You're lucky it's only 80 degrees. It won't be too long before we're in the three digits here until maybe September if we're lucky. If not, October or November.
I guess you can do things like keep them in a room with no electric appliances on. Those add heat when they're on. Making sure the windows are well sealed and no heat comes in, or cool air escapes. And keep the thermostat at the same temperature. One of the worst things to do is be turning it on and off all the time. If it's a bigger place it will take longer to cool, although not so long to heat back up, unfortunately.
_________________
"Of all God's creatures, there is only one that cannot be made slave of the leash. That one is the cat. If man could be crossed with the cat it would improve the man, but it would deteriorate the cat." - Mark Twain