I finally broke down and airsealed the basement. I bought 1" foam board and cut pieces to foam into place. On the sill beam (old home) I used 1", but in the addition I used 2" foam. Already I've noticed a difference. I pulled a vacuum on the basement and used an inscense stick to look for drafts. Also I mixed mortar and replaced loose or cracked mortar in the stone foundation. Once it gets cold I will be able to tell more of a difference, but so far so good! Our home is at least 150 years old, so it has its issues!