Pelts are very ineffecient, and they get worse the colder you run them. I don't know what the practical limit is. There are charts on google for common TEC elements. Look up one around your size and look where the dissipation you're interested in (plus a lot for leaked heat and divided by the number of elements you'll be useing) intersects temperature.
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I have another question though, sorry if it's posted somewhere else in the forums and I couldn't find it: What's the best way to avoid moisture in systems operating below the dew point?
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Insulation. But its not a big concern since you'll have to insulate the hell out of your loop before you'll even get to the point where its condenseing anything