Experiment I found that having my fan blow air up makes the room more comfortable personally. But during the summer that doesn't do enough and I need to put in a window fan blowing air outside to get rid of the hot air inside. So experiment.
Ohh and one last thing computers don't help much in keeping the room cool. I know my computer keeps my room at least 10 degrees hotter than all the other rooms when its running and I'm gaming. Helps during the winter though