If using campsite power that small electric room heater in the basement should do the trick if not running the furnace. Perhaps while you're in there run the furnace and see if some of that warm air is going into the basement.
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2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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