Cynthia's got the idea. But I haven't had any problems keeping them between 70 and 75ish. But don't let it go any hotter. My new place doesn't have any A/C, so I might have to start getting creative. Also, if it gets cooler at night, leave your windows open. Lately, in Michigan, it's been getting into the 50's at night, so I sleep with the windows open, and close them in the morning and turn the A/C back on.
Hayley, If you can keep it at 70 steadily, then I think they'll be fine.