Exactly. Filling the air leaks between your attic and house
"envelope" should be your first order of business, this is also a
major source of energy loss in winter-time, and in summer time the
stack effect runs in reverse to push hot air down into the house.

Fix those air leaks, and there is a school of thought that venting the
attic is not only useless, it is positively harmful (allowing snow to
come in from outside).

You will hear people tell you the house needs to "breathe," referring
to the living space. But that just means you need a house ventilation
system, and then just for spring and fall (the furnace will pull fresh
air in through leaks in the winter). You can get a ventilation system
on the cheap with a bathroom fan on a 24-hour timer.

Eunoia Eigensinn wrote in message ...
Jeff;

Your problem is two-fold.

I'm going to assume that others have answered your ventilation question.

You also need to address the problem of the moisture finding its way into your
attic, and that means finding and sealing the air leaks in your ceiling.