My house is about 45 years old. I have a full basement under the house which has 1 heat vent situated right before the family room crawl space. It has a concrete floor (not dirt). Would adding some insulation between the joists under the family room help warm up that room? I already have some insulation in the area above that room. Not sure how much, if any, in the walls. The crawl space is 2 ft 8 in high. It will be hard to maneuver in there. If the answer is yes, what type should I buy? Do you have any other suggestions?