Heating at floor level will be from a propane furnace, which needs 12V power as well as LPG for operation.
If outlets are in floor, ducting is also in the floor, and should not become disconnected, though it might be blocked as result of manufacturing defect.
If outlets are low in the wall, ducting is tubular and runs inside cabinets and walls, not below floor. Usually each duct runs all the way to the furnace, and if they disconnect, it is often right at the outlet or at the furnace. Back of the furnace should be accessible from inside the cabinet or piece of furniture (bed frame, dinette seat) that hides it. At the outlet end, you should be able to remove the outlet, reach the duct through the opening, attach it to the outlet, and reinstall the outlet; that is often how they are installed initially.
Also look for manual cutoffs.