From: WDS 
Newsgroups: misc.consumers.house
Subject: Re: Expected Cost Savings with Window Insulation Kits
Date: Fri, 30 Nov 2007 09:39:54 -0800 (PST)
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On Nov 29, 5:51 pm, KLS  wrote:
> On 29 Nov 2007 20:08:23 GMT, Bert Hyman  wrote:
>
> >jrweiss98155NOS...@NOSPAM.comcast.net (John Weiss) wrote in
> >news:0-idnZBA5dKdhdLanZ2dnUVZ_tijnZ2d@comcast.com:
>
> >> OTOH, if the film is the type tacked/stapled around the entire
> >> outside frame, it may help somewhat better.  However, the offset is
> >> that you won't be able to see well at all out the window.
>
> >Properly applied, they have little effect on the ability to see
> >through the window, although they do prevent you from getting any
> >ventilation by opening the window if it should warm up. The 3M
> >varieties use double-sided tape, not tacks or staples.
>
> And they work very well if you're trying to stop drafts and retain as
> much heat inside the house as possible.  On warm days, they catch a
> lot of the sun's radiant heat, and that continues to exude into the
> room as the outdoor temperature goes down.  We use these on our
> even-older windows (1930!  wow!  old, old, old!), mainly in the attic,
> and they're cheap and effective.

I used these on my old house which was relatively new (late 1980s) but
was somewhat drafty in the winter.  Wow, what a difference.  For the
cost they are definitely worth it.