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In a sealed enclosure design you should be able to use Silica Dessicant. Once the air inside is dry then there is nothing there to form dew or ice.
I'm using that method on the ZWO cooler system. The 1.25" extender has 4 holes in the side which are exposed to another sealed cavity containing 3-4 small gel packs. Works extremely well. Also makes sense to keep the air volume in the enclosure as small as possible, less water molecules floating around to form ice etc and makes the dessicant last longer before you have to cook it for a few hours to dry it out again.
I have plenty of silica packs and keep a small sealed jar of them ready just in case. All the gear at work arrives with several include so I just collect them all.
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