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The temperature should be set according to your comfort preferences. The temperature at which most people feel comfortable is in the range of 68°F to 72°F. Setting the furnace temperature higher will result in increased operating cost, as heat is lost through air leaks and radiation, especially when the temperatures outside are low and when it is windy.

It is possible to run the furnace at much lower temperatures to save money, in the range of 58°F to 68°F, if one dresses warmly and doesn't mind wearing bulky clothing indoors during the winter.

Remember that thermostats have a built-in temperature hysteresis, or "swing". Whatever temperature you choose, the furnace will operate a degree or two above and below the setpoint, so if you set the thermostat to 70°F, you'll observe the room temperature cycling between, say, 68°F and 72°F. This is normal. The hysteresis value in many electronic thermostats can be adjusted by the user according to preference. A larger hysteresis value results in the furnace cycling less frequently, but running longer once it comes on.

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Q: What is the best temperature to set your furnace?
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