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...
I mine in -30C. I restrict my fan intake by about 30% to allow the boards to get warm, and I boot them while warming them with a hair-dryer. I use aluminum duct tape, but you could use anything that won't accidentally get sucked in.
Any thoughts on dealing with the 30C summer highs?
not a issue, fans run at full speed and you need to throw the hot air outside the mining room