If I were you, I'd plan for how are you going to remove the heat from the room.
If is one thing to blow a fan on your cards to move air, but when the room gets warmer
the whole cooling setup becomes less effective as ambient temperature raises.
Hint: Don't think A/C is a good idea. You don't want to use energy to heat air and use energy to cool air.
I asked that in the OP. So you're saying I should use something like liquid cooling?
I live in Los Angeles, so I can't just blow in cool air from outside.