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Hi Paul,
I'm ~40Km from the Murray so that shouldn't affect me but I certainly get my share of dewing! It does get ~5 degrees cooler here than say, Adelaide, but the days can be quite comfortable. The mount is under a TeleGizmo cover and gets warm enough to keep dry during the day. It's the mirror dewing up effectively at the bottom of a long dew shield that gets my goat. I'll try just having the fans on while the mirror temp stabilizes and turn them off for imaging and see if there is any change.
I note your comment about possible tube currents from another heater but, with the fans on all the time I had thought that might not be too much of a problem but if I turn the fans off it will definitely be as you say. I will wrap the exposed parts of the tube with some 5mm thick foam and see what effect that might have. The second dew heater can be tested if the wrap has no effect. Finally, I will try and get permission to put up a small RORO shed. I'm renting this house so it might be difficult although I did get permission to put up the pier.
Anyway, many thanks for the thoughts,
Charles
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