To reliably prevent household plumbing pipes from freezing during cold winter weather, you should maintain your indoor thermostat at a minimum temperature of 55 degrees Fahrenheit (13 degrees Celsius) or higher, even when you are away from home. If your plumbing pipes run through unheated interior cavities, kitchen cabinets built against exterior walls, or uninsulated basements and crawlspaces, you should leave cabinet doors open and maintain higher indoor ambient temperatures to ensure warm air circulates freely around vulnerable water lines.
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