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I know where you are coming from, and I too had that problem and this is what i did.
On those very cold nights and after imaging/observing I would close the observatory, do not put any caps on etc or cover anything .
I had power to my observatory and would run cheap K Mart fans on low and swiveling in the observatory till morning or until dry, or just run a extension lead.
Actually I had two running 24 hours a day for years on end, summer or winter hardly use any power and cheap to buy when they start rattling and need to be replaced.
Constant air flow dose dry things out, and once dry put your caps back on and cover if you wish.
My set up was pretty expensive and it did the job for me perfectly.
Leon
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