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Insulation in Princeton: July highs average about 82°F; January lows average about 23°F; the typical home was built around 1972 (62% before 1980).
In Mercer County, July highs average about 82°F and January lows about 23°F, with roughly 42 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 floods, damaging thunderstorm winds and flash floods in Mercer County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Mercer County was built around 1972, about 54 years ago, and 62% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Mercer County has had 18 federal disaster declarations in the last 25 years, most often for severe storms; 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 Mercer County figures — more about homes in Bluefield.
Athens · Oakvale · Bluefield · Bramwell · Peterstown · Northfork · Anawalt · Keystone