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Also, some people have medical conditions that do make sudden changes in temperature a major problem. I have asthma, and the shock to my system of a rapid drop in temperature gives me one of my most severe kinds of asthma attacks. When I was in Turkey the summer before last, just jumping into the ocean gave me a killer wheeze, and the Aegean is not that cold! I won't even go into how much trouble I had going to university in Ontario, where temperatures in winter regularly drop to -20 C.
So, while getting sick from opening a window wouldn't be a concern for everyone, respiratory conditions like asthma are common enough that opening a warm dance studio window on frigid outside air doesn't seem to me to be safe practice for a room full of people of unknown medical backgrounds.
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