SATA Drives?
If you do, you are actually adding to the heat inside the case(in the case of the front fans) I would keep the side fane blowing the way it is. I would turn the fan around in the front to be an exhaust fan. The reason is because if you have SATA drives, they run really, really hot... And if you are blowing across them with the front intake then you are blowing that air into and across your southbridge, GPU, and then upward across your northbridge and CPU...
Try that out and report back.
Good luck, cheers.