guys...you are picking nits here

moving air around has a cooling effect, especially since miners operate at temps that are generally above even the highest ambient temps...unless you happen to live in Death Valley or Aziziya

if you let the air get trapped in a building or room, the miners can quickly raise the temps to really high levels...exhaust that hot air and also bring in fresh, cooler air then you can maintain stasis

it is "cooling" even if it is not using some sort of refrigeration mechanism to do so