Heat resistant tape for hanging up posters?

I'm currently in the process of turning my attic into my new master bedroom. I currently use regular masking tape in my old bedroom to hang up posters with, but I know that in cases of extreme heat that masking tape will begin to fail and lose its stick. In my new bedroom I will not be able to afford to keep the air conditioner running when I am not home, and without air conditioner in the summer the room reaches temperatures higher than 100 degrees. What would be a good alternative to hang posters up with in a room that gets this hot? Do they make some sort of heat resistant tape that will not damage them?