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You're in FL. Are you trying to keep the room from getting too hot or from getting too cold? Some of the windows in my house leak like sieves so I just tape 3-mil clear plastic over them late in the fall, and that stops the cold drafts but still lets light in.
If overheating is the concern then you need to stop sunlight from entering the room. My south-facing windows all have thermal tint applied to the outside panes so that light can enter but IR (heat) is reflected. It makes a noticeable difference in the summer.
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