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A fan, in the usual mesh cage, powered by a flexible solar panel, potentially built into the tent fabric (this might qualify as an idea in its own right). When the sun gets up, you don't have to, this fan prevents you getting baked alive in your tent.
These could work
Flexible solar cells [RayfordSteele, Oct 04 2004]
[hjennings] US Patent Link
Portable camping tent structure with built-in overhead electric fan and power source [jurist, Oct 02 2005]
Inventor of above Tent Fan [jurist, Oct 02 2005]
||Apparently Kreuner lives in a tent year-round. Or an igloo?
||In winter you reverse the fans to blow warmer air down, just like a ceiling fan.
||Already been done! Powered by either batteries or solar power is possible. But a plastic fan case lined with 4 D batteries on each side (8 x 1.5v for a 12v fan) and it lasts for the weekend.