I had temp issues recently also..-
 
-35 Celsius outside and my 14x S9's struggled to keep the workshop above 40 Farenheight...some temps of units near floor level were down to low 40's also...fans down to <2500 RPM on many units.
Awesome miner on average reports temps much  higher than miner itself...

Units will often refuse to boot/ re-boot if too cold ( <55 Farenheit )
When cleaning some units....I noticed many of the aluminum cooling fins had caved in and were touching each other....I GENTLY CAREFULLY pried them apart to restore proper separation for dissipation.


I got my Jan units several weeks early also (Purched in Early Nov).....

One of my 3...  14 Theta units is a dog that can barely hold down 13.6.

Pissed I missed the last two batch sales...I was on the site with account open and plenty of BCH ready for 4 units with PSU's pre-selected and refreshing madly.......
...... but they never came available  fuuuuuuuuuuuuuuuuuuuuuuck.

did manage 1 each for previous two releases but one was EXPENSIVE!!! (So 16 by march + 4 by ?)

MINE ON