I love this idea and would like to test it in my Sun Room. It can get to be 100 out there, even though we have 2 skylights and windows on three sides.
Without insulation it just heats up. Don't get me wrong, that's not always a bad thing. It make the room usable for a good 3 seasons and even when it is steamy hot, it's actually feels really good after coming in from the pool.
But anything non-electric, DIY and just plain cool I'm up for trying.
Let your imagination run wild!