During the winter heating season, the lowest you should safely set your residential thermostat is 60 degrees Fahrenheit (15 degrees Celsius) when you are away or sleeping, to prevent water pipes from freezing inside exterior walls. During the summer cooling season, thermostats are not typically set below 68 to 70 degrees Fahrenheit (20 to 21 degrees Celsius) to avoid overworking the air conditioning compressor, preventing ice buildup on evaporator coils, and keeping monthly utility bills manageable. Verification: Check local building codes and pipe insulation guidelines to ensure your minimum setback temperature protects your plumbing.
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