House water supply pipes are generally considered at risk of freezing when ambient temperatures drop to 20 degrees Fahrenheit (-6 degrees Celsius) or lower for at least six consecutive hours, especially if the pipes are located in uninsulated exterior walls, crawlspaces, or attics. However, wind chill factors and poor home insulation can cause pipes to freeze even at slightly higher temperatures if cold air drafts blow directly across them. Verification: Check indoor thermometer readings in vulnerable unheated rooms during hard winter freezes.
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