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I store my 40cm Dob in the shed, covered with a plastic sheet cover over the whole OTA. In the cold climate in Holland it is always on temperature as my shed is not heated. So cooling before an observing session is not needed. I just trolley it out so it is a Grab&Go !
On top of the plastic mirror cover inside the mirror bucket (it is a truss design) I put some newspapers to capture moisture.
I think cold+humidity is worse than hot humidity as in North Qld. Hot humid air of 30C and 90% can take up much more moisture than cold air of 0 C and 90%. But, indeed dry air such as in Western Cape or the Outback is better.
The only thing what you must never do in the tropics is taking a telescope from outdoors to an air conditioned room.
I did this once in Bali and the result was a completely wet Genesis.
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