Windows - for the winter

This will not work if you are using Windows XP, but will work fine for Windows 95, 98, ME, or 2000. Windows XP does not allow for user modifications and must be used as it was initially programmed. Microsoft claims that Windows XP has better insulation value than former versions, but has not demonstrated any proof.

If your windows is normally behind snow drifts, it may be time to change you screen wallpaper to a spring or summer scene.

The vapor barrier is so things don't happen behind the wall, unseen, but damaging. I don't see that you'd have any problems with your plan.

You might consider Styrofoam panels, see

Only drawback need space to store over the summer.

"VISTA" is an acronym for the top five Windows problems: Viruses, Intrusions, Spyware, Trojans and Adware.

Where is the 'B', as in "blue"?

Yes you can get water damage to your windows. I suggest going ahead with your plan if you like, but go outside from time to time in the morning and see if you see condensation on the windows. I suspect you will have problems, but that depends on many factors.

You might want to do a little more research. Half inch foam board might give you the same R-value as compressed fiberglass, would weather better and be easier to install.

Your concerns make this abnormal 78 degree day with heat not yet activated a little easier to take.

Colbyt

I'd put up foam insulation panels covered in 1/4" masonite on the INSIDE of the window.