Every plane I have built I have added Vantec Tornado fans. They haul the heat out from under the panel in the summer to keep the instruments cool and do a great job of clearing the window in the winter. I just bought two and looks like they will fit nicely on each side of the down tubes. I have not seen any CC with fans, does the windows not fog up on a cold winter day while waiting for the engine to warm up? Is there any reason why I should not do this on the CC?