Mine are open no cooling. GPUs did fine last summer so we'll see how the ASICs perform. Worst case I'll offset the heat slightly with some AC but I don't ever plan to cool the room down to 60 degrees, that's just a waste of money.
100% agree, I was simply talking about the cold isle of my setup, which would only be like 20-30 sq/ft. And I was thinking 70-75F would be fine, maybe even warmer.