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Yes the last thing you want is for the scope to get so cold that when you take it out of the box the corrector fogs up instantly. Also if the internal air is colder than the outside it may "suck" warmer moister air inside and fog it up inside which would be worse than no cooling.
Maybe a temperature switch that will interupt the power going to the peltier rather than try to thermostatically control the peltier directly
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