I've now looked into this, and you're correct. I am hoping with the dog door, and the other doors being a little drafty it will eliminate some of that issue. In addition, with two garage doors opening and closing a few times throughout the day it might help. I guess I will keep a close eye on this and if I start to notice anything, it will be easy to run some more gas line and put a vented heater in. In the end it was a knee jerk reaction when the electric heater started running non-stop because it wasn't blowing as hot as usual and all could think about was the bill being over $300 once it starts getting really cold.