Is there a specific temperature where the Antminer S9 works more efficiently?  If electricity cost and cooling was not a factor, would it run faster or produce more running at 5c rather than 30C?

Thanks for the information.  I'm in the foothills of North Carolina.  My thoughts are that the temps will not be too hot.  Based on what I am reading, the secret is ensuring that the airflow stays constant with mild to low humidity.  I'm actually more concerned about humidity than I am about the temps as long as I can keep the airflow up.  Any additional thoughts are greatly appreciated.

I'm new to this and trying to read up and understand about the cooling and airflow needs of the Antminer S9.  Please comment on anything that you can add to this.  I've pulled these numbers together, but I would greatly appreciate someone going over them to confirm that the values and calculations are correct.   Thanks in advance!!!!!

100 Antminers

1,200 watts per Unit/Antminer
3.41 BTUs per watt
1 RT = 12000 BTU
RT = Refrigeration Ton

(Antminer * (watts * BTUs)) / RT = Refrigeration Tons

(100 * (1,200 * 3.41)) / 12000

(100 * 4,092) / 12000

409,200 / 12,000

34.1  Refrigeration Tons