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I have not experienced any thermal issues with my scope (a 10" dobsonian), which I store in my basement. If it is particularly cold outside (which is usually the case), I just let it equalibriate longer. Up to 2 hours to go from +20 to -20 C. I have recently installed a fan, and that should shorten the cooling time considerably. I have even experienced temperature drops of a couple degrees during observing, and not noticed any image degredation.
p.s. It sounds like you live in a great location to do some good observing!
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