I had condensation in my observatory after a night of imaging but solved it now by getting a small column I'll heater which I turn on while I shut up the observatory. This in combination with a plastic barrier ( thick plastic ) underneath the foam flooring as well as the final step of covering all scopes and the mount with a large black plastic bin liner. It's important that the plastic cover is tied tightly with either a bunge cord or rope pull ties. No problems with condensation at all now on any of the equipment. I think just warming the air up at the last few minutes drives out most of my condensation/breath and that really helps.
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