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Dave , a couple of thoughts...
One possible problem with cooling is that it can cause extra dew to form, normally this is on the cold plate since it's the coldest part of the system. If the cold plate is above the mirror then you'll get water dripping onto the mirror.
Ice packs are an interesting idea, but I'm not sure you can control them well enough,. But it might be an idea if you don't have power at your site.
cheers, Bird
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