Airflow to the environment is your only answer.

I rented a warehouse space with 100KW 3-phase electrical service.  In Texas.  Airflow in and out is all you need.  Filter the air and keep dust out of your units.  Still need to clean them occasionally.

Bitcoin mining is the process of turning electricity into money.  AC cooling will triple or quadruple your power bill, likely sending your costs beyond your profits.

Standalone portable AC units need to exhaust their heat somewhere, if you are exhausting this outdoors, then you can exhaust the miners outdoors.

Experiences

 - Miners slow down a bit when ambient air is 100F
 - Miners don't do well when ambient air drops below 32F because of heat stresses across the board from one end to the other.  Too much temperature gradient.