Simple cooling solution for a canvas tent?

[Yeti]

I’m looking for a simple solution to add cooling to a tent for my little godson. He has a couple of medical issues and can’t cope in the heat & humidity but it would be great if I could get him the great outdoors and still be comfortable.

I know it sounds a bit stupid but has anyone ever seen or heard of a simple cooling solution for a canvas tent?

[samson]

Will you be camping with a power source? Makes a big difference if you are. Pretty sure you could run a portable air-conditioner off the mains? They have portable evaporative cooling systems too which are cheaper than the normal kind. You would need to run the hose that normally goes out the window out the tent somehow.

[tanya]

You could try this?