I wouldn't consider using a camp stove anywhere indoors, even "next to an open window". Same thing goes for "...in the garage, with the garage door open". There's no guarantee that carbon monoxide will drift out of the open window. I was just reading a news article on the Rita death toll--the bodies of five people were discovered in a Beaumont apartment. It was CO poisoning from a generator. Granted, running a generator for hours is different from a small camping stove, but this guy probably thought he was smart by opening a window, too. Beware, CO can take a long time to be eliminated from the bloodstream, so it can build up after repeated exposure, which is highly likely during a disaster. Be safe, use the stove outside.