We did last year and it made a huge difference! Haven't done it yet this year, but this recent cold snap has me motivated to finish the job this weekend.

Someone posted a neat tip last year on the boards: they suggested you light a candle and hold it near your windows. When the candle starts to flicker or goes out, that's where you need to weatherproof. It totally worked - gonna try it again this year!

Have you weatherproofed your windows this winter?