°F, with roughly 12 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded flash floods, floods and damaging thunderstorm winds in Washoe County, with hail up to 1 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Washoe County was built around 1994, about 32 years ago, and 31% were built before 1980.
Washoe County has had 47 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Bull Fire (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 Washoe County figures — more about homes in Reno.
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