non-heat sensitive polycryo alternatives?

Nylon or polyester (mylar) films might be able to withstand the heat in your mid, depending on the spatial arrangement of things. Note that "hard" films like nylon or mylar will become clouded with wrinkles over time, so it wouldn't afford you a perfectly clear (glass-like) view outside. "Softer" films like PVC tend to be clearer and have fewer creases, but they also have lower melting points.

If your standards for the quality of the view are low (if you just want the window to check on weather, but not to take in the beauty, for example), and you don't mind an amber/orange tinted material, you could always use Kapton film. It's very strong and will tolerate temperatures that would destroy your tent. There are usually sheets of it on ebay. You'd want 5 mil (0.005") thickness, I would think.

Thanks Chris,

I spoke with some others and realize it takes a decent amount of heat to shrink polycryo. I may be able to place a panel on the opposite side of a mid from the stove. Basically a view is my priority.