General rule of thumb is that your AC unit should be at least as many watts as your rigs.
That is interesting, I have never heard of that, as far as I know, 1 watt = 3.4 btu, so if your ac is 12.000 btu then you could cool down up to 3529 watts. Anyway, I'm not against using ac, people need to calculate if is worth and this topic comes up a lot when profit is very high. When profit is low or negative nobody talks about ac ehhe because there can't be any margin of error and if there is then you are screwed --> out of business hehe