Firewalker11
Brewer
Just a word on the double pane polycarb or plexiglass window. They sell cans of nitrogen and other trace gases for wine preservation. If you were to caulk both of those panels together then puncture a hole for the preservation gas and another hole for gas to escape out the other side and let it flow for a few minutes, you would insert a lot of nitrogen and other trace gases that would keep the condensation from happening between the panes. I doubt that this would be a concern but that would be a very cheap and easy way to inject that gas. You just need to make sure to leave that other hole open for a while while the two panels have a chance to let all the extra pressure escape. Then seal it up.