Elevation is the multiplier. At about 6,200 feet, freeze and thaw cycles swing wider and bite longer than in lowland towns, and supply lines in exterior walls, garages, and crawlspaces see the full swing. Copper that survives a mild winter fatigues across several hard ones, and the split often announces at the thaw, when the ice plug melts and the line runs at full pressure. The repair visit should map which runs sit in cold walls, because insulation and heat tape on the survivors is cheaper than the second cleanup.
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