"Bettina" writes:

We live in an old building, and cold air pours in through the sash
windows -- especially that place where the top and bottom come together.

I've been told there's a special foam-like caulking compound that peels off
when you raise the windows in the warm season.

Can anyone tell me the name of this product and where I can get it?

Dunno, but I will say that my experience with 3M window film has been
extremely positive in the last old place I lived that had lousy
windows. If the aesthetics aren't a killer for you, the 3M window
film kits are extremely effective in decreasing draftiness. And do
buy 3M--they're worth it over the no name kits whose tape never seems
to hold up like 3M's.

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Todd H.
http://www.toddh.net/