condensation

I had condensation on windows on both my RV and my Pod during cool nights.  I found a really good insulation product at Home Depot.  It is a roll of aluminized mylar bubble material (similar to the bubble material used in packing).  It is slightly stiff when unrolled.  I carefully cut the material to the same dimensions as the interior window framing.  I can simply unroll the cut sheet and pop it into the window frame.  Because of its mirror coating, the bubble material acts as an opaque night shade and because of the air containing bubbles, it is a very good insulator.
I have also used it during the summer, when it was very hot and sunny out.  I would install the
shade on the sunny side of the Pod...it made a lot of difference in keeping the sun from overheating the interior (the Pod curtains really only give privacy not insulation).