Good videos nipsip. A portable solution for air cooling is something I'm going to seriously look at.
At a 2019 camp-out the inside of my 4m bell tent reached 40C (104F) at the apex (hot enough that any insects flying into the hot zone fell out of the air dead) and whilst I had my suitcase solar running a Peltier cooler at ground level, the ambient temperature at height of summer still had my battery at 30C.
I only see sun like once or twice a year and it was too damn hot for me so these concepts, especially the non-ice ones, might just do the job - though I note the comment from svetz about relative humidity.
(The weather did break eventually, last day after one week, with the largest storm I had ever heard in over 20 years of using the same site, the gusts really tested the corkscrew ground anchors. It would seem that climate change is making evening camping an extreme sport.)