I have a similar setup but it's a small tin shed and 'inside' temp is pretty much the same as outside temp so I have not seen a problem with air currents. I does seem to help with dew a little although I run a heater on the scope body but it does help keep the rest of the Ob drier.
I'm normally bundled up and sitting over by the PC desk but if there was any body heat issues I doubt that you would even notice it.
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