I looked around the site and found similar questions, but still unsure about how the answers apply to my situation. Here's the setup of my home first: I live in a one story ranch built in the 1956. It has a full basement, which is partially finished (3/4 of it has walls, but no ceiling, and has a the original concrete floor, the other 1/4 is unfinished bare cinderblock walls), but there is no heat installed in the basement. The only heat sources down there are the furnace and hot water heater. Up stairs I have remodeled the kitchen, living room, and one bedroom. This has included all new R-15 insulation in the walls, and R-30 in the attic. The master bedroom has not been gutted yet so it is still original. The insulation that is in the attic in the remaining portion of the house is Vermiculite (yes I know it may be asbestos!) and the walls probably have what the rest of the house had, Balsam wool. the unfinished portion of the basement is underneath the master bedroom and the master bedroom is down a 12' hallway from the remodeled living room. Now here's where my problem lies.....the master bedroom is noticeable colder than the rest of the house. If I leave the master bedroom and walk into the hallway a couple feet the temperature is noticeable warmer. Should I install rigid foam insulation under the floor? I will be remodeling this room eventually, but not this winter. There is fiberglass bats against the sills in the basement, and an insulated door in the bulkhead entrance. I'm just sick of having a cold bedroom!!!