We have a 1971 Ranch in Rockland County New York. The basement and garage are below grade. Only the garage doors are accessible from the driveway. I've been reading old threads and many people are recommending spray foam insulaton to solve the cold-room-over-the-garage problem. Has anyone done this and had positive results? Our bedrooms are 8 to 10 degrees colder than the rest of the house because of this. The garage has insulation in the ceiling, possibly R11, with drywall over it and exposed cement block foundation walls. We have forced air heating and cooling AND (this is bizarre to me)a vent into our garage. I was thinking of rigid insulation on the cement block walls (to further insulate) and patching the vent(because fumes enter the house from this opening). I wanted to tear down the drywall and old insulation and replace it, but my husband disagrees and thinks it's a waste of money. Am I on the right track?