El Salvador - TROPICAL climate.
Wouldn't drop the actual miner consumption much - but might drop the AIR CONDITIONING requirement a ton - which is what I think they were claiming.
If your spending that much money to cool your equipment, your not going to be competitive on the global marketplace. Yes, you could use geo-thermal cooling, but you still should only do that for your intake air, not your exhaust. If your cooling cost are anything like miner power cost, even 0.5 to 1, that is REALLY going to hurt you.