It does not matter whthere the bong is glass or acrylic, in terms of its going to cool the smoke, Your best bet is to get an ice catcher in your bong. I personally love my ROOR, 18 in. tall, with a fat ice catcher, just load some ice, cold water, and you'll get the smoothest rips of your life, just be careful (literally) because you'll think that you didn't get that much smoke, because of how cool it is, until it expands in your lungs, and then watch out.

Peace,