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There is a two inch spiral aluminum duct running from the furnace to the underbelly for heat to try and heat that area. That is not much but it will help. If you are worried about the lines freezing I would suggest you putting a small ceramic heater down in the basement and possibly behind the basement wall into the area where the furnace, water heater and other items are. Make sure the heater has a thermostat on it so it runs only when it reaches a certain temp in there. This is assuming you are plugged into city power and not running of a genie. Do not rely on small electric ceramic heaters to be the only heat in your unit. The furnace has to run to put some heat into the belly to help keep the water lines from freezing.
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