I am thinking of insulating my living room floor. My house is 140 years old on a rock foundation. This room has exterior walls on the south east and west sides. Their is one register in the north east side of the room for the heat to migrate through. The crawl space below was used for a cellar. It worked great many years ago for this. Above this room is the master bedroom so insutlating the celing would require removing dry wall. The floor is cold in the winter. It is approximately 15x15. Their is very little pipes and wiring to work around.
Would it be worth my money to insulate the underside of the floor?