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Hi Al,
You have probably thought of this already, but it wouldnt hurt to have a lower vent open in the floor or down as low as you can when the solar fan is running to be able to provide a cool source of air and circulate the cool air up through the top vent.
I know when I put my whirlybirds on the house, they did pretty much nothing until I put some eaves vents on the shady side of the house and then the temperature differential went from 5 deg lower than ambient to 15 degrees.
Of course, this may not be needed if there is already good airflow from under or through floorboards etc, but I thought I might mention it anyway.
By the way, how do you keep warm if there is no slit and half the pod is open to the sky? Are you able to heat inside (bar heater etc) without causing too many thermal currents?
Cheers
Chris
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