I would like to bring up 12/2 cable to put a 110 20A electrical outlet on the wall. The house is old and there is not enough space behind the drywall to put a box (it is an outside wall and there are not any outlets in it). In addition, I tried elsewhere on this wall to drill a hole down to the floor below but was unable to get it. So, I'd like to bring up a cable from the floor in front of the wall and install a surface mount box with an outlet. How should I go about this? BX cable? Conduit between floor and box?
The outlet will be for a portable air conditioning unit in the summer and space heater in the winter, thus the sole outlet on the circuit.