Keeping cages cool

I know this might seem like a silly question but believe me, it's relevant.

Last week my a/c went out. I live in Arizona, so it quickly got up in the 90's in my house. Poor Loki looked so hot and I really didn't know what I could do to keep him cool. Thankfully my mom is good friends with a guy who fixes air conditioners so he came out early in the morning and fixed it.

Does anyone have any suggestions in case this happens again?

You can keep a frozen bottle of water in your freezer, or freezer packs, so that you can just set it in the tank to cool it off. We used frozen food the last time we had to keep stuff cool.