Originally Posted by Wuzzat?
Here's what I did but I never got a chance to test it because we never had a repeat of that flukey winter several years ago where everyone here at 39N had ice dams.
We had a t'stat-operated gable attic fan for ventilation in summer to reduce the A/C bill. No temp. difference between roof underside and ambient air = no ice dam, so I ran a switch w/pilot light bypassing the 'stat so I could run the fan in winter.
You have to have a well insulated attic floor to preserve the comfort of those below, and if you have that you don't really need an attic fan in the summer.
The attic is a livable area, there is a bedroom and den up there.
Plus the roof doesn't have an over hang at all.
I'll try to get some pics or a drawing.