终于又在Google上找到家里冬天白天和晚上温度的依据啦，哈哈

What Temperature Should You Set Your Thermostat to in the Winter?

For winter, the ideal thermostat temperature is 68 degrees Fahrenheit when you're at home. Energy.gov 68 degrees is a good room temperature while you're awake at home, but recommends lowering it while you're asleep or away. Lowering your thermostat 10-15 degrees for eight hours can reduce your heating bill by 5-15%.

https://www.constellation.com/energy-101/best-thermostat-types-and-settings.html#:~:text=For%20winter%2C%20the%20ideal%20thermostat,bill%20by%205%2D15%25.?