[pengaru]

> There are already better "hexayurt" designs for BM better-designed to block/reflect all sunlight, made with foilized foam boards.

Have you ever actually occupied a hexayurt throughout a full summer day at burning man?

My limited experience was that the typical one as executed @BM is just a dark, sweaty, oven. Excellent insulation by itself is a trap. Once you insulate a space with polyiso, you need good ventilation and heat removal. It's not really a good match for something so ad-hoc.

[jdblair]

A hexayurt with a standard window air conditioner powered by a generator is glorious. Ours was tall enough to stand in and also had designer wallpaper. A 12V-powered filtered ventilation system meant the AC didn't need to be turned on until close to noon.

[marssaxman]

How did you affix the wallpaper?

[jdblair]

Wallpaper paste.

[marssaxman]

I am surprised that it sticks! We'll have to try that with ours; the manufacturer logos are not such a pleasant look.

[marssaxman]

You do need ventilation, but that's not hard; a small swamp cooler (plus a box fan) kept us as cool as we wanted to be:

http://www.yurtcooler.com/

[Scoundreller]

Negative, but they appear popular. My guess is that they buy you a few extra hours of coolness in the morning if you open/close openings at the right time. Obvs you don't want to be in a hermetically sealed box ever.