Summer is coming, how to avoid overheated containers?

[simple]

Here in Portugal we're already getting those lovely 30C+ degrees (in Spring!) and I fear for my snails. What are some good ways to keep the terrarium fresh in this overly hot weather?

This horrible heat is not my definition of good weather 

[nar]

If you don’t air condition your home, I think the best thing to do would to be keeping them away from direct sunlight and misting them multiple times a day to keep the humidity of the tank up.

[Cashell]

Keep them out of direct sunlight and off of surfaces that absorb heat very easily.

[Liguus]

You could buy a peltier cooler and hook it up to the top of the terrarium. It basically functions like a mini air conditioner. You might want to get an additional humidifier at that point though.

Or just spray them more often and rely on evaporative cooling, and keep the soil layer thinner, or mix in more sand, so that it won't get soggy after being sprayed multiple times a day.

[snailnewb4]

I have a Kritter Keeper habitat and when we had a hot spell recently I wrapped an ice pack in a towel and leaned it against one end of the enclosure. I hoped it cooled down some, and I figured if the area on the inner side if the wall got to cool, they could always move to the other end (?)

If this sounds like a bad idea I would appreciate being corrected!