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Personally, air conditioning a backyard observatory is going to be costly as most are uninsulated to allow rapid cooldown after sunset. Heat extraction is going to cost less. If its feasible remove the scope during hot days or only put it out there when your going to be using it. A dehumidifier is a must in my opinion for all obs but put it on a timer - turn it on for an hour or two after you close the roof and maybe an hour in the morning, the heat extractor will do the rest.
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