I'm about ready to insulate my basement. However, I do not know what to do in my furnace room (natural gas furnace and water heater). Presently there are poured concrete walls and no ceiling. A bedroom is directly above it and it is the coldest room in the house (plus it is the north west corner of the house). I will be using rigid foam insulation in the rest of the basement. Can I use the same in the furnace room? Are there different regulations? What are the do's and dont's when insulating a furnace room? Thanks