If your furnace and water heater are in the basement, then it will be warmer than first floor.
C*d
3 楼
It depends and you need to measure it yourself to make sure exactly how much difference they have. In general basement can be well above freezing point even without heating because if it is mostly under ground, unless you have big windows/doors or leakage.
o*8
4 楼
Thanks a lot for the feedback. The furnace & water heater are both located in the basement, so I guess I do not need to worry.