Someone linked this page on using Bubble Wrap to insulate windows on the Frugal Village board I visit often.
These sounds like such a great frugal idea to help with the heat loss we experience. Our bedrooms are all on the North-East corner of the house, and they will get cold in the winter. During the day I can keep the heat down at 62/64 degrees since we only use two rooms, but some nights last winter it seemed as if the heater ran all night just to keep the house at 67 degrees. I already use heavy winter curtains and shades, but feel like I need more.
With our limited budget this is something we can afford to do. If I hadn't been giving the kids the bubble wrap we have gotten recently to play with I could probably do this for free. Oh well, I'm shopping today and will pick up a roll.