I think this is being over-thunked! If not by the window, say on the
other side, you'd have a room that was 50 degrees on one side by the
window (even more leakage in the old days), and 80 degrees + (F) on the
other! Grandma certainly would not have put up with that! She'd tell you
you'd catch a cold right in the living room... ;)

-Skip

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