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Aiden, I have a fairly large (in floor area anyway) obs - 5x4 metres with a hip roof. And I'm in the bush. To deal with the heat, I fitted a second roof on top of the original - separating the two with heaps of insulation. It dropped ambient inside the obs down by a considerable margin. Neever actually measured it but it was enough to justify the effort and expense.
As for condensation, there's not a lot you can do when the roof is open except for dew bands on the scopes etc. When the roof closes, and the equipment is wet from a night in the open, I make sure to put enough covers over the gear to keep dust off the optics but I don't put lenscaps etc back on so what dew there is can evaporate away and that's as much as I can do with major interventions such as dehumidifiers. I figured those are only going to be effective if your obs is well sealed. Mine isn't. I prefer to encourage airflow.
Peter
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