If your "control system deck" is an enclosure that contains both the compressor and the roboRIO, you'll definitely want a fan to provide active cooling.
If I was building it, I'd have a
small 40mm fan on the compressor heat sink, and a larger 80 or 120mm fan on the enclosure. Make sure your exit has the same area as the opening for the fan.
You can't go wrong by having some active cooling present.