not much you can do to cool the room and trust me I know the feeling its been 100+ here for a few days and it gets hot in my room with only two comps running can't wait for number three
best thing to do is too get a bigger fan and make sure you get air flow.
as for the computers themselves do as omar suggested seperate them a bit to allow greater airflow around the boxes amd i'm not sure if your saying you need better hs/fans?? but if so you'll need to post your mobo info cpu types ect.
good idea omar not really practical for me but a nice idea on the ac unit. the only time its really bad in here is when i turn off the ac at night or set it so its not coming on as much. going to have to stop running those dc boxes 24/7 if this keeps up.