Try to minimize any air exchange with cords or lines running through your lid or collar.
Also, many of us use damprid or something else. I have one of those small dehumidifiers that you can plug into the wall after awhile to dry out the stuff that collects moisture:
Eva-Dry E-500 Renewable Wireless Mini Dehumidifer 1
And finally, many of us use small computer fans to keep air circulating.