Phil, that is one monster fan! I have a big yard but I don't think I will use a fan quite that size. PJF, I use a Mac at work (and have for years) so that thought does appeal to me. Pauljs75, sounds like you have some personal experience with the heat transfer situation. I hope it didn't mess up your potential for kids! (and nope, I'm not planning to have any more. Got that behind me.)