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DewStop switch can help by turning the fan on or off automatically in response to humidity and dew-point levels so it runs just long enough to prevent condensation from forming on the walls and ceiling. The switch can also be operated manually and has a 30-minute timer. A fan-only switch costs about $50, a fan-and-light switch about $60.

GTR Technologies, 360/876-2974, dewstop.com.