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In my dome which is sheet metal skinned I allow a bit of cool down time with the shutter open. When using the scope though, I don't notice that much in the way of tube currents since the observatory always is the same as the outside temp. It is white skinned meaning it reflects most of the heat away which cools it down, there is also a small gap between dome and base which allows air to circulate. I will be adding a circulation fan to it once I move it to stop dew forming on the inside of the dome. The fan/fans will be solar powered so I don't have to worry about them running at night, when the air is cooler (sometimes)
Insulating an observatory is probably a good idea for comfort of the user and will not heat the observatory up too much. I will be adding sheet polystyrene foam to the walls of the dome and also the base, lined with masonite or MDF to hold it there and make it look good.
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