Your options for cooling are based on several factors, including whether or not you are home during the hottest part of the day, and whether you need to cool one critter/enclosure versus a whole reptile room.
If you're home when it's hot and there's only one critter then it's easier. A small battery-powered or USB fan set up to blow air over a cold pack from the freezer can push cooled air into an enclosure. You can also mist the enclosure with cold water during the hottest part of the day, or replace the water in the bowl with cold water. You should closely monitor the enclosure to ensure you're not cooling it too much.
If you have a lot of critters then there are portable air conditioners available. They sit on the floor and you run the exhaust hose out a window (stuff the rest of the window opening with a towel or blanket). We have one for the shop and used it when one of our central AC units failed, and it cooled about 800 square feet of space by 10*F compared to outside. You also have to empty the drip tray since it also dehumidifies. They cost a bit so it would probably be overkill for one room/critter.
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