I have metal windows in my unfinished basement and would like to insulate them for the winter. I tried the 'shrink wrap' and it wouldn't stick to the metal or concrete. Any suggestions? Thanks

 

A lot of people will just cut some rigid foam board that will fit tightly inside the opening and press it into place, letting friction hold it in. Of course, that won't let light through. If you needed light, you could do the same thing, but cut an opening in the foam, leaving, say... 4" of foam around the edge of the opening. Then wrap some plastic around the foam board and press it into place so that the plastic is between the foam and the window.

They also make certain kinds of caulking that are removable, and are suitable for caulking shut something that you want to reopen again come Spring.

 

Consider replacing them with double insulated vinyl windows. MUCH higher insulation value, no drafts, not terribly expensive, just plain better than those cold drafty steel windows.