What about the vapor? Did you check the percentage of the humidity in the cave? If there is 12°C cold and the asics are warm the moisture precipitates on the machines. So the rust will ruin the farm. What kind of solution do you have for this problem?
We have a trump card in our sleeve.
The height of the ceilings in the cave is 4 meters. We will use the old and reliable Soviet technology to cool underground mines (coal mines, mines in which minerals are produced by non-ferrous and ferrous metals).
Technology named the Canvas sleeve.
The idea is to deliver outdoor air to the end of the tunnel with a canvas sleeve (very cheap and efficient)
This creates circulation, hot air is pushed out and cool street goes even more so we have 10-12 degrees (it's always cold there)
Harmful Moisture appears at 5 Degrees, so we are in safety.