The storm window only covers the front (south side) of the 2 deeps, I still have the open enterance below and on top I have a shallow with a quilt filled with cedar chips and a top enterance . I had moisture on the outer cover and it dripped onto the cedar chips but only about 1/4 in.deep ,

but since I shimed the outer cover and put styrofoam ontop and so far no moisture at all.

that is my big concern if it may get to warm, but this is Wisconsin and it gets cool