On 25-Oct-2004, "Walter Cohen" wrote:

Part of the reason I leave the window open constantly is to help prevent ice
dams in the winter.

In the long run, it will probably be cheaper to insulate more and prevent
ice dams that way. Ice dams are a sign of insufficient insulation.

Would it be better to insulate the walls between the heated rooms and the
attic space and continue to leave the window open?

One way or the other you should look at fixing the insulation. Either
enclosing and insulating the empty space or insulating the empty space
to separate it from the heated space. Decide which is cheaper/easier.
Take care of the venting while you're at it.

Mike