I think it's pretty high, but I'd like to see what other people think. That's like normal daytime temperature for me right now and I'm concerned about that, too.
Fish tanks for our local fish species often require cooling, but I have no idea how it could be done in a terrarium. Improving ventilation has helped for me in the past, but it's still not a great solution. Depending on the cause of the problem, it might not help at all.
Ok, so I have a few ideas that I'd like to test, but I'd rather keep them to myself.
All I've come up with is the AC, which in our case we only got because it seemed more economical than chillers for several fish tanks (at the time)
we don't keep our AC set that low either and I'm a bit worried about the crested gecko and the tarantula
additionally the lizards like it hot, so I'm heating their cages in the ACd room - what an energy waste
can't wait for Stefan's ideas - I imagine they're a step up from tossing ice cubes in the fish tank
rhea "you cannot depend on your eyes when your imagination is out of focus" Mark Twain
Expensive and overly complicated and require an external water pump. I'm not going to go into the details of my insane plans. But water cooling was the only thing I could come up with.