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If you are running the furnace, then it is cool or cold. If the outside temp goes below freezing the water lines in the basement may freeze if there is little or no air exchange in the basement. The manufacturer even has a duct in the basement to aid in this prevention of freezing the lines and the water centre. Also the reuse of living space air rather than outside air from gaps in the belly should help the furnace heat the unit. We bought a ceramic propane heater which uses much less propane than the furnace and is noiseless. However if frigid temps are expected we use the furnace to get that circulation of air in the basement.
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