Big issue. Used reflective foil insulation in the walls and ceiling of my ROR to keep out radiant heat in summer - works well enough to protect equipment even on fierce days. I have a small aircon that I run for a few hours before dusk on very hot days to get the interior of the obs down to night temps - can get better seeing if the floor and mount are not hot while trying to image.
Have an issue with humidity - the interior of the obs gets dripping wet with dew some nights and when the lid is closed and the sun comes up, all that water evaporates and then condenses on the mount and mirror (which remain at night temps). Still working on that one - a vent did not help much and next trick will be to run the aircon again in the mornings to dehumidify the air as the sun comes up.
Long term, the disposable chloride laundry dehumidifiers seem to work OK when the lid is closed, provided there is not too much outside air making its way in.
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