Rigid Foam

For basement and attic windows you don't need to see out of, cover the panes with a piece of foam board glued to -inch drywall. Cut pieces to fit snugly inside the frame, press the foam side against the glass, then simply pop out when you want to let in sunlight.

Shown: Dow ½-inch polyisocyanurate rigid foam sheathing, about $12.50 per 8-4-foot panel, Lowe's
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