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I know that glass and similar materials may crack if the heat changes rapidly from over boiling point to cold water temperature. I just think a hair drier wouldn't be so harsh on a window, like from below freezing point to well above in a number of seconds. If it did, I would expect my hair or head to be on fire or burnt.
But if the temperature doesn't change to much, there won't be much risk, I don't think a hair drier would make a huge increase of temperature and rapidly.
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Not if the heat doesn't change too much.
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