How to cool down a BP cage?

[Bogertophis]

I assume you've turned off all heating to the cage? Personally I'd use frozen water bottles (or the re-freezable things they use in ice chests), but just put them inside something so your snake isn't in direct contact, & then at one end of the enclosure, so your snake can get close or stay distant. I'm saying "bottles" plural, but you might only need one- you'll have to experiment some to see what you need.

**I've only done this with heat, when an ice storm put out my power for days: I put my snakes in cloth bags & then into ice chests with large jars filled with very hot tap water for heat, & even in my cold house (it got down to 45*) they stayed a balmy 78-80* with me changing the water about every 8-9 hours.

The one drawback of cold water bottles is that they'll have condensation (drips of water) but hey, good for humidity. Remember that heat rises & cold sinks, so you might actually be able to put the cold bottles on top of the enclosure- but that probably won't be as effective as inside. Anyway, I assume that "40* C" is what the outside temperature is going to be- it shouldn't be quite that hot indoors-?

**And btw, it's easier to cool a smaller space, so you could do the same thing for emergency cooling: bag your snake, then put him in an ice chest with a bottle of COLD water- not iced, & open it every now & then for fresh air. Monitor the temps too, obviously. My snakes were completely unfazed by the 4 days they spent in bags during that ice storm, & I've also moved across country with snakes bagged & protected by being in an insulated chest.

Do you have a good sized fan? If you keep it blowing on a damp towel, that will cool the room down- unless it's real humid where you live, then it won't help. That's how "swamp coolers" (aka evaporative coolers) work in the desert- only they use pads, not towels- but water drips thru the pad & the fan pulls air in across them, making it cool. I'm sure you can find a way to fake this.