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There is a problem with working out when not to use the cooler depending on outside dewpoint. If you vent your sct with the cooler at 6:00 pm and the temperature is around 25 deg and relative humidity is only 50% you won't have a problem then. The problem starts to occur when the temperature drops. As temperature drops the relative humidity will go up, until you get to the dew point. Only natural.
But what is happening inside your SCT. You have put air in there at 25 deg 50% relative humidity, as the internal temp drops your internal RH will go up and you will get to a point (dew point) where the moisture that was suspended starts to precipitate out and settle on cooling surfaces, particularly glass surfaces.
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