So it's 2,000 square feet

~3 TH per rig and you said 30 TH so 10 rigs

1.95 Kw per rig, so 20Kw is the draw

What I deduce is that you are having trouble cooling 1 rig with 200 square feet of ambient airspace per rig. What is happening? Are wires melting or are people melting. Is there hardware failure? Fire?

That is plenty of space (ambient) to maintain a temperature, unless it is closed. If it is closed then you will have issues. Again, master the airflow. spread out the rigs, make sure hot air blows one way and is directed out of the building somehow with fans, chimneys or a combo.

Mark